CN107560709B

CN107560709B - A kind of vibration amplitude measurement method and measuring device

Info

Publication number: CN107560709B
Application number: CN201710685487.5A
Authority: CN
Inventors: 周瑜; 王志远
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2019-10-18
Anticipated expiration: 2037-08-11
Also published as: CN107560709A

Abstract

The embodiment of the present invention provides a kind of vibration amplitude measurement method and measuring device, this method can include: project grating fringe respectively from target projection point to reference planes and target membrane；There are the reference planes of grating fringe and target membrane to shoot respectively projection from target shooting point, to obtain reference grating stripe pattern and target gratings strips print image；According to the target gratings strips print image, the corresponding target striped of each target point in target membrane is determined, and obtain reference position information of each target striped in reference grating stripe pattern；According to the location information and reference position information of target projection point, target shooting point, reference planes and the target membrane to remain static, target membrane is calculated in the amplitude of each target point.The embodiment of the present invention can go out the amplitude of the target point in a face in target membrane with one-shot measurement, so as to reduce measurement duration, promote measurement efficiency.

Description

A kind of vibration amplitude measurement method and measuring device

Technical field

The present invention relates to field of communication technology more particularly to a kind of vibration amplitude measurement methods and measuring device.

Background technique

With the development of mobile internet, electronic product is increasingly by the favor of user, and most of electronic product is all Need to use loudspeaker, loudspeaker principle of sound is to convert electrical signals to acoustical signal by the vibration of diaphragm, it is seen then that loudspeaker The vibration characteristics of diaphragm plays a crucial role the sounding of loudspeaker.In consideration of it, needing the vibration to speaker diaphragm Width measures.Currently, the prior art mainly uses single point laser mensuration to measure the amplitude of speaker diaphragm, it should Method requires a great deal of time due to needing to take multiple measurements speaker diaphragm.As it can be seen that existing vibration amplitude measurement method There is a problem of time-consuming excessive.

Summary of the invention

The embodiment of the present invention provides a kind of vibration amplitude measurement method and measuring device, exists to solve existing vibration amplitude measurement method Time-consuming excessive problem.

In order to solve the above-mentioned technical problem, the present invention is implemented as follows: a kind of vibration amplitude measurement method, is used to measure a mesh Mark the amplitude of diaphragm, which comprises

Project grating fringe respectively from target projection point to reference planes and target membrane, wherein the reference planes with Plane where the target membrane to remain static is parallel；

There are the reference planes of the grating fringe and the target membrane to carry out respectively projection from target shooting point Shooting, to obtain reference grating stripe pattern and target gratings strips print image；

According to the target gratings strips print image, the corresponding target of each target point in the target membrane is determined Striped, and obtain reference position information of each target striped in the reference grating stripe pattern；

According to the target projection point, the target shooting point, the reference planes and the mesh to remain static The location information of mark diaphragm and the reference position information, calculate the target membrane in the amplitude of each target point.

The embodiment of the present invention also provides a kind of measuring device, for measuring the amplitude of a target membrane, the measuring device Include:

Projection module, for projecting grating fringe respectively from target projection point to reference planes and target membrane, wherein institute It is parallel with the plane where the target membrane to remain static to state reference planes；

Shooting module, for having the reference planes and the target of the grating fringe to projection from target shooting point Diaphragm is shot respectively, to obtain reference grating stripe pattern and target gratings strips print image；

Determining module, for determining each target point in the target membrane according to the target gratings strips print image Corresponding target striped, and obtain reference position information of each target striped in the reference grating stripe pattern；

Computing module is used for according to the target projection point, the target shooting point, the reference planes and is in static The location information of the target membrane of state and the reference position information, calculate the target membrane in each target The amplitude of point.

In the embodiment of the present invention, by projection there are the reference planes of grating fringe and target membrane to be shot respectively come Reference grating stripe pattern and target gratings strips print image are obtained, and according to the reference grating stripe pattern and the target light Grizzly bar print image calculates the amplitude of the target point in a face in the target membrane, in this way, the vibration amplitude measurement method is not necessarily to Each target point in the target membrane is measured respectively, measurement duration is reduced so as to reach, promotes measurement effect The purpose of rate.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention Example is applied, it for those of ordinary skill in the art, without any creative labor, can also be attached according to these Figure obtains other attached drawings.

Fig. 1 is a kind of flow diagram of vibration amplitude measurement method provided in an embodiment of the present invention；

Fig. 2 is a kind of reference grating stripe pattern schematic diagram provided in an embodiment of the present invention；

Fig. 3 is a kind of target gratings strips print image schematic diagram provided in an embodiment of the present invention；

Fig. 4 is a kind of calculating reference model schematic diagram provided in an embodiment of the present invention；

Fig. 5 is the flow diagram of another vibration amplitude measurement method provided in an embodiment of the present invention；

Fig. 6 is the flow diagram of another vibration amplitude measurement method provided in an embodiment of the present invention；

Fig. 7 is a kind of structural schematic diagram of measuring system provided in an embodiment of the present invention；

Fig. 8 is a kind of structural schematic diagram of measuring device provided in an embodiment of the present invention；

Fig. 9 is the structural schematic diagram of another measuring device provided in an embodiment of the present invention；

Figure 10 is the structural schematic diagram of another measuring device provided in an embodiment of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts Example, shall fall within the protection scope of the present invention.

Referring to Fig. 1, Fig. 1 is a kind of flow diagram of vibration amplitude measurement method provided in an embodiment of the present invention, for surveying The amplitude of a target membrane is measured, as shown in Figure 1, the described method comprises the following steps:

Step 101 projects grating fringe from target projection point to reference planes and target membrane respectively, wherein the ginseng It is parallel with the plane where the target membrane to remain static to examine plane.

