CN108195294B - A kind of diameter measuring method and laser raindrop spectrograph of falling particles - Google Patents
A kind of diameter measuring method and laser raindrop spectrograph of falling particles Download PDFInfo
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- CN108195294B CN108195294B CN201810054863.5A CN201810054863A CN108195294B CN 108195294 B CN108195294 B CN 108195294B CN 201810054863 A CN201810054863 A CN 201810054863A CN 108195294 B CN108195294 B CN 108195294B
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- 239000002245 particle Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000005622 photoelectricity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 26
- 238000001556 precipitation Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000035772 mutation Effects 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
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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
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/10—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/14—Rainfall or precipitation gauges
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Abstract
The present invention provides a kind of diameter measuring method of falling particles and laser raindrop spectrograph, which includes: Laser emission end, the radical occlusion device with slit and laser pick-off end；The parallel laser of Laser emission end transmitting can pass through the slit of radical occlusion device, and the width at the both ends of slit is all larger than the width among slit, so that the thickness for passing through the middle section of the parallel laser of slit can be less than the thickness of both ends part, then the intensity across the middle section of the parallel laser of slit is reduced to a certain extent, and the laser intensity of both ends part is held essentially constant, so that the laser intensity of the parallel laser can have the better linearity.At this point, measuring the diameter of falling particles using the parallel laser with the more preferable linearity, enable to the measurement error of falling particles smaller.
Description
Technical field
The present invention relates to field of optical equipment, diameter measuring method and laser raindrop more particularly, to a kind of falling particles
Spectrometer.
Background technique
Laser raindrop spectrograph (also having referred to as precipitation phenomenon instrument) is used to utilize laser technology, to raindrop, snowflake or hail
The diameter of equal falling particles measures, and the diameter of falling particles is of great significance to the calculating of the parameters such as precipitation.
A kind of common laser raindrop spectrograph includes Laser emission end and laser pick-off end, and utilizes the prominent of laser intensity
Variable measures the diameter of falling particles, and specific measurement process includes: Laser emission end transmitting parallel laser, at Laser emission end
Measured zone is formed between laser pick-off end, parallel laser can be caused to block when falling particles pass through measured zone, made
The mutation that the laser that laser pick-off termination receives generates laser intensity is obtained, laser pick-off end is according to the Sudden Changing Rate of laser intensity under
Proportional relationship between the diameter of shattering, calculates the diameter of falling particles.
However, it is found by the inventors that current laser raindrop spectrograph is in the mutation measurement falling particles using laser intensity
Diameter when, measurement error is often larger, and then causes the measurement error of the parameters such as precipitation also bigger, especially works as precipitation
When measuring larger, measurement error even can reach 15% or more.
Summary of the invention
Present invention solves the technical problem that be to provide the diameter measuring method and laser raindrop spectrograph of a kind of falling particles,
Measurement error can be reduced when measuring the falling particles such as raindrop, snowflake or hail to realize, improve accuracy of measurement.
For this purpose, the technical solution that the present invention solves technical problem is:
The present invention provides a kind of laser raindrop spectrographs, comprising: Laser emission end, radical occlusion device and laser with slit
Receiving end；
The Laser emission end is for emitting parallel laser；
The front end at the Laser emission end is arranged in the radical occlusion device with slit, the shape between the laser pick-off end
At measured zone；Slit on the radical occlusion device is arranged on the surface of emission of the parallel laser, so that the parallel laser
It is at least partially obscured across the slit and on the thickness direction of the parallel laser；Wherein, wherein one end of the slit or
The width at person both ends is greater than the width of the centre of the slit；
Swashing for received parallel laser is detected for receiving the parallel laser across the slit in the laser pick-off end
Luminous intensity calculates falling particles according to the Sudden Changing Rate of the laser intensity when judging that the laser intensity mutates
Diameter.
In some possible embodiments, the width of wherein one end of the slit is greater than the other end of the slit
Width, wherein compared to the other end, the distance between point light source of the parallel laser is farther for described wherein one end.
In some possible embodiments, the radical occlusion device includes shielding plate and fixinig plate, and the slit setting exists
On the shielding plate, the fixinig plate is for being fixed the radical occlusion device.
In some possible embodiments, have between the radical occlusion device and the surface of emission of the parallel laser adjustable
Angle.
In some possible embodiments, the length of the slit is greater than the width of the parallel laser.
