CN109357621A - Three-dimensional vibration displacement measurement device and method based on line scan camera and position-sensing fringes - Google Patents
Three-dimensional vibration displacement measurement device and method based on line scan camera and position-sensing fringes Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/03—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring coordinates of points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
本发明涉及一种基于线阵相机和位感条纹的三维振动位移测量装置与方法。该装置包括位感条纹、线阵相机、数据线和计算机。该方法包括以下步骤：在振动结构测量位置粘贴贴片式位感条纹或者喷涂位感条纹，调整好线阵相机的成像位置，使位感条纹中心成像于线阵传感器中；结构表面的位感条纹随着结构振动，在线阵传感器中成像的条纹信号也随之变化，振动过程中采用线阵相机对条纹信号进行连续成像，再将采集到的条纹序列通过数据线传输至计算机；最后采用条纹序列处理软件模块对条纹序列进行处理，并运用提出的三维位移计算公式计算结构三维振动位移信息。
The invention relates to a three-dimensional vibration displacement measuring device and method based on a line array camera and position-sensing stripes. The device includes a position-sensing stripe, a line scan camera, a data line and a computer. The method includes the following steps: sticking patch-type position-sensing stripes or spraying position-sensing stripes on the vibration structure measurement position, adjusting the imaging position of the line scan camera, so that the center of the position-sensing stripes is imaged in the line-array sensor; As the fringes vibrate with the structure, the fringe signal imaged in the line array sensor also changes. During the vibration process, the fringe signal is continuously imaged by the line array camera, and then the collected fringe sequence is transmitted to the computer through the data line; The sequence processing software module processes the fringe sequence, and uses the proposed three-dimensional displacement calculation formula to calculate the three-dimensional vibration displacement information of the structure.
Description
Technical field
It is especially a kind of that striped is felt based on line-scan digital camera and position the present invention relates to machine vision metrology vibrotechnique field
Three-dimensional vibrating displacement measuring device and method.
Background technique
The vibration signal of structure or equipment has the condition monitoring and fault diagnosis of structure and equipment very important
Meaning, because the dynamic feature information of structure and the variation of structural parameters are closely bound up, by structure dynamics signal
Measurement can diagnose the health status of structure with analysis.
Currently, can be divided mainly into contact type measurement and contactless whether vibration measurement technique is contacted by it with measured structure
Measure two major classes.Contact vibration measurement method mainly obtains the vibration signal of structure by touch sensor, such as accelerates
Spend sensor, displacement sensor, foil gauge etc..These contact measurement methods because its needs is contacted with measured structure,
Additional mass or additional external force may be influenced and be influenced the dynamic characteristic of structure on measured structure, to influence structure
The accurate acquisition of modal parameter, this is less applicable in some occasions for needing precise measurement, especially for some lightweight knots
Structure.Current non-contact measurement method includes current vortex sensor, laser Doppler measuring instrument etc..Current vortex sensor is to tested knot
Required by the material of structure has, and its measuring range is typically small, and there is certain nonlinear problem in its range, limits
Its application.Laser Doppler measuring instrument price is more expensive, for general structure dynamic measurement and it is uneconomical.In addition,
The current contactless measurements such as current vortex sensor and laser Doppler measuring instrument can only generally measure the vibration of single dimension
It is dynamic, it can not achieve a sensor or probe to the synchro measure of multi-dimensional vibration.
With the development of image sensor technologies and image processing techniques, the dynamic measurement method based on machine vision is more next
More it is concerned by people.But many measurement methods need to use the survey that binocular camera is just able to achieve structure three-dimensional vibration before list
Amount, and need to demarcate the space coordinate of camera, actual measurement program is complex.There are also some researchers and propositions
The measurement of the Three-Dimensional Dynamic signal of structure is realized using single two-dimensional image sensor and some specific patterns.But this side
Method generally requires all information of pick-up pattern, and acquisition data volume is bigger, and needs to use two dimensional image correlation or image
The methods of matching carries out image procossing to extract displacement information, and calculation amount is relatively large, and operation efficiency and speed is not high.