Above-mentioned target membrane is the object for needing to measure in the embodiment of the present invention, can be the diaphragm in audible device, Such as the diaphragm on loudspeaker, and loudspeaker mainly converts electrical signals into voice signal using the vibration of diaphragm, therefore, diaphragm Vibration characteristics it is particularly important for the sounding quality of loudspeaker, in the embodiment of the present invention, by diaphragm carry out amplitude measurement, To obtain the vibration characteristics of diaphragm.

Above-mentioned reference planes are parallel with the plane where the target membrane to remain static, if the target membrane On a horizontal plane, then the reference planes can be located at the target membrane above or below, or with the target film Piece is located in same level, and effect mainly provides reference bit confidence to calculate the amplitude of each point in the target membrane Breath.

Above-mentioned grating fringe can be by rastering laser projector projected from above-mentioned target projection point it is chequered with black and white Striped, wherein the target projection point can be understood as projecting the position where the camera lens of the equipment of the grating fringe.

It is above-mentioned to project grating fringe respectively from target projection point to reference planes and target membrane, it can be by the grating Laser-projector first projects the grating fringe to the reference planes from the target projection point, then throws to the target membrane Penetrate the grating fringe, wherein if the reference planes are located at the top of the target membrane, throw to the target membrane It penetrates before the grating fringe, can first remove the reference planes, if the reference planes are located at the target membrane Lower section, or be located at approximately the same plane with the target membrane, then it, can before projecting the grating fringe to the reference planes First the target membrane to be removed.

In the step, by projecting grating fringe respectively from target projection point to reference planes and target membrane, institute can be made It states to reflect in reference planes and the target membrane and has grating fringe, so as to pass through the light reflected in the target membrane Grizzly bar line confirms the position of each target point in the target membrane, and the grating by reflecting in the reference planes Striped come confirm each target point correspond to the reference planes on reference stripe position.

Step 102, the reference planes and the target membrane for having the grating fringe to projection from target shooting point It is shot respectively, to obtain reference grating stripe pattern and target gratings strips print image.

Above-mentioned reference grating stripe pattern and target gratings strips print image can be by photographing device (such as video camera) from upper Stating target shooting point has the reference planes of the grating fringe and the target membrane to be shot to obtain respectively projection Two amplitude grating stripe patterns.Wherein, the striped in the reference grating stripe pattern is vertical bar line, and by the target membrane Vibration influence, the striped corresponded in the target membrane in the target gratings strips print image is sinuate modified strip Line, such as: it is wherein reference grating stripe pattern schematic diagram in Fig. 2 as shown in Figures 2 and 3, Fig. 3 is target grating fringe figure As schematic diagram.Further, since the target membrane be vibrated with certain frequency, therefore the photographing device can use it is higher Frame per second, to take relatively clear target gratings strips print image, to guarantee the accuracy of measurement data.

The target shooting point can be understood as the bat shot respectively to the reference planes and the target membrane According to the position where the camera lens of equipment.The above-mentioned reference planes and the institute for having the grating fringe to projection from target shooting point It states target membrane to be shot respectively, can be after optical grating projection instrument projects grating fringe to the reference planes, by imaging Machine shoots the reference planes from the target shooting point, to obtain the reference grating stripe pattern, then in light Grid projector to the target membrane project grating fringe after, by video camera from the target shooting point to the target membrane into Row shooting, to obtain the target gratings strips print image.

In the step, by having the reference planes and the target of the grating fringe to projection from target shooting point Diaphragm is shot respectively, available reference grating stripe pattern and target gratings strips print image, so as to by described Target gratings strips print image is determined to determine the target point in the target membrane by the reference grating stripe pattern The position of the corresponding reference stripe of target point in the target membrane.

Step 103, according to the target gratings strips print image, determine that each target point in the target membrane is right respectively The target striped answered, and obtain reference position information of each target striped in the reference grating stripe pattern.

Each target point in above-mentioned target membrane can be point that vibrational state is in the target membrane, above-mentioned According to the target gratings strips print image, the corresponding target striped of each target point in the target membrane is determined, it can be with It is the target area that deforming stripe is locked from the target gratings strips print image, then according to each target point in the target Position and the target area on diaphragm determine that each target point corresponds to phase in the target gratings strips print image Striped where the point is finally determined as target striped corresponding to respective objects point by the position that should be put.

Reference position information of the above-mentioned each target striped of acquisition in the reference grating stripe pattern, can be according to institute State each target striped in target gratings strips print image, determine in the reference grating stripe pattern respectively with each target striped pair The reference stripe answered, and using the location information of each reference stripe as the reference position information.In particular it is required that according to described The quantity of striped in reference grating stripe pattern and the target gratings strips print image, tentatively judges this two amplitude gratings stripe pattern The corresponding relationship of middle striped, if institute's grating fringe cover the target membrane it is consistent with the range of the reference planes when, and clap The reference grating stripe pattern taken the photograph is consistent with the striped quantity in the target gratings strips print image, then can be direct It is corresponding with each target striped with reference to item respectively in the ginseng grating fringe image to determine than opposite two amplitude grating stripe patterns Line；If the reference grating stripe pattern and the striped quantity in the target gratings strips print image are inconsistent, can basis Distance of the reference planes away from the target membrane, extrapolate in the reference grating stripe pattern with the target gratings strips The wherein corresponding striped of a stripe in print image, so can determine in the ginseng grating fringe image respectively with each target The corresponding reference stripe of striped.

In this way, in the step, by the corresponding target striped of each target point in the determination target membrane, and Reference position information of each target striped in the reference grating stripe pattern is obtained, can be determined in the target membrane Location information of each target point in the target gratings strips print image, and in the reference grating stripe pattern respectively The reference position information of reference stripe corresponding with each target point, so as to determine the mesh according to the two location informations Each target point on diaphragm is marked in vibration in the offset in the direction x, wherein the direction x is vertical with grating fringe Direction, as shown in the arrow direction in Fig. 2.