In some possible embodiments, the Laser emission end includes: photoelectric conversion module and processing module；
The photoelectric conversion module carries out light for receiving the parallel laser across the slit, to received parallel laser
Electricity conversion, is sent to processing module for the electric signal after conversion；
The processing module is used to detect the laser intensity of received parallel laser according to the electric signal, when judging
When stating laser intensity mutation, the diameter of falling particles is calculated according to the Sudden Changing Rate of the laser intensity.
In addition, being used in laser raindrop spectrograph, the laser rain the present invention also provides a kind of radical occlusion device with slit
Droplet collector further includes Laser emission end and laser pick-off end；
The front end at the Laser emission end is arranged in the radical occlusion device, forms measured zone between laser pick-off end；
Slit on the radical occlusion device is arranged on the surface of emission of the parallel laser, so that the parallel laser passes through the slit
And it is at least partially obscured on the thickness direction of the parallel laser；Wherein, the width of the wherein one or both ends of the slit
Greater than the width of the centre of the slit.
In some possible embodiments, the width of wherein one end of the slit is greater than the other end of the slit
Width, wherein compared to the other end, the distance between point light source of the parallel laser is closer for described wherein one end.
In some possible embodiments, the radical occlusion device includes shielding plate and fixinig plate, and the slit setting exists
On the shielding plate, the fixinig plate is for being fixed the radical occlusion device.
In some possible embodiments, have between the radical occlusion device and the surface of emission of the parallel laser adjustable
Angle.
In some possible embodiments, the length of the slit is greater than the width of the parallel laser.
In addition, be used in above-mentioned laser raindrop spectrograph the present invention also provides a kind of diameter measuring method of falling particles,
The described method includes:
The parallel laser of the Laser emission end transmitting passes through the slit, and on the thickness direction of the parallel laser
It is at least partially obscured；
The laser pick-off end receives the parallel laser across the slit, and the laser for detecting received parallel laser is strong
Degree calculates the diameter of falling particles according to the Sudden Changing Rate of the laser intensity when judging that the laser intensity mutates.
According to the above-mentioned technical solution, it is connect in the embodiment of the present invention at the Laser emission end of laser raindrop spectrograph and laser
The radical occlusion device with slit is provided between receiving end, the slit on radical occlusion device is arranged on the surface of emission of the parallel laser,
So that the parallel laser passes through the slit and is at least partially obscured on the thickness direction of the parallel laser；Wherein, described
The width of the wherein one or both ends of slit is greater than the width of the centre of the slit, that is to say, that slit is using both ends
Or one end is relative to intermediate broader structure.
By inventor the study found that laser raindrop spectrograph in the prior art is calculated using the Sudden Changing Rate of laser intensity
When, why can there is a problem of that measurement error is larger, be because being based on swashing in parallel when calculating the diameter of falling particles
The laser intensity of light be linear distribution it is assumed that however in actual application, the laser intensity of parallel laser be not be line
Property distribution, and asymmetrical parabolic distribution actually as shown in Figure 1.By Laser emission end and laser pick-off end it
Between be provided with the radical occlusion device with slit so that parallel laser is at least partially obscured in a thickness direction, and wherein the one of slit
The width at end or both ends is bigger, therefore the part blocked is smaller, and the width of the centre of slit is smaller, therefore the part blocked
Bigger, after this special construction of slit enables to parallel laser to pass through slit, the linearity of laser intensity is more preferable, to make
The measurement error for obtaining falling particles is smaller.Show that this mode enables to measurement error to be reduced within 5% by experiment,
Even it can reduce to 1%.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for
For those of ordinary skill in the art, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the asymmetrical parabolic distribution schematic diagram of the laser intensity of parallel laser in existing laser raindrop spectrograph；
Fig. 2 is the structural schematic diagram of existing laser raindrop spectrograph；
Fig. 3 is a specific embodiment of the equal laser raindrop spectrograph of slit both ends provided by the embodiments of the present application width
Structural schematic diagram；
Fig. 4 is an exemplary structure schematic diagram of slit in the embodiment of the present application；
Fig. 5 is an exemplary structure schematic diagram of the radical occlusion device 302 with slit in the embodiment of the present application；
Fig. 6 is the schematic diagram for constituting angle in the embodiment of the present application between fixinig plate 501 and the surface of emission of parallel laser；
Fig. 7 is the knot for one specific embodiment of laser raindrop spectrograph that slit both ends provided by the embodiments of the present application width does not wait
Structure schematic diagram；
Fig. 8 is a kind of flow diagram of the diameter measuring method of falling particles in the embodiment of the present application.