Therefore, on the basis of existing three-dimensional vibrating measurement method is understood and studied, the present invention designs one kind
Non-contact 3-D vibration displacement measuring device and method based on line-scan digital camera and position sense striped, this method are only needed tested
Subject surface is arranged a position and feels striped as sensor, using line-scan digital camera as detector, it can realizes structure three-dimensional
The measurement of vibration not only reduces hardware cost for existing measurement method, also reduces acquisition data volume, makes
Vibration signal extracts more quickly and efficiently, improves the efficiency of vibration measurement.
Summary of the invention
The purpose of the present invention is to provide a kind of three-dimensional vibrating displacement measuring devices that striped is felt based on line-scan digital camera and position
With method, which is pasted on body structure surface as sensor, using line-scan digital camera as detection for a position sense striped
Device realizes the synchro measure of structure three-dimensional vibration, and measuring device is simple, and measurement efficiency is high.
To achieve the above object, the technical scheme is that a kind of three-dimensional vibration based on line-scan digital camera and position sense striped
Dynamic displacement measuring device, including
One sense striped is located at tested vibrational structure surface, and the three-dimensional space to perceive tested vibrational structure is displaced letter
Breath；
One line-scan digital camera carries out Image Acquisition and record to the position sense striped to the tested vibrational structure surface, and
Collected striped sequence signal is transmitted to computer by data line；
One data line is transmitted to communication, control and the data between line-scan digital camera and computer；
One computer, to control the line-scan digital camera, and to be transferred to the striped sequence signal of computer into
Row processing in real time, extracts the three-dimensional vibrating information of tested vibrational structure；
One striped series processing software module, is set in the computer, to the striped sequence signal into
Row processing calculates the three-dimensional vibrating signal of tested vibrational structure.
Further, institute's rheme sense striped is lightweight patch, and the one side towards line-scan digital camera is sinusoidal stripe pattern group,
Its one side towards tested vibrational structure surface is viscous layer, to be pasted on tested vibrational structure surface；Or institute's rheme sense striped
Can direct spraying in tested vibrational structure surface, the one side towards line-scan digital camera is sinusoidal stripe pattern group.
Further, the sine streak image group includes three groups of sine streaks, and three groups of sine streak periods are identical, often
Fringe density is constant along its length for group sine streak；Or the sine streak image group includes three groups of sine streaks, and or so
Two groups of sine streaks are vertical parallel stripes, and two groups of sine streaks of middle groups sine streak group and left and right are at predetermined angular；Or institute
It states sine streak image group and includes three groups of sine streaks, and the fringe density and strip length of three groups of sine streaks along its length
It is all identical.
Further, its imaging optical axis and position sense fringe plane are hung down when the line-scan digital camera contraposition sense striped is shot
Directly, and position sense fringe center is made to image in line-scan digital camera.
Further, each stripe signal in the striped sequence signal is made of three groups of stripeds, by female sinusoidal
Stripe signal and stripe signal carry out convolution algorithm, and from the left, center, right of every group of striped convolution sequence three, peak-peak coordinate is true
The center of each striped group in fixed same striped sequence.
Further, the striped group centre distance at left and right sides of the stripe signal will be as tested vibrational structure be along imaging
The vibration displacement of optical axis direction changes and changes, and can find out tested vibrational structure along imaging optical axis direction by the distance change
Displacement information.
Further, the centre distance of the middle stripe group of the stripe signal and left side striped group will be with tested vibration
The vibration displacement in structural vertical direction and change, the ratio of the centre distance and left and right sides striped group centre distance only with it is vertical
The displacement in direction is related, and the vibration displacement that can be obtained tested vibrational structure vertical direction by solving center distance ratio is believed
Breath.