Step 104 according to the target projection point, the target shooting point, the reference planes and remains static The target membrane location information and the reference position information, calculate the target membrane in each target point Amplitude.

In the step, if the plane where the reference planes and the target membrane to remain static is level Face, according to the location information of the target projection point and the target shooting point, can determine the target projection point with it is described The horizontal distance d of target shooting point, according to the reference planes and the location information of the target membrane to remain static, Can determine the vertical range s of the reference planes Yu the target membrane, further, it is also possible to determine the target projection point with The vertical range l of the reference planes.In this way, according to parameter d, s and l and each target point in the target grating fringe Co-ordinate position information x in image in the horizontal direction₁With the reference bit confidence in the grating fringe image in the horizontal direction Cease x₂, the target membrane can be calculated in the amplitude of each target point.

Specifically, the target can be determined by the location information of the target projection point and the target shooting point The horizontal distance reference baseline of subpoint and the target shooting point, and determine some object to be measured point to the reference baseline Distance determines the corresponding throw light of the target point, and root further according to the location information of the target point and target projection point The location information for determining reference point through the point in the reference planes according to the throw light, may thereby determine that the reference point to institute State the distance of reference baseline.Then each point is connected with line segment, and the corresponding calculating reference model of foundation (such as: such as Fig. 4 institute Show), Similar Principle of Triangle is recycled, such as: according to similar principle (the two triangles of triangle BPE and BP'F in Fig. 4 The ratio of two right angle side lengths of shape is equal) or the similar principle of the triangle BCP' and PGP' (bottom edge of the two triangles It is equal with high ratio), available calculation formula relevant to the amplitude of the target point is believed finally by each parameter is substituted into Breath, can calculate the amplitude of the target point.

In this way, by the target projection point, the target shooting point, the reference planes and being in quiet in the step The only location information of the target membrane of state and the reference position information, can calculate the target membrane at certain The amplitude of a target point, it is all positioned at institute in the target gratings strips print image so as to calculate according to same principle State the amplitude of the target point in target membrane.Each target in the target membrane is clicked through respectively in compared with the prior art Row independent measurement and calculating, this method can once calculate the amplitude information in a face in the target membrane, even institute The amplitude information of entire surface in target membrane is stated, so that largely Shangdi reduces measurement duration, greatly improves survey Amount efficiency, and the amplitude data for each point being calculated is influenced due to not measured difference by front and back, the precision of measurement data Obtain certain promotion.

It should be noted that step 103 and step 104 can be by the rear ends in high-speed camera in the embodiment of the present invention Chip is completed, and is also possible to the target gratings strips print image and the reference grating stripe pattern and the target Subpoint, the target shooting point, the location information of the reference planes and the target membrane to remain static are all defeated Enter in intelligence computation system (such as computer), step 103 and step 104 are realized by intelligence computation system.

Referring to Fig. 5, Fig. 5 is the flow diagram of another vibration amplitude measurement method provided in an embodiment of the present invention, it is used for Measure the amplitude of a target membrane.On the basis of embodiment embodiment shown in Fig. 1, to it is described from target shooting point to throwing The step of reference planes and the target membrane for penetrating the grating fringe are shot respectively is refined, and right The mode of calculated amplitude has carried out corresponding refinement.As shown in figure 5, the described method comprises the following steps:

Step 501 projects grating fringe to reference planes and target membrane from target projection point with first angle respectively, In, the reference planes are parallel with the plane where the target membrane to remain static.

First angle described above can be understood as projecting direction and the institute of the court, camera lens institute of the equipment of the grating fringe The angle of plane where stating reference planes or the target membrane that remains static, wherein the first angle is can With what is be adjusted in advance, to guarantee that the grating fringe projected from the target projection point with the first angle can be with It projects in the reference planes and the target membrane, or even allows the grating fringe that the target film is completely covered Piece goes out the amplitude of more multiple target points in the target membrane, the vibration of even all target points so as to one-shot measurement Width.

It is above-mentioned that the specific of grating fringe is projected to reference planes and target membrane with first angle respectively from target projection point Embodiment may refer to the related embodiment of step 101 in embodiment of the method shown in FIG. 1, to avoid repeating, here not It repeats again.

Optionally, the of same size and spacing of every stripe is equal in the grating fringe.

In the embodiment, in the grating fringe that is projected in the reference planes and the target membrane, every stripe Width can identical and spacing it is equal, wherein the width value of every stripe can by optical grating projection instrument according to measurement needed for What precision was regulated and controled.Such as: in the embodiment of the present invention, the required precision that can be measured according to the target membrane will be described The width adjustment of every stripe is to preset value in grating fringe, so as to meet the required precision of measurement data.

It should be noted that the embodiment can also embodiment as shown in connection with fig. 1 implement.

Optionally, the area of the reference planes is greater than the area of the target membrane.

In the embodiment, the area of the reference planes can be greater than the area of the target membrane, in this way, when described When the target membrane is completely covered in grating fringe, the every grating fringe reflected in the target membrane can be described Corresponding reference grating striped is found in reference planes, so as to calculate the amplitude of entire surface in the target membrane.

Step 502 has the reference planes of the grating fringe to carry out projection from target shooting point with second angle Shooting, to obtain reference grating stripe pattern.

Above-mentioned second angle can be understood as taking pictures to what the reference planes and the target membrane were shot respectively The folder of plane where the direction of the court, camera lens institute of equipment and the reference planes or the target membrane to remain static Angle, wherein the second angle can be adjusted in advance, to guarantee from the target shooting point with the second angle The reference planes that projection has the grating fringe can be taken, to obtain reference grating stripe pattern, it might even be possible to Keep the striped quantity in the reference grating stripe pattern as more as possible and clear-cut texture.

In the step, there is the reference of the grating fringe to projection with the second angle from the target shooting point Plane is shot, available reference grating stripe pattern, and specific embodiment may refer to method shown in FIG. 1 and implement Related embodiment described in step 102 in example, to avoid repeating, which is not described herein again.