Specific embodiment
Existing laser raindrop spectrograph (also having referred to as precipitation phenomenon instrument), generallys use structure as shown in Figure 2 to measure
The size of the falling particles such as raindrop, snowflake or hail.Wherein, in the laser raindrop spectrograph include Laser emission end 201 and
Laser pick-off end 202 is spaced pre-determined distance between Laser emission end 201 and laser pick-off end 202.Theoretically, laser raindrop size distribution
During instrument is worked, Laser emission end 201 can launch that a branch of width and thickness is fixed and laser intensity is linear
The parallel laser of distribution, for example, Laser emission end 201 can emit to laser pick-off end 202 a beam width 30mm, thickness 1mm it is flat
Row laser, and the Shu Jiguang can be received by laser pick-off end 202, thus at Laser emission end 201 and laser pick-off end
Measured zone is formed between 202.Wherein, Laser emission end 201 would generally be faced with laser pick-off end 202, so that laser
The laser intensity that receiving end 202 receives is maximum.
The laser intensity for the parallel laser that laser pick-off end 202 is received by detection, can determine in measured zone is
It is no falling particles occur.Specifically, laser pick-off end 202 receives flat when passing through measured zone there is no falling particles
The laser intensity variation of row laser is small, can approximation regard as and will not change substantially, and laser pick-off end 202 connects at this time
The laser intensity of the parallel laser received can be used as reference laser intensity；But when there are falling particles (such as raindrop) by surveying
When measuring region, falling particles can block the part parallel laser of measured zone so that laser pick-off end 202 receive it is parallel sharp
The laser intensity mutation formula of light declines.That is, when the laser of the parallel laser received is detected at laser pick-off end 202
Intensity is compared with reference laser intensity when decline suddenly, so that it may determine that there are falling particles in measured zone, and the whereabouts
Particle has blocked the part parallel laser that Laser emission end 201 emits to laser pick-off end 202.
It, can be according to the parallel laser received after laser pick-off end 202 falling particles occurs in determining measured zone
Laser intensity, the parallel laser laser intensity Sudden Changing Rate and reference laser intensity, the diameter of falling particles is calculated.
Specifically, when Laser emission end 201 emit parallel laser, when being blocked by falling particles, can approximation have
Wherein, d is the diameter of falling particles, and laser pick-off end 202 receives parallel when r blocks parallel laser for no falling particles
The width (usually equal with the width of parallel laser that Laser emission end 201 emits) of laser, P1For benchmark laser intensity, Δ P
For the laser intensity Sudden Changing Rate for the parallel laser that laser pickoff 202 receives, the i.e. difference between reference laser intensity.Cause
This, the diameter that laser pick-off end 202 can calculate falling particles is
But applicant it has been investigated that, Laser emission end 201 send parallel laser laser intensity be not be linear
Distribution, but Unsymmetrical Parabolic line distribution (being similar to Gaussian Profile) as shown in Figure 1, that is, Laser emission end 201 emits flat
The laser intensity of the middle section of row laser, can be bigger than the laser intensity of the both ends part of parallel laser.Therefore, because parallel
The laser intensity of laser is in nonlinear parabolic distribution in the width direction of parallel laser, flat based on intermediate measured zone
The diameter for the falling particles that row laser is calculated is more accurate, and the parallel laser based on left and right ends measured zone is calculated
The diameter of obtained falling particles, there are large errors between the actual diameter of the falling particles.Wherein, the horizontal seat in Fig. 1
It is designated as laser wire length, refers to the position that the parallel laser that Laser emission end 201 is launched passes through in the direction of the width
Set coordinate.Experiment shows to add up precipitation when using the diameter of laser raindrop spectrograph measurement falling particles as shown in Figure 2
Measurement error can be normally reached 10% or more, and then cause the measurement error of the parameters such as precipitation also bigger, especially
When precipitation intensity is larger, parallel laser is larger in left and right ends accumulated error, and precipitation measurement error is caused possibly even to reach
To 15% or more.