Further, the symmetrical center positions of striped group will be with tested vibrational structure water at left and right sides of the stripe signal
Square to vibration displacement variation and change, the variation by solving the symmetrical center positions can be obtained structure level direction
Vibration displacement information.
Further, the symmetrical center positions of the left and right sides striped group by left side striped group center position coordinates with
The symmetrical centre coordinate value of the center position coordinates of right side striped group determines.
The present invention also provides a kind of three-dimensional vibrating displacement measurement methods that striped is felt based on line-scan digital camera and position, including with
Lower step:
Step S1, striped is felt in tested vibrational structure surface mount patch type position or striped is felt in spraying position, adjust line
The imaging position of array camera images in position sense fringe center in the line array sensor of line-scan digital camera；
Step S2, with the vibration of tested vibrational structure, the position sense striped on tested vibrational structure surface also vibrates therewith,
The stripe signal being imaged in line array sensor also changes therewith, carries out continuous imaging to stripe signal in vibration processes；
Step S3, collected striped sequence signal is transmitted to computer by data line, then using at striped sequence
Reason software module handles striped sequence signal, and calculates structure three-dimensional vibration information.
Further, the process that the striped series processing software module handles striped sequence signal are as follows:
Step S11, first frame stripe signal is chosen as reference frame, seeks the pixel of middle groups stripe signal covering
Number generates female sine streak of equal length and same period number；
Step S12, the convolution sequence for calculating first frame striped and female sine streak, acquires three groups of left, center, right striped and is rolling up
Each accurate coordinate position of peak-peak in product sequence；
Step S13, next frame stripe signal is extracted, the density information of striped is calculated, is counted again according to variable density information
The pixel number of middle stripe covering is calculated, then regenerates new female sine streak, asks current fringes signal and new female sinusoidal item
The convolution sequence of line finally acquires three groups of left, center, right striped each accurate coordinate position of peak-peak in convolution sequence；
Step S14, repeat step S13, calculate three groups of every frame stripe signal left, center, right striped in convolution sequence it is each most
The accurate coordinate position of big peak value；
Step S15, the center of the striped group of every frame stripe signal the right and left is calculated away from variation time-domain signal, can be found out
Displacement information of the tested vibrational structure along imaging optical axis direction；
Step S16, every frame stripe signal middle stripe and left side fringe center distance and the right and left fringe center are calculated
The time domain change curve of distance ratio obtains the vibration displacement information of tested vibrational structure vertical direction；
Step S17, the time-domain signal of fringe center position at left and right sides of every frame stripe signal is calculated, tested vibration knot is obtained
The vibration displacement information of structure horizontal direction.
Further, vibrational structure is tested along the displacement relationship in imaging optical axis direction are as follows:
Wherein, Δ x (i) is displacement of the i-th frame of structure along imaging optical axis direction, and D is that imaging lens and position are felt between striped
Imaging object distance,WithThe centre distance of striped at left and right sides of respectively the i-th frame and reference frame stripe signal.
Further, vibrational structure is tested along the displacement relationship in vertical direction are as follows:
Δ y (i)=W (Ri-Rr)/(Rmax-Rmin)
Wherein, Δ y (i) is the displacement of the i-th frame of structure along the vertical direction, and W is the developed width that striped is felt in position, RminAnd Rmax
Middle stripe and left side fringe center distance and the right and left fringe center distance ratio respectively on position sense width of fringe direction
Minimum value and maximum value, RiAnd RrRespectively the i-th frame and reference frame stripe signal middle stripe and left side fringe center distance with
The ratio of the right and left fringe center distance.
Further, it is tested the displacement relationship of vibrational structure in the horizontal direction are as follows:
Wherein, Δ z (i) is the displacement of the i-th frame of structure in the horizontal direction, and L is that striped the right and left fringe center is felt in position
Actual range, N are pixel number of reference frame stripe signal the right and left fringe center apart from interior covering,WithRespectively
The coordinate of striped symmetrical center positions at left and right sides of i-th frame and reference frame stripe signal.