Step 503 has the grating fringe to projection with the second angle and preset frame rate from the target shooting point The target membrane be continuously shot, to obtain the coherent target gratings strips print image of several frames, wherein the default frame Rate is matched with the vibration frequency of the target membrane.

The above-mentioned institute for having the grating fringe to projection with the second angle and preset frame rate from the target shooting point It states target membrane to be continuously shot, can be photographing device (such as video camera) using the vibration frequency with the target membrane The frame per second matched simultaneously is continuously shot the target membrane from the target shooting point with the second angle, if to obtain The coherent target gratings strips print image of dry frame.Wherein, described be continuously shot can be understood as carrying out video to the target membrane Shooting, the preset frame rate are matched with the vibration frequency of the target membrane, it can be understood as the bat that the photographing device uses Taking the photograph frame per second is according to the vibration frequency of the target membrane come preset, specifically, the shooting frame rate that the photographing device uses It can be 2 times of the vibration frequency of at least described target membrane.

Such as: when the target membrane is speaker diaphragm, vibration frequency is about 20000 hertz, i.e., the described loudspeaking Vibration in device diaphragm every 0.00005 second is primary, and can use frame per second at this time is 40000 frames high-speed camera per second to the loudspeaking Device diaphragm is shot, i.e., described every 0.000025 second beats of high-speed camera takes the photograph a frame picture, in this way, the high-speed camera exists Two frame pictures can be taken in 0.00005 second, and the mesh of the loud-speaker diaphragm on piece can be calculated by this two frames picture For punctuate in primary vibration, amplitude and vibration when the top of original position is arrived in vibration arrive the amplitude when lower section of original position.

It should be noted that after shooting and obtaining the target gratings strips print image that several frames link up, if can be by described in The coherent target gratings strips print image of dry frame is exported according to certain refreshing frequency, obtains the vibration view of the target membrane Frequency image, so as to intuitively observe the vibrational state of the target membrane by the vibration video image.

In the step, by using with the matched preset frame rate of the vibration frequency of the target membrane to the target membrane It is shot, the coherent target gratings strips print image of several frames, and the target grating to link up according to several frames can be obtained Stripe pattern can obtain the target point in the target membrane in the amplitude of multiple positions, so as to reflect by calculating Vibrational state of the target point in the target membrane in different moments out.

Optionally, the second angle is 90 degree.

In the embodiment, the second angle can be 90 degree, i.e. reference planes described in the camera lens face of photographing device It is shot with the target membrane, in this way, it is all equidistant for being shot every stripe in obtained reference grating stripe pattern Arrangement, so as to play good reference role, and the complicated journey that target membrane amplitude is calculated in subsequent step can be reduced Degree, and improve the precision of measurement.

Step 504 determines that each target point in the target membrane corresponds respectively to every frame target gratings strips print image In target striped, and obtain each target striped in every frame target gratings strips print image respectively in the reference grating bar graph Reference position information as in.

It, can be one by one for the target gratings strips print image that several frames shot in step 503 link up in the step Determine the target striped that each target point in the target membrane corresponds respectively in every frame target gratings strips print image, and Reference position of each target striped in every frame target gratings strips print image in the reference grating stripe pattern is obtained respectively Information may thereby determine that position letter of each target point in the target membrane in every frame target gratings strips print image Breath, and in the reference grating stripe pattern reference stripe corresponding with each target point reference position information, So as to determine each target point in the target membrane in every frame target grating fringe figure according to the two location informations In the offset in the direction x as in.

It should be noted that determining that each target point in the target membrane corresponds respectively to each frame in the step Each target striped in target striped in target gratings strips print image, and each frame target gratings strips print image of acquisition is described Step 103 in the specific embodiment and embodiment of the method shown in FIG. 1 of reference position information in reference grating stripe pattern Embodiment it is similar, to avoid repeating, which is not described herein again.

Step 505 according to the target projection point, the target shooting point, the reference planes and remains static The target membrane location information and each target striped in every frame target gratings strips print image in the reference grating Reference position information in stripe pattern calculates separately target membrane described in every frame target gratings strips print image in each target The amplitude of point.

In the step, each target striped in every frame target gratings strips print image that need to be determined according to step 504 is described Reference position information in reference grating stripe pattern calculates separately target membrane described in every frame target gratings strips print image and exists The amplitude of each target point, in this way, since every frame target gratings strips print image each of reflects in the target membrane respectively Therefore amplitude of the target point when vibrating to different location different moments in the step, passes through and calculates every frame target grating fringe Target membrane described in image is in the amplitude of each target point, and each target point in the available target membrane is in difference The vibrational state at moment, so as to comprehensively obtain the vibration characteristics of the target membrane.

It should be noted that calculating target membrane described in every frame target gratings strips print image in each mesh in the step The specific embodiment of the amplitude of punctuate is similar with the embodiment of step 104 in embodiment of the method shown in FIG. 1, to avoid weight Multiple, which is not described herein again.

Optionally, the target projection point and the target shooting point are located on same target level line, the target water Horizontal line is parallel with the reference planes.

In the embodiment, it is located at the target projection point and the target shooting point on same target level line, and The target level line is parallel with the reference planes, in this way, according to the position of the target projection point and the target shooting point Confidence breath, the linear distance that can directly determine the two is the horizontal distance of the target projection point and the target shooting point D, and the distance between the reference planes and the target level line are the target projection point to the reference planes Vertical range l.Further, since the target projection point and the target shooting point are located on same target level line, calculating The target membrane can simplify calculating reference model in the amplitude of target point, so as to reduce the complexity of calculating.

Optionally, the vertical range of the reference planes and the target membrane to remain static is more than or equal to The peak swing of the target membrane.