In order to solve the above-mentioned technical problem, the laser raindrop spectrograph that this application provides a kind of for measuring falling particles and
The diameter measuring method of falling particles, to reduce the error between the measurement diameter of falling particles and its actual diameter.Specifically,
The laser raindrop spectrograph includes Laser emission end, the radical occlusion device with slit and laser pick-off end.Wherein, Laser emission end is used
In transmitting parallel laser；The front end at Laser emission end is arranged in radical occlusion device with slit, is formed and is surveyed between laser pick-off end
Region is measured, the slit on the radical occlusion device is arranged on the surface of emission of parallel laser, so that parallel laser passes through slit and flat
It is at least partially obscured on the thickness direction of row laser, wherein the width of the wherein one or both ends of slit is greater than the centre of slit
Width；Laser pick-off end is used to receive the parallel laser across slit, and detects the laser intensity of the parallel laser received,
When judging that laser intensity mutates, the diameter of falling particles is calculated according to the Sudden Changing Rate of laser intensity.
Although being put down as it can be seen that the laser intensity of the parallel laser of Laser emission end transmitting is in asymmetrical parabolic distribution
The laser intensity of the middle section of row laser is higher, and the laser intensity of both ends part is lower, but the transmitting of Laser emission end is flat
Row laser can pass through the slit of radical occlusion device, and the width of the one or both ends of slit is greater than the width among slit, makes
The thickness for obtaining the middle section of the parallel laser across slit can be less than the thickness of one end or both ends part, correspondingly, wearing
The intensity for crossing the middle section of the parallel laser of slit is reduced to a certain extent, and the laser of one end or both ends part
Intensity can be held essentially constant, so that the laser intensity of the parallel laser can have the better linearity.Therefore, sharp
The diameter that falling particles are measured with the parallel laser for passing through slit, enables to the measurement error of falling particles can be smaller.It is real
The diameter for showing that falling particles are measured using the parallel laser across slit is tested, measurement error can reduce under normal circumstances
It is also can reduce 2% or so, when even precipitation is bigger to 5%, when multiple precipitation is more than 50 millimeters, measurement is missed
Difference can reduce to 1% or so, greatly reduce the measurement error of falling particles diameter.
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without creative efforts
Range.
A kind of Installation practice of the laser raindrop spectrograph in the embodiment of the present application is shown also referring to Fig. 3, Fig. 3.
Wherein, which includes Laser emission end 301, the radical occlusion device 302 with slit and laser pick-off end 303.
Laser emission end 301 is for emitting parallel laser.The Distribution of laser intensity of the parallel laser can be as shown in Figure 1
Unsymmetrical Parabolic line distribution, be approximately Gaussian Profile.
The front end at Laser emission end 301 is arranged in radical occlusion device 302 with slit, constitutes between laser pick-off end 303
Parallel laser region, for the measured zone of the laser raindrop spectrograph, when falling particles pass through radical occlusion device 302 and laser pick-off
When holding the measured zone between 303, laser raindrop spectrograph can calculate the diameter of the falling particles.
Slit on the radical occlusion device 302 is arranged on the surface of emission of parallel laser, so that Laser emission end 301 emitted
Parallel laser passes through the slit and is at least partially obscured on the thickness direction of the parallel laser, wherein the width at the slit both ends
It is all larger than the width of the centre of the slit, that is to say, that the slit is generally in the narrow structure in the wide centre in both ends.It needs to illustrate
It is that the slit can be irregular structure, such as shown in Fig. 4.In addition, the specific structure of the slit can be carried out by experiment
Measurement for example, constantly changing the structure of slit, and measures the Distribution of laser intensity of the parallel laser across slit, works as basis
When Distribution of laser intensity determines that the linearity of parallel laser is preferable (here can according to the measurement errors of falling particles whether
Determine whether the linearity is preferable in preset range), obtain the final structure of slit.
As shown in figure 3, it is m that width is launched at Laser emission end 301, with a thickness of the parallel laser of n, which is being worn
When crossing the radical occlusion device 302 with slit, be not parallel laser all can pass through the radical occlusion device 302, but only not by
The parallel laser blocked can pass through.Specifically, in a thickness direction, since the width among slit is less than the width at both ends,
Thickness across the middle section of the parallel laser of radical occlusion device 302, can be less than the thickness of both ends part, namely is less than laser and sends out
Penetrate the thickness n of the parallel laser of 301 transmitting of end.That is, Laser emission end 301 emit parallel laser pass through block dress
When setting 302, it can be at least partially obscured on the thickness direction of the parallel laser.