Compared to the prior art, the invention has the following advantages:
(1) present invention only needs a position sense striped as sensor, and a line-scan digital camera can be perceived as detector
The information of structure three-dimensional vibration, does not need to arrange sensor all the way on each direction of vibration as one-dimensional sensor；
(2) sense striped in position of the invention is low in cost, hardly introducing additional mass, and additional matter will not be introduced to structure
Amount, will not change the modal parameter of structure；
(3) measurement of structure three-dimensional vibration can be realized using line array sensor by the present invention, relative to based on area array sensing
The monocular or binocular vision 3 D vibration measurement method of device, more save the cost, measurement efficiency are higher.
Detailed description of the invention
Fig. 1 is the apparatus structure schematic diagram that Fig. 1 of the present invention is the embodiment of the present invention.
Fig. 2 is stripe design of the embodiment of the present invention and striped series processing flow chart illustration；Wherein, Fig. 2 (a) is to propose
Position sense stripe design figure；Fig. 2 (b) is the center curve of three groups of left, center, right striped in Fig. 2 (a)；Fig. 2 (c) is Fig. 2 (a)
Fringe intensity curve at middle dotted line；Fig. 2 (d) is the convolution sequence intensity of fringe intensity curve and female sine streak in Fig. 2 (c)
Curve.
Fig. 3 is position of embodiment of the present invention sense striped imaging schematic diagram.
In figure, 1- sense stripeds, 2- vibrational structure, 3- line-scan digital camera, 4- data line, 5- computer, 31- linear array sensing
Device, 32- imaging lens.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of three-dimensional vibrating displacement measuring devices that striped is felt based on line-scan digital camera and position, including
One sense striped is located at tested vibrational structure surface, and the three-dimensional space to perceive tested vibrational structure is displaced letter
Breath；
One line-scan digital camera carries out Image Acquisition and record to the position sense striped to the tested vibrational structure surface, and
Collected striped sequence signal is transmitted to computer by data line；
One data line is transmitted to communication, control and the data between line-scan digital camera and computer；
One computer, to control the line-scan digital camera, and to be transferred to the striped sequence signal of computer into
Row processing in real time, extracts the three-dimensional vibrating information of tested vibrational structure；
One striped series processing software module, is set in the computer, to the striped sequence signal into
Row processing calculates the three-dimensional vibrating signal of tested vibrational structure.
The present invention also provides a kind of three-dimensional vibrating displacement measurement methods that striped is felt based on line-scan digital camera and position, including with
Lower step:
Step S1, striped is felt in tested vibrational structure surface mount patch type position or striped is felt in spraying position, adjust line
The imaging position of array camera images in position sense fringe center in the line array sensor of line-scan digital camera；
Step S2, with the vibration of tested vibrational structure, the position sense striped on tested vibrational structure surface also vibrates therewith,
The stripe signal being imaged in line array sensor also changes therewith, carries out continuous imaging to stripe signal in vibration processes；
Step S3, collected striped sequence signal is transmitted to computer by data line, then using at striped sequence
Reason software module handles striped sequence signal, and calculates structure three-dimensional vibration information.
The following are specific implementation processes of the invention.
Fig. 1 is the apparatus structure schematic diagram of the embodiment of the present invention.As shown in Figure 1, the present embodiment provides one kind to be based on linear array
The structure three-dimensional vibration displacement measuring device of camera and position sense striped, including position sense striped 1, vibrational structure 2, line-scan digital camera 3, number
According to line 4, computer 5.The surface of vibrational structure 2 is pasted or be sprayed to position sense striped 1, to perceive the three-dimensional space of vibrational structure 2
Between displacement information.Line-scan digital camera 3 carries out Image Acquisition and record to the position sense striped 1 to 2 surface of vibrational structure, and will acquisition
To stripe signal sequence be transferred to computer 5 by data line 4 and stored and handled.Computer 5 is to control linear array phase
Start and stop and parameter setting of machine, and striped series processing software module is equipped in computer 5, can be to being transmitted to computer
Striped sequence carry out processing in real time to extract the time domain three-dimensional vibrating signal of structure.