In the embodiment, the vertical range s of the reference planes and the target membrane to remain static is greater than Or the peak swing equal to the target membrane, this way it is possible to avoid when the reference planes are located at the target membrane Above or below when, the amplitude of target point exceeds the reference planes and the target membrane distance s in the target membrane, So as to cause when establishing calculating reference model and calculating the amplitude of some target point, point situation is needed to calculate the vibration of the point Width is positioned at the top of the reference planes or positioned at the lower section of the reference planes, to carry out phase according to the target point It calculates with answering.Therefore, in the embodiment, it is more than or equal to distance of the reference planes away from the target membrane described The peak swing of target membrane, to reduce the complexity of calculating to a certain extent, so as to more rapidly and accurately obtain The target membrane is obtained in the amplitude of each target point.

It should be noted that the peak swing of the target membrane generally can be substantially true according to the application scenarios of diaphragm It is fixed, such as: the Oscillation Amplitude of speaker diaphragm can will join generally in 5cm or so, therefore when measuring the amplitude of speaker diaphragm Examining plane and being located at the distance away from speaker diaphragm is 5.5cm place.

It should be noted that in the embodiment of the present invention, the target projection point can be at a distance from the target shooting point It is in the first preset range and as small as possible, to guarantee that measurement data reaches higher precision, the target membrane and the mesh The distance of subpoint is marked in the second preset range, so that the grating fringe can cover the target membrane, the target Diaphragm with and target projection point at a distance from third preset range so that photographing device can take the target film On piece projection all grating fringes, the reference planes at a distance from the target membrane within the scope of the 4th pre-determined distance, So that the reference grating stripe pattern is consistent with the striped quantity in the target gratings strips print image, in this way, not only can be with Guarantee that once shooting the obtained target gratings strips print image can reflect out the amplitude letter of entire surface in the target membrane Breath, moreover it is possible to simplify calculating process, improve the precision of measurement data.

In the present embodiment, there is the light to projection from target shooting point to described on the basis of embodiment shown in Fig. 1 The step of reference planes and the target membrane of grizzly bar line are shot respectively is refined, and to calculated amplitude Mode has carried out corresponding refinement, it is hereby achieved that amplitude of the target point in the target membrane at multiple moment.In addition, this The embodiment of plurality of optional is also added on the basis of embodiment embodiment shown in Fig. 1, these optional embodiments Can be combined with each other realization, can also be implemented separately, and be attained by reduction measurement duration, promote the technology effect of measurement efficiency Fruit.

Referring to Fig. 6, Fig. 6 is the flow diagram of another vibration amplitude measurement method provided in an embodiment of the present invention, it is used for Measure the amplitude of a target membrane.On the basis of embodiment embodiment shown in Fig. 1, to how calculating the target membrane It is refined in the mode of the amplitude of each target point.As shown in fig. 6, the described method comprises the following steps:

Step 601 projects grating fringe from target projection point to reference planes and target membrane respectively, wherein the ginseng It is parallel with the plane where the target membrane to remain static to examine plane.

The specific embodiment of the step may refer to the embodiment of step 101 in embodiment of the method shown in FIG. 1, be It avoids repeating, which is not described herein again.

Step 602, the reference planes and the target membrane for having the grating fringe to projection from target shooting point It is shot respectively, to obtain reference grating stripe pattern and target gratings strips print image.

The specific embodiment of the step may refer to the embodiment of step 102 in embodiment of the method shown in FIG. 1, be It avoids repeating, which is not described herein again.

Step 603, according to the target gratings strips print image, determine that each target point in the target membrane is right respectively The target striped answered, and obtain reference position information of each target striped in the reference grating stripe pattern.

The specific embodiment of the step may refer to the embodiment of step 103 in embodiment of the method shown in FIG. 1, be It avoids repeating, which is not described herein again.

Optionally, described according to the target gratings strips print image, determine each target point point in the target membrane Not corresponding target striped, and obtain the step of reference position information of each target striped in the reference grating stripe pattern Suddenly, comprising:

The serial number of every stripe and the reference light grizzly bar in the target gratings strips print image are determined by preset order The serial number of every stripe in print image, and establish the striped in the target gratings strips print image and the reference grating bar graph The serial number corresponding relationship of striped as in；

Determine each mesh that each target point in the target membrane corresponds respectively in the target gratings strips print image Mark the serial number of striped；

According to the serial number corresponding relationship, determine in the reference grating stripe pattern serial number respectively with each target striped The reference stripe of order number matches；

Obtain reference position information of each reference stripe in the reference grating stripe pattern.

Above-mentioned preset order, which can be, presets a sequence according to the arrangement mode of the grating fringe, such as: it please refers to Fig. 7, after the orientation target membrane 703 of rastering laser projector 701 as shown in Figure 7 projects grating fringe, the target membrane The arrangement mode of the grating fringe of upper reflection is left-right situs, and therefore, the preset order can be from left to right suitable Sequence or sequence from right to left.

The above-mentioned serial number that every stripe in the target gratings strips print image is determined by preset order, can be by described pre- If sequence carries out serial number label to every stripe in the target gratings strips print image, to obtain the target grating fringe The serial number of every stripe in image, such as: every stripe in target gratings strips print image shown in Fig. 3 is pressed from left to right Sequence carries out serial number label, in available target gratings strips print image shown in Fig. 3 the serial number of every black streaking press from a left side to Right sequence is followed successively by 1,2,3,4,5,6,7 and 8.

In addition, also needing the serial number for determining every stripe in the reference grating stripe pattern by same preset order, example Such as: every stripe in reference grating stripe pattern shown in Fig. 2 being subjected to serial number label by sequence from left to right, can be obtained Into reference grating stripe pattern shown in Fig. 2 the serial number of every black streaking by sequence be from left to right followed successively by 1,2,3,4,5, 6,7 and 8.