Under normal circumstances, the slit on radical occlusion device 302 can change parallel after the slit on radical occlusion device 302
The thickness of laser, and do not change the width of parallel laser, i.e., the width of the parallel laser after slit and Laser emission end
The equivalent width of the parallel laser of 301 transmittings.Therefore, in order to guarantee that the slit on radical occlusion device does not change the width of parallel laser
Degree, the length that can set slit is greater than the width for the parallel laser that Laser emission end 301 emits, for example, the width of parallel laser
Degree is 30mm, then the length of slit can be 31mm, 32mm etc..
In some possible embodiments, slit can be set on the shielding plate on radical occlusion device 302.Specifically,
Please refer to fig. 5, Fig. 5 shows a kind of exemplary structure schematic diagram of radical occlusion device 302, radical occlusion device 302 includes fixing
Piece 501 and shielding plate 502, slit are arranged on shielding plate 502, and fixinig plate 501 is for being fixed the radical occlusion device.
Radical occlusion device can have adjustable angle between the surface of emission of parallel laser.With radical occlusion device shown in fig. 5
For, there is angle between the surface of emission of the parallel laser of the shielding plate 502 on the radical occlusion device and the transmitting of Laser emission end 301
Degree, as shown in fig. 6, constituting angle [alpha] between shielding plate 502 and the surface of emission of parallel laser.In some possible embodiments
In, which can be adjusted between 0-180 ° (not including 0 ° and 180 °), for example, when the angle is 90 °, shielding plate
502 is vertical with the surface of emission of parallel laser.Wherein, which can be laser raindrop spectrograph when leaving the factory just
It has been be preset that, be also possible to be carried out according to the needs of actual conditions by related technical personnel from main regulation, in some fields
Under scape, it can also be and be adjusted automatically by laser raindrop spectrograph according to environmental factor etc..
In practical application, in order to guarantee multiple laser raindrop spectrographs measurement accuracy consistency, can usually allow each
The laser intensity of the parallel laser of the measured zone of laser raindrop spectrograph is consistent.In some possible embodiments, may be used
With by adjusting the angle between shielding plate 502 and the surface of emission of parallel laser, so that the measurement zone of each laser raindrop spectrograph
The laser intensity of the parallel laser in domain is consistent.
Laser pick-off end 303, for receiving the parallel laser across slit, and the laser for detecting received parallel laser is strong
Degree calculates the diameter of falling particles according to the Sudden Changing Rate of the laser intensity when judging that the laser intensity mutates.
In a kind of illustrative specific embodiment, laser pick-off end 303 includes photoelectric conversion module and processing module.
Photoelectric conversion module in laser pick-off end 303 receives the parallel laser across slit, and to the parallel laser received into
Then the electric signal is sent to processing module with the electric signal after being converted by row photoelectric conversion；Processing module is according to reception
Electric signal after to conversion detects the laser intensity of the parallel laser received, when judging that laser intensity mutates, root
The diameter of falling particles is calculated according to the Sudden Changing Rate of laser intensity.Detailed process can be with are as follows: judges the laser intensity of the parallel laser
Whether the difference between reference laser intensity is greater than preset value, if so, showing that there are falling particles to pass through measured zone, then
It can basisCalculate the diameter of falling particlesWherein, Δ P be the parallel laser laser intensity with
The difference of reference laser intensity, P1For benchmark laser intensity, r passes through the width of the parallel laser of slit.
In the present embodiment, the parallel laser that Laser emission end 301 emits can pass through the slit of radical occlusion device 302, and narrow
The width at the both ends of seam is all larger than the width among slit, so that the thickness for passing through the middle section of the parallel laser of slit can be small
Thickness in both ends part, then the intensity across the middle section of the parallel laser of slit is reduced to a certain extent, and two
The laser intensity of end part is held essentially constant, so that the laser intensity of the parallel laser can have preferably linearly
Degree.At this point, measuring the diameter of falling particles using the parallel laser with the more preferable linearity, the survey of falling particles is enabled to
It is smaller to measure error.
It should be noted that the width at the both ends of the slit in above-described embodiment on radical occlusion device 302 is all larger than centre
Width, in other embodiments, the width that radical occlusion device is also possible to wherein any end are greater than intermediate width, and the application is real
Example is applied to this and is not limited, specific implementation is similar to the above embodiments, can refer to understanding, details are not described herein.