Fig. 2 is stripe design of the embodiment of the present invention and striped series processing flow chart illustration.As shown in Fig. 2, wherein Fig. 2
It (a) is that stripe design figure is felt in the position that the present embodiment proposes.Position sense striped 1 is made of three groups of sine streaks, and two groups of the right and left is just
String striped is vertical parallel stripes, and intermediate sinusoidal striped group and two groups of sine streaks of the right and left are angled, and three groups sinusoidal
Striped fringe density along its length and strip length are all identical.Figure (b) is the center for scheming the three groups of stripeds in left, center, right in (a)
Position curve, when (Y-direction) has displacement y to position sense striped in the vertical direction, middle stripe and left side striped center
Distance LclWith the centre distance L of left and right sides stripedrlBetween ratio will change, can be asked by the variation of the ratio
Obtain the displacement signal of 2 vertical direction of vibrational structure.Displacement relationship of the vibrational structure 2 along vertical direction are as follows:
Δ y (i)=W (Ri-Rr)/(Rmax-Rmin)
Wherein Δ y (i) is the displacement of the i-th frame of structure along the vertical direction, and W is the developed width that striped is felt in position, RminAnd Rmax
Middle stripe and left side fringe center distance and the right and left fringe center distance ratio respectively on position sense width of fringe direction
Minimum value and maximum value, RiAnd RrRespectively the i-th frame and reference frame stripe signal middle stripe and left side fringe center distance with
The ratio of the right and left fringe center distance.
The key of three-D displacement measurement is the center location information between acquisition position sense 1 each group striped of striped, (c) is
Scheme the fringe intensity curve in (a) at dotted line.The center location information of each striped group is obtained, the present embodiment is proposed using mother just
String striped and the stripe signal of acquisition carry out convolution algorithm, by the peak-peak position at convolution sequence left, center, right three come really
Determine the center position coordinates of striped.It (d) is the convolution sequence intensity curve of fringe intensity curve in figure (c) and female sine streak,
Wherein Pl、Pc、PrThe center position coordinates of the left, center, right striped group respectively obtained.
Fig. 3 is position of embodiment of the present invention sense striped imaging schematic diagram.As shown in figure 3, imaging optical axis and the position of line-scan digital camera 3
Sense 1 plane of striped is vertical, and line-scan digital camera 3 can only align the striped group that sense certain line position of striped 1 is set every time and is imaged.When vibration is tied
When structure 2 has displacement x along imaging optical axis direction (X-direction), the centre distance that 1 or so parallel stripes group of striped is felt in position is passed in linear array
It will change in sensor 31, and vibrational structure 2 can be realized along the displacement measurement of optical axis direction by the variation, displacement calculates
Relationship are as follows:
Wherein Δ x (i) is displacement of the i-th frame of structure along imaging optical axis direction, D be imaging lens 32 and position feel striped 1 it
Between imaging object distance,WithThe centre distance of striped at left and right sides of respectively the i-th frame and reference frame stripe signal.Wherein Lrl
Formula of mathematical are as follows:
Lrl=Pr-Pl
When (Z-direction) has displacement z to vibrational structure 2 in the horizontal direction, pair of striped at left and right sides of stripe signal is felt in position
Claim center that will change, the variation by solving the symmetrical center positions can be obtained 2 horizontal direction of vibrational structure
Vibration displacement information.The displacement relationship of structure in the horizontal direction are as follows:
Wherein Δ z (i) is the displacement of the i-th frame of structure in the horizontal direction, and L is the reality that striped the right and left fringe center is felt in position
Border distance, N are pixel number of reference frame stripe signal the right and left fringe center apart from interior covering,WithRespectively i-th
The coordinate of striped symmetrical center positions, value calculation formula at left and right sides of frame and reference frame stripe signal are as follows:
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of three-dimensional vibrating displacement measuring device based on line-scan digital camera and position sense striped, which is characterized in that including
One sense striped is located at tested vibrational structure surface, to perceive the three-dimensional space displacement information of tested vibrational structure；
One line-scan digital camera carries out Image Acquisition and record to the position sense striped to the tested vibrational structure surface, and will adopt
The striped sequence signal collected is transmitted to computer by data line；
One data line is transmitted to communication, control and the data between line-scan digital camera and computer；
One computer to control the line-scan digital camera, and carries out the striped sequence signal for being transferred to computer real
When handle, extract the three-dimensional vibrating information of tested vibrational structure；
One striped series processing software module, is set in the computer, to the striped sequence signal
Reason calculates the three-dimensional vibrating signal of tested vibrational structure.