It is above-mentioned to establish the striped in the target gratings strips print image and the striped in the reference grating stripe pattern Serial number corresponding relationship can be the distance first according to the reference planes away from the target membrane, extrapolate the reference grating Reference data striped corresponding with the reference stripe in the target gratings strips print image, then obtains the mesh in stripe pattern Reference data striped described in the serial number of reference stripe described in mark grating fringe image and the reference grating stripe pattern Serial number, and the serial number corresponding relationship of this two stripe is established, finally, can be by other in the target gratings strips print image Line refers to base relative to described relative to other stripeds in the position of the reference stripe and the reference grating stripe pattern Corresponding serial number corresponding relationship is established in the position of floating screed line.

Such as: if the grating fringe cover the target membrane it is consistent with the range of the reference planes when, and shoot The obtained reference grating stripe pattern is consistent with the striped quantity in the target gratings strips print image, may refer at this time Fig. 2 and Fig. 3, wherein the serial number of every black streaking presses sequence from left to right successively in reference grating stripe pattern shown in Fig. 2 It is 1,2,3,4,5,6,7 and 8, the serial number of every black streaking is suitable by from left to right in target gratings strips print image shown in Fig. 3 Sequence is followed successively by 1,2,3,4,5,6,7 and 8, in this way, the serial number corresponding relationship established is serial number in the target gratings strips print image The black streaking of serial number 1 in the reference grating stripe pattern, sequence in the target gratings strips print image are corresponded to for 1 black streaking Number correspond to the black streaking of serial number 2 in the reference grating stripe pattern, the corresponding pass of other several stripes for 2 black streaking It is similar, i.e., identical one a pair of striped of serial number in the described target gratings strips print image and the reference grating stripe pattern It answers.

Each target point in the above-mentioned determination target membrane corresponds respectively in the target gratings strips print image The serial number of each target striped can be each target point first determined in the target membrane and correspond respectively to the target grating Each target striped in stripe pattern is obtained further according to the serial number of every stripe in the fixed target gratings strips print image Take the serial number of each target striped.

It is above-mentioned according to the serial number corresponding relationship, determine in the reference grating stripe pattern serial number respectively with each target item The reference stripe of the order number matches of line can be and search the sequence with each target striped respectively from established serial number corresponding relationship Number matched reference number, then finds corresponding reference stripe according to the reference number.

Reference position information of the above-mentioned each reference stripe of acquisition in the reference grating stripe pattern, can be in determination Serial number is respectively and after the reference stripe of the order number matches of each target striped in the reference grating stripe pattern, by each reference stripe Location information in the reference grating stripe pattern is respectively as the corresponding reference position information of respective objects point.

In this way, passing through the striped established in the target gratings strips print image and the reference grating in the embodiment The serial number corresponding relationship of striped in stripe pattern can rapidly and accurately determine reference stripe corresponding with each target striped, And then it can rapidly and accurately obtain the corresponding reference position information of each target point in the target membrane.

Step 604 passes through formula A=l-l (d-x₁)/(d-x₂)-s calculates the target membrane in the vibration of each target point Width；

Wherein, d indicates the horizontal distance of the target projection point and the target shooting point, and l indicates the target projection Point and the vertical ranges of the reference planes, s indicate the vertical of the reference planes and the target membrane that remains static Straight distance, x₁Indicate some target point in the target gratings strips print image in the coordinate value of x-axis direction, x₂It indicates and the mesh For the corresponding target striped of punctuate in the coordinate value of the x-axis direction in the reference grating stripe pattern, A indicates the target Amplitude of the diaphragm in the target point.

In the step, pass through formula A=l-l (d-x₁)/(d-x₂)-s calculates the target membrane in each target point Amplitude, wherein s indicates the vertical range of the reference planes with the target membrane to remain static, and can be with just Negative indicates the orientation of the reference planes Yu the target membrane, such as: as shown in figure 4, if the target membrane is located at The top of the reference planes, s is indicated with positive number at this time, if the opposite target membrane is located at the lower section of the reference planes, S negative number representation at this time, if the reference planes and the target membrane are located at approximately the same plane, s is zero at this time.

It should be noted that the calculated result of A has just and has negative, indicate the target membrane in the vibration side of some target point To for upward or downward, such as: the target projection point, the target shooting point, the target membrane and the reference planes Position as shown in figure 4, if calculated result A is positive, then it represents that the target membrane is vibrated upwards, if calculated result A is negative, Indicate that the target membrane is vibrated downwards in some target point.

Below in conjunction with Fig. 4 and Fig. 7, the calculation method to the target membrane in the amplitude of each target point is illustrated Explanation, wherein Fig. 4 is the position according to rastering laser projector 701 shown in fig. 7, video camera 702 and target membrane 703 The calculating reference model that relationship obtains, the target membrane 703 are located at the rastering laser projector 701 and the high-speed camera The lower section of machine 702.

As shown in figure 4, the reference planes are located at the lower section of the target membrane, the target projection point B and the mesh The horizontal distance for marking shooting point C is d, and the reference planes N is with the plane M's where the target membrane to remain static Vertical range is s, and the vertical range of the target projection point B and the reference planes N are l, wherein with x-axis shown in figure, Y-axis, z-axis and origin O constitute reference frame.

If the target point in the target membrane is P, then the point that the point corresponds in the reference planes is P', according to three The angular principle of similitude, i.e. triangle BPE are similar with BP'F, it is known that

Due to

EC=x₁, FC=x₂

Therefore it can obtain

Wherein, x₁Indicate P point in the target gratings strips print image in the coordinate value of x-axis direction, x₂Indicate that P point is corresponding Target striped in the reference grating stripe pattern in the coordinate value of the x-axis direction, A indicates the target membrane in P The amplitude of point.

In this way, passing through formula A=l-l (d-x in the step₁)/(d-x₂)-s, it can rapidly calculate the target film Piece P point amplitude, so as to according to same principle, rapidly calculate all positions in the target gratings strips print image In the amplitude of the point in the target membrane.