Under normal conditions, laser raindrop spectrograph generates parallel laser using point light source, wherein one end of the parallel laser
Compared to the other end, the distance apart from point light source is farther, and laser intensity is also smaller.Therefore, These characteristics are directed to, it can be to screening
The width at the slit both ends on blocking means is adaptively adjusted, so that the width of described wherein one end is greater than the other end
Width.It can make in the parallel laser of slit in this way, the thickness of the laser of one end close apart from point light source is smaller, distance
The thickness of the laser of the remote one end of point light source is larger, further such that passing through the linearity of the laser intensity of the parallel laser of slit
More preferably.
For example, the distance between the end B and point light source are closer in the parallel laser that Laser emission end is emitted, the end A and point light
The distance between source is farther, and slit can be as shown in fig. 7, the width at width ratio B ' at A ' be big, correspondingly, passing through slit A '
The thickness of the laser at place is bigger than by the thickness at slit B '.
In addition, being applied to laser raindrop size distribution present invention also provides a kind of specific embodiment of the radical occlusion device with slit
In instrument, which further includes Laser emission end and laser pick-off end.
The front end at Laser emission end is arranged in the radical occlusion device, forms measured zone between laser pick-off end.This is blocked
Slit on device is arranged on the surface of emission of parallel laser, so that parallel laser passes through slit and in the thickness side of parallel laser
It is at least partially obscured upwards；Wherein, the width of the one or both ends of the slit is greater than the width of the centre of slit.
Laser emission end is for emitting parallel laser.
Laser pick-off end is used to receive the parallel laser of slit on the radical occlusion device, and detection receive it is parallel
The laser intensity of laser calculates falling particles according to the Sudden Changing Rate of laser intensity when judging that the laser intensity mutates
Diameter.
In some possible embodiments, the width of wherein one end of the slit on radical occlusion device is greater than the another of the slit
The width of one end, wherein wherein compared to the other end, the distance between point light source of parallel laser is closer for one end for this.
In some possible embodiments, which further includes shielding plate and fixinig plate, and slit is arranged in the screening
On baffle, fixinig plate is for being fixed the radical occlusion device.
In some possible embodiments, the parallel laser of the fixinig plate on the radical occlusion device and the transmitting of Laser emission end
The surface of emission between have adjustable angle.
In some possible embodiments, the length of the slit is greater than the width of the parallel laser of Laser emission end transmitting
Degree.
In the present embodiment, the radical occlusion device with slit can carry out part screening to the parallel laser that Laser emission end emits
Gear, so that the thickness for passing through the middle section of the parallel laser of slit can be less than the thickness of both ends part, then across the flat of slit
The intensity of the middle section of row laser is significantly reduced, and the laser intensity of both ends part is held essentially constant, to make
The laser intensity for obtaining the parallel laser has the better linearity.At this point, being surveyed using the parallel laser with the more preferable linearity
The diameter for measuring falling particles, enables to the measurement error of falling particles smaller.
Radical occlusion device in the present embodiment refers to the associated description in above-described embodiment to radical occlusion device, no longer superfluous here
It states.
In addition, the embodiment of the present application also provides a kind of specific embodiments of the diameter measuring method of falling particles.It please one
And a kind of flow diagram of the diameter measuring method of falling particles in the embodiment of the present application is shown refering to Fig. 8, Fig. 8.The party
Method can specifically include:
S801: the parallel laser of Laser emission end transmitting passes through the slit on radical occlusion device, and in the thickness of parallel laser
It is at least partially obscured on direction.
S802: laser pick-off end receives the parallel laser across the slit, and the laser for detecting received parallel laser is strong
Degree calculates the diameter of falling particles according to the Sudden Changing Rate of the laser intensity when judging that the laser intensity mutates.
The method in the present embodiment can be used in any embodiment of laser raindrop spectrograph of the invention.
In the present embodiment, the radical occlusion device with slit can carry out part screening to the parallel laser that Laser emission end emits
Gear, so that the thickness for passing through the middle section of the parallel laser of slit can be less than the thickness of both ends part, then across the flat of slit
The intensity of the middle section of row laser obtains a degree of reduction, and the laser intensity of both ends part is held essentially constant, from
And make the laser intensity of the parallel laser that there is the better linearity.At this point, utilizing the parallel laser with the more preferable linearity
The diameter of falling particles is measured, enables to the measurement error of falling particles smaller.