2. the three-dimensional vibrating displacement measuring device according to claim 1 based on line-scan digital camera and position sense striped, feature
It is, institute's rheme sense striped is lightweight patch, and the one side towards line-scan digital camera is sinusoidal stripe pattern group, towards by vibration measuring
The one side of dynamic body structure surface is viscous layer, to be pasted on tested vibrational structure surface；Or institute's rheme sense striped can direct spraying in
Tested vibrational structure surface, the one side towards line-scan digital camera are sinusoidal stripe pattern group；The sine streak image group includes
Three groups of sine streaks, and three groups of sine streak periods are identical, fringe density is constant along its length for every group of sine streak；Or it is described
Sine streak image group includes three groups of sine streaks, and two groups of left and right sine streak is vertical parallel stripes, middle groups sine item
Two groups of sine streaks of line group and left and right are at predetermined angular；Or the sine streak image group includes three groups of sine streaks, and three groups
Sine streak fringe density along its length and strip length are all identical.
3. the three-dimensional vibrating displacement measuring device according to claim 1 based on line-scan digital camera and position sense striped, feature
It is, its imaging optical axis is vertical with position sense fringe plane when the line-scan digital camera contraposition sense striped is shot, and position is made to feel item
Line center images in line-scan digital camera.
4. the three-dimensional vibrating displacement measuring device according to claim 1 based on line-scan digital camera and position sense striped, feature
It is, each stripe signal in the striped sequence signal is made of three groups of stripeds, passes through female sine streak signal and item
Line signal carries out convolution algorithm, and from the left, center, right of every group of striped convolution sequence three, peak-peak coordinate determines same striped sequence
The center of each striped group in column.
5. the three-dimensional vibrating displacement measuring device according to claim 4 based on line-scan digital camera and position sense striped, feature
It is, the striped group centre distance at left and right sides of the stripe signal will be as tested vibrational structure be along the vibration in imaging optical axis direction
It moves change in displacement and changes, tested vibrational structure can be found out along the displacement information in imaging optical axis direction by the distance change；
The middle stripe group of the stripe signal and the centre distance of left side striped group will be with the vibrations of tested vibrational structure vertical direction
It moving displacement and changes, the ratio of the centre distance and left and right sides striped group centre distance is only related with the displacement of vertical direction,
It can be obtained the vibration displacement information of tested vibrational structure vertical direction by solving center distance ratio；The stripe signal is left
The symmetrical center positions of right two sides striped group will change with the vibration displacement of tested vibrational structure horizontal direction and be changed, and pass through
The variation for solving the symmetrical center positions can be obtained the vibration displacement information in structure level direction；The left and right sides striped group
Symmetrical center positions by the center position coordinates of left side striped group and the center position coordinates of right side striped group symmetrical centre
Coordinate value determines.