In the present embodiment, to how calculating the target membrane in each target on the basis of embodiment shown in Fig. 1 The mode of the amplitude of point is refined, to keep the target membrane clearer in the calculation of the amplitude of each target point It is illustrated.In addition, also adding the embodiment of plurality of optional on the basis of the present embodiment embodiment shown in Fig. 1, these can The embodiment of choosing can be combined with each other realization, can also be implemented separately, and be attained by reduction measurement duration, promote measurement effect The technical effect of rate.

Referring to Fig. 8, Fig. 8 is the structural schematic diagram that the present invention implements a kind of measuring device provided, for measuring a mesh The amplitude for marking diaphragm, as shown in figure 8, measuring device 800 includes:

Projection module 801, for projecting grating fringe respectively from target projection point to reference planes and target membrane, In, the reference planes are parallel with the plane where the target membrane to remain static；

Shooting module 802, for having the reference planes of the grating fringe and described to projection from target shooting point Target membrane is shot respectively, to obtain reference grating stripe pattern and target gratings strips print image；

Determining module 803, for determining each target in the target membrane according to the target gratings strips print image The corresponding target striped of point, and obtain reference position information of each target striped in the reference grating stripe pattern；

Computing module 804, for according to the target projection point, the target shooting point, the reference planes and being in The location information of the target membrane of stationary state and the reference position information, calculate the target membrane each The amplitude of target point.

Optionally, the projection module 801 is used for from target projection point with first angle to reference planes and target membrane Grating fringe is projected respectively；

As shown in figure 9, the shooting module 802 includes:

First shooting unit 8021, for there is the institute of the grating fringe with second angle projection from the target shooting point Reference planes are stated to be shot；

Second shooting unit 8022, for having from the target shooting point with the second angle and preset frame rate to projection The target membrane of the grating fringe is continuously shot, to obtain the coherent target gratings strips print image of several frames, In, the preset frame rate is matched with the vibration frequency of the target membrane；

The determining module 803 is for determining that each target point in the target membrane corresponds respectively to every frame target light Target striped in grizzly bar print image, and each target striped in every frame target gratings strips print image is obtained respectively in the reference Reference position information in grating fringe image；

The computing module 804 is used for according to the target projection point, the target shooting point, the reference planes and place Each target striped in the location information and every frame target gratings strips print image of the target membrane of stationary state is in phase The reference position information in reference grating stripe pattern answered calculates separately target film described in every frame target gratings strips print image Amplitude of the piece in each target point.

Optionally, the computing module 804 is used to pass through formula A=l-l (d-x₁)/(d-x₂)+s calculating the target film Amplitude of the piece in each target point；

Optionally, as shown in Figure 10, the determining module 803 includes:

First determination unit 8031, for determining the sequence of every stripe in the target gratings strips print image by preset order Number and the reference grating stripe pattern in every stripe serial number, and establish the item in the target gratings strips print image The serial number corresponding relationship of striped in line and the reference grating stripe pattern；

Second determination unit 8032, each target point for determining in the target membrane correspond respectively to the target The serial number of each target striped in grating fringe image；

Third determination unit 8033, for determining in the reference grating stripe pattern according to the serial number corresponding relationship The serial number reference stripe with the order number matches of each target striped respectively；

Acquiring unit 8034, for obtaining reference bit confidence of each reference stripe in the reference grating stripe pattern Breath.

Measuring device 800 provided in an embodiment of the present invention can be realized to measure in the embodiment of the method for Fig. 1, Fig. 5 and Fig. 6 and set The standby each process realized, to avoid repeating, which is not described herein again.Measuring device 800 can once calculate the target film The amplitude of the target point in one face of on piece promotes measurement efficiency so as to reduce measurement duration.

Referring to Fig. 7, the present invention implements to provide also a kind of measuring system, for measuring the amplitude of a target membrane, such as Fig. 7 Shown, measuring system 700 includes:

Rastering laser projector 701, for projecting grating respectively from target projection point to reference planes and target membrane 703 Striped；

Video camera 702, for from target shooting point to projection have the grating fringe the reference planes and the mesh Mark diaphragm 703 is shot respectively, to obtain reference grating stripe pattern and target gratings strips print image, wherein the reference Grating fringe image and the target gratings strips print image are used to calculate the amplitude of each target point in the target membrane 703.

Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In embodiment provided herein, it should be understood that disclosed device and method can pass through others Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit It connects, can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.

It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, ROM, RAM, magnetic or disk etc. are various can store program code Medium.

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.

Claims

1. a kind of vibration amplitude measurement method, for measuring the amplitude of a target membrane characterized by comprising

Project grating fringe respectively from target projection point to reference planes and target membrane, wherein the reference planes be in Plane where the target membrane of stationary state is parallel；

There are the reference planes of the grating fringe and the target membrane to shoot respectively projection from target shooting point, To obtain reference grating stripe pattern and target gratings strips print image；

According to the target gratings strips print image, the corresponding target item of each target point in the target membrane is determined Line, and obtain reference position information of each target striped in the reference grating stripe pattern；

According to the target projection point, the target shooting point, the reference planes and the target film to remain static The location information of piece and the reference position information, calculate the target membrane in the amplitude of each target point.