It is apparent to those skilled in the art that for convenience and simplicity of description, foregoing description with narrow
The specific implementation process of the radical occlusion device of seam, method, can with reference to aforementioned laser raindrop spectrometer Installation practice in correspondence
Process, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.Above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to aforementioned reality
Example is applied the application is described in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (12)
1. a kind of laser raindrop spectrograph characterized by comprising Laser emission end, the radical occlusion device with slit and laser connect
Receiving end；
The Laser emission end is for emitting parallel laser；
The front end at the Laser emission end is arranged in the radical occlusion device with slit, is formed and is surveyed between the laser pick-off end
Measure region；Slit on the radical occlusion device is arranged on the surface of emission of the parallel laser, so that the parallel laser passes through
The slit is simultaneously at least partially obscured on the thickness direction of the parallel laser；Wherein, wherein one end or two of the slit
The width at end is greater than the width of the centre of the slit；
The laser pick-off end is for receiving the parallel laser across the slit, and the laser for detecting received parallel laser is strong
Degree calculates the diameter of falling particles according to the Sudden Changing Rate of the laser intensity when judging that the laser intensity mutates.
2. laser raindrop spectrograph according to claim 1, which is characterized in that the width of wherein one end of the slit is greater than
The width of the other end of the slit, wherein point light of the described wherein one end compared to the other end, with the parallel laser
The distance between source is farther.
3. laser raindrop spectrograph according to claim 1, which is characterized in that the radical occlusion device includes shielding plate and fixation
Piece, the slit are arranged on the shielding plate, and the fixinig plate is for being fixed the radical occlusion device.
4. laser raindrop spectrograph according to claim 1, which is characterized in that the radical occlusion device and the parallel laser
There is adjustable angle between the surface of emission.
5. laser raindrop spectrograph according to claim 1, which is characterized in that the length of the slit is greater than described parallel sharp
The width of light.
6. laser raindrop spectrograph according to claim 1, which is characterized in that the Laser emission end includes: photoelectric conversion
Module and processing module；
The photoelectric conversion module carries out photoelectricity to received parallel laser and turns for receiving the parallel laser across the slit
It changes, the electric signal after conversion is sent to processing module；
The processing module is used to detect the laser intensity of received parallel laser according to the electric signal, described sharp when judging
When luminous intensity mutates, the diameter of falling particles is calculated according to the Sudden Changing Rate of the laser intensity.
7. a kind of radical occlusion device with slit, which is characterized in that in laser raindrop spectrograph, the laser raindrop spectrograph also to be wrapped
Include Laser emission end and laser pick-off end；
The front end at the Laser emission end is arranged in the radical occlusion device, forms measured zone between laser pick-off end；It is described
Slit on radical occlusion device is arranged on the surface of emission of parallel laser, so that the parallel laser passes through the slit and described
It is at least partially obscured on the thickness direction of parallel laser；Wherein, the width of the wherein one or both ends of the slit is greater than described
The width of the centre of slit.
8. radical occlusion device according to claim 7, which is characterized in that the width of wherein one end of the slit is greater than described
The width of the other end of slit, wherein described wherein one end compared to the other end, with the point light source of the parallel laser it
Between distance it is closer.
9. radical occlusion device according to claim 7, which is characterized in that the radical occlusion device includes shielding plate and fixinig plate,
The slit is arranged on the shielding plate, and the fixinig plate is for being fixed the radical occlusion device.
10. radical occlusion device according to claim 7, which is characterized in that the hair of the radical occlusion device and the parallel laser
Penetrating has adjustable angle between face.
11. radical occlusion device according to claim 7, which is characterized in that the length of the slit is greater than the parallel laser
Width.
12. a kind of diameter measuring method of falling particles, which is characterized in that for swashing as claimed in any one of claims 1 to 6
In light raindrop spectrometer, which comprises
The parallel laser of the Laser emission end transmitting passes through the slit, and by portion on the thickness direction of the parallel laser
Divide and blocks；
The laser pick-off end receives the parallel laser across the slit, and detects the laser intensity of received parallel laser,
When judging that the laser intensity mutates, the diameter of falling particles is calculated according to the Sudden Changing Rate of the laser intensity.
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| CN114402758B (en) * | 2022-01-10 | 2023-01-03 | 安徽农业大学 | Seed sowing device with cavity light curtain scanning type miss-seeding detection function and miss-seeding detection method |
| CN119001136A (en) * | 2024-08-16 | 2024-11-22 | 杭州集普科技有限公司 | High-precision double-beam laser split correlation type velocimeter and velocimeter method thereof |
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