6. a kind of three-dimensional vibrating displacement measurement method based on line-scan digital camera and position sense striped, which is characterized in that including following step
It is rapid:
Step S1, striped is felt in tested vibrational structure surface mount patch type position or striped is felt in spraying position, adjust linear array phase
The imaging position of machine images in position sense fringe center in the line array sensor of line-scan digital camera；
Step S2, with the vibration of tested vibrational structure, the position sense striped on tested vibrational structure surface also vibrates therewith, in linear array
The stripe signal being imaged in sensor also changes therewith, carries out continuous imaging to stripe signal in vibration processes；
Step S3, collected striped sequence signal is transmitted to computer by data line, then soft using striped series processing
Part module handles striped sequence signal, and calculates structure three-dimensional vibration information.
7. the three-dimensional vibrating displacement measurement method according to claim 6 based on line-scan digital camera and position sense striped, feature
It is, the process that the striped series processing software module handles striped sequence signal are as follows:
Step S11, first frame stripe signal is chosen as reference frame, seeks the pixel number of middle groups stripe signal covering, it is raw
At female sine streak of equal length and same period number；
Step S12, the convolution sequence for calculating first frame striped and female sine streak, acquires three groups of left, center, right striped in convolution sequence
Each accurate coordinate position of peak-peak in column；
Step S13, next frame stripe signal is extracted, the density information of striped is calculated, is recalculated according to variable density information
Between the pixel number that covers of striped, then regenerate new female sine streak, ask current fringes signal and new female sine streak
Convolution sequence finally acquires three groups of left, center, right striped each accurate coordinate position of peak-peak in convolution sequence；
Step S14, step S13 is repeated, three groups of every frame stripe signal left, center, right striped each maximum peak in convolution sequence is calculated
It is worth accurate coordinate position；
Step S15, the center of the striped group of every frame stripe signal the right and left is calculated away from variation time-domain signal, can be found out tested
Displacement information of the vibrational structure along imaging optical axis direction；
Step S16, every frame stripe signal middle stripe and left side fringe center distance and the right and left fringe center distance are calculated
The time domain change curve of ratio obtains the vibration displacement information of tested vibrational structure vertical direction；
Step S17, the time-domain signal of fringe center position at left and right sides of every frame stripe signal is calculated, tested vibrational structure water is obtained
Square to vibration displacement information.
8. the three-dimensional vibrating displacement measurement method according to claim 7 based on line-scan digital camera and position sense striped, feature
It is, is tested vibrational structure along the displacement relationship in imaging optical axis direction are as follows:
Wherein, Δ x (i) is displacement of the i-th frame of structure along imaging optical axis direction, D be imaging lens and position feel between striped at
Picture object distance,WithThe centre distance of striped at left and right sides of respectively the i-th frame and reference frame stripe signal.
9. the three-dimensional vibrating displacement measurement method according to claim 7 based on line-scan digital camera and position sense striped, feature
It is, is tested vibrational structure along the displacement relationship in vertical direction are as follows:
Δ y (i)=W (Ri-Rr)/(Rmax-Rmin)
Wherein, Δ y (i) is the displacement of the i-th frame of structure along the vertical direction, and W is the developed width that striped is felt in position, RminAnd RmaxRespectively
Middle stripe and left side fringe center distance are felt on width of fringe direction with the right and left fringe center distance ratio most for position
Small value and maximum value, RiAnd RrRespectively the i-th frame and reference frame stripe signal middle stripe and left side fringe center distance and left and right
The ratio of both sides striped centre distance.
10. the three-dimensional vibrating displacement measurement method according to claim 7 based on line-scan digital camera and position sense striped, feature
It is, is tested the displacement relationship of vibrational structure in the horizontal direction are as follows:
Wherein, Δ z (i) is the displacement of the i-th frame of structure in the horizontal direction, and L is the reality that striped the right and left fringe center is felt in position
Distance, N are pixel number of reference frame stripe signal the right and left fringe center apart from interior covering,WithRespectively the i-th frame
With the coordinate of striped symmetrical center positions at left and right sides of reference frame stripe signal.
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