2. the method according to claim 1, wherein described from target projection point to reference planes and target membrane The step of projecting grating fringe respectively, comprising:

Grating fringe is projected respectively to reference planes and target membrane from target projection point with first angle；

It is described to there are the reference planes of the grating fringe and the target membrane to carry out respectively projection from target shooting point Shooting, the step of to obtain reference grating stripe pattern and target gratings strips print image, comprising:

There are the reference planes of the grating fringe to shoot projection from target shooting point with second angle, to be joined Examine grating fringe image；

There is the target film of the grating fringe to projection with the second angle and preset frame rate from the target shooting point Piece is continuously shot, to obtain the coherent target gratings strips print image of several frames, wherein the preset frame rate and the target The vibration frequency of diaphragm matches；

It is described according to the target gratings strips print image, determine the corresponding target of each target point in the target membrane Striped, and the step of obtaining reference position information of each target striped in the reference grating stripe pattern, comprising:

Determine the target striped that each target point in the target membrane corresponds respectively in every frame target gratings strips print image, And reference bit of each target striped in the reference grating stripe pattern in every frame target gratings strips print image is obtained respectively Confidence breath；

It is described according to the target projection point, the target shooting point, the reference planes and the mesh to remain static The location information of mark diaphragm and the reference position information, calculate the target membrane in the step of the amplitude of each target point Suddenly, comprising:

According to the target projection point, the target shooting point, the reference planes and the target film to remain static Each target striped in the location information of piece and every frame target gratings strips print image is in the reference grating stripe pattern Reference position information calculates separately target membrane described in every frame target gratings strips print image in the amplitude of each target point.

3. the method according to claim 1, wherein described shoot according to the target projection point, the target Point, the location information of the reference planes and the target membrane to remain static and the reference position information, meter The target membrane is calculated the amplitude of each target point the step of, comprising:

Pass through formula A=l-l (d-x₁)/(d-x₂)+s calculates the target membrane in the amplitude of each target point；

Wherein, d indicates the horizontal distance of the target projection point and the target shooting point, l indicate the target projection point with The vertical range of the reference planes, s indicate the reference planes it is vertical with the target membrane that remains static away from From x₁Indicate some target point in the target gratings strips print image in the coordinate value of x-axis direction, x₂It indicates and the target point For corresponding target striped in the coordinate value of the x-axis direction in the reference grating stripe pattern, A indicates the target membrane In the amplitude of the target point.

4. method according to any one of claim 1-3, which is characterized in that the target projection point and the target are clapped It takes the photograph and is a little located on same target level line, the target level line is parallel with the reference planes.

5. method according to any one of claim 1-3, which is characterized in that the reference planes with remain static The target membrane vertical range be more than or equal to the target membrane peak swing.

6. method according to claim 1 or 3, which is characterized in that it is described according to the target gratings strips print image, it determines The corresponding target striped of each target point in the target membrane, and each target striped is obtained in the reference light grizzly bar The step of reference position information in print image, comprising:

The serial number of every stripe and the reference grating bar graph in the target gratings strips print image are determined by preset order The serial number of every stripe as in, and establish in the striped in the target gratings strips print image and the reference grating stripe pattern Striped serial number corresponding relationship；

Determine that each target point in the target membrane corresponds respectively to each target item in the target gratings strips print image The serial number of line；

According to the serial number corresponding relationship, the serial number serial number with each target striped respectively is determined in the reference grating stripe pattern Matched reference stripe；

7. a kind of measuring device, for measuring the amplitude of a target membrane characterized by comprising

Projection module, for projecting grating fringe respectively from target projection point to reference planes and target membrane, wherein the ginseng It is parallel with the plane where the target membrane to remain static to examine plane；

Shooting module, for having the reference planes and the target membrane of the grating fringe to projection from target shooting point It is shot respectively, to obtain reference grating stripe pattern and target gratings strips print image；

Determining module, for according to the target gratings strips print image, determining the difference of each target point in the target membrane Corresponding target striped, and obtain reference position information of each target striped in the reference grating stripe pattern；

Computing module, for according to the target projection point, the target shooting point, the reference planes and remaining static The target membrane location information and the reference position information, calculate the target membrane in each target point Amplitude.

8. measuring device according to claim 7, which is characterized in that the projection module is used for from target projection o'clock with the One angle projects grating fringe to reference planes and target membrane respectively；

The shooting module includes:

First shooting unit, for having the described with reference to flat of the grating fringe from the target shooting point with second angle projection Face is shot, to obtain reference grating stripe pattern；

Second shooting unit, for having the grating to projection from the target shooting point with the second angle and preset frame rate The target membrane of striped is continuously shot, to obtain the coherent target gratings strips print image of several frames, wherein described pre- If frame per second is matched with the vibration frequency of the target membrane；

The determining module is for determining that each target point in the target membrane corresponds respectively to every frame target grating fringe Target striped in image, and each target striped in every frame target gratings strips print image is obtained respectively in the reference light grizzly bar Reference position information in print image；

The computing module is used for according to the target projection point, the target shooting point, the reference planes and is in static Each target striped in the location information of the target membrane of state and every frame target gratings strips print image is in the reference Reference position information in grating fringe image calculates separately target membrane described in every frame target gratings strips print image each The amplitude of target point.

9. measuring device according to claim 7, which is characterized in that the computing module is used to pass through formula A=l-l (d-x₁)/(d-x₂)+s calculates the target membrane in the amplitude of each target point；

10. the measuring device according to any one of claim 7-9, which is characterized in that the target projection point and described Target shooting point is located on same target level line, and the target level line is parallel with the reference planes.

11. the measuring device according to any one of claim 7-9, which is characterized in that the reference planes in quiet Only the vertical range of the target membrane of state is more than or equal to the peak swing of the target membrane.

12. the measuring device according to claim 7 or 9, which is characterized in that the determining module includes:

First determination unit, for determining the serial number of every stripe in the target gratings strips print image by preset order, and The serial number of every stripe in the reference grating stripe pattern, and establish the striped in the target gratings strips print image with it is described The serial number corresponding relationship of striped in reference grating stripe pattern；

Second determination unit, each target point for determining in the target membrane correspond respectively to the target grating fringe The serial number of each target striped in image；

Third determination unit, for determining according to the serial number corresponding relationship, serial number is distinguished in the reference grating stripe pattern With the reference stripe of the order number matches of each target striped；

Acquiring unit, for obtaining reference position information of each reference stripe in the reference grating stripe pattern.