CN107560709A

CN107560709A - A kind of vibration amplitude measurement method and measuring apparatus

Info

Publication number: CN107560709A
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: 2018-01-09
Anticipated expiration: 2037-08-11
Also published as: CN107560709B

Abstract

The embodiment of the present invention, which provides a kind of vibration amplitude measurement method and measuring apparatus, this method, may include：Grating fringe is projected 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, target striped corresponding to each target point difference in target membrane is determined, and obtain reference position information of each target striped in reference grating stripe pattern；According to the positional information of target projection point, target shooting point, reference planes and the target membrane to remain static, and reference position information, amplitude of the target membrane in each target point is calculated.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, lift measurement efficiency.

Description

A kind of vibration amplitude measurement method and measuring apparatus

Technical field

The present invention relates to communication technical field, more particularly to a kind of vibration amplitude measurement method and measuring apparatus.

Background technology

With the development of mobile Internet, electronic product is increasingly favored by 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 vital effect for the sounding of loudspeaker.In consideration of it, need to shake to speaker diaphragm Width measures.At present, prior art is mainly measured using single point laser mensuration to the amplitude of speaker diaphragm, should Method takes multiple measurements, it is necessary to devote a tremendous amount of time due to needing to speaker diaphragm.It can be seen that existing vibration amplitude measurement method In the presence of it is time-consuming excessive the problem of.

The content of the invention

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

In order to solve the above-mentioned technical problem, the present invention is realized in：A kind of vibration amplitude measurement method, for measuring a mesh The amplitude of diaphragm is marked, methods described includes：

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, target corresponding to each target point difference 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 positional information of diaphragm, and the reference position information are marked, calculates amplitude of the target membrane in each target point.

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

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；

Taking module, for having the reference planes of the grating fringe and the target 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 according to the target gratings strips print image, determining each target point in the target membrane Target striped corresponding to respectively, 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, reference planes and in static The positional 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 have a reference planes of grating fringe to projection and target membrane 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, and so, the vibration amplitude measurement method need not Each target point in the target membrane is measured respectively, reduces measurement duration so as to reach, lifting measurement effect The purpose of rate.

Brief description of the drawings

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 The required accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention Example is applied, for those of ordinary skill in the art, without having to pay creative labor, can also be attached according to these Figure obtains other accompanying drawings.

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

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

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

Fig. 8 is a kind of structural representation of measuring apparatus provided in an embodiment of the present invention；

Fig. 9 is the structural representation of another measuring apparatus provided in an embodiment of the present invention；

Figure 10 is the structural representation of another measuring apparatus provided in an embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.

Referring to Fig. 1, Fig. 1 is a kind of schematic flow sheet 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, from target projection point to reference planes and target membrane grating fringe is projected 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, and it 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 it is acted on mainly provides reference bit confidence to calculate the amplitude of each point in the target membrane Breath.

Above-mentioned grating fringe can be projected by rastering laser projecting apparatus 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, can be by the grating Laser-projector first projects the grating fringe from the target projection point to the reference planes, then is thrown to the target membrane The grating fringe is penetrated, wherein, if the reference planes are located at the top of the target membrane, thrown to the target membrane Penetrate before the grating fringe, first can 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, can before the grating fringe is projected to the reference planes So that 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 State to reflect in reference planes and the target membrane and have 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 being reflected in the reference planes Striped come confirm each target point correspond to the reference planes on reference stripe position.

Step 102, from target shooting point to projection have the reference planes of the grating fringe and the target membrane 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 from upper by photographing device (such as video camera) 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 effect, the striped corresponded in the target membrane in the target gratings strips print image is sinuate modified strip Line, such as：As shown in Figures 2 and 3, wherein in Fig. 2 it is reference grating stripe pattern schematic diagram, Fig. 3 is target grating fringe figure As schematic diagram.Further, since the target membrane is vibrated with certain frequency, thus the photographing device can use it is higher Frame per second, to photograph more clearly target gratings strips print image, so as to ensure 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 State target membrane to be shot respectively, can be after optical grating projection instrument projects grating fringe to the reference planes, by imaging Machine is shot from the target shooting point to the reference planes, so as to obtain the reference grating stripe pattern, then in light After grid projecting apparatus projects grating fringe to the target membrane, the target membrane is entered from the target shooting point by video camera Row shooting, so as to obtain the target gratings strips print image.

In the step, by having the reference planes of the grating fringe and the target to projection from target shooting point Diaphragm is shot respectively, reference grating stripe pattern and target gratings strips print image can be obtained, 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 reference stripe corresponding to 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 the point that vibrational state is in the target membrane, above-mentioned According to the target gratings strips print image, determine each target point in the target membrane respectively corresponding to target striped, 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 on diaphragm, and the target area, determine that each target point corresponds to phase in the target gratings strips print image The position that should be put, the striped where the point is finally defined as the target striped corresponding to respective objects point.

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 positional 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 relation of middle striped, if institute's grating fringe covering target membrane is consistent with the scope of the reference planes, and clap The reference grating stripe pattern for taking the photograph to obtain is consistent with the striped quantity in the target gratings strips print image, then can be direct Than against two amplitude grating stripe patterns, to determine corresponding with each target striped respectively in the ginseng grating fringe image to refer to bar 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 Striped wherein corresponding to a stripe in print image, so can determine it is described ginseng grating fringe image in respectively with each target Reference stripe corresponding to striped.

So, in the step, by determining target striped corresponding to the difference of each target point in the target membrane, and Obtain reference position information of each target striped in the reference grating stripe pattern, it may be determined that in the target membrane Positional 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 positional informations Each target point on diaphragm is marked in vibration in the offset in x directions, wherein, the x directions are vertical with grating fringe Direction, as shown in the direction of arrow in Fig. 2.

Step 104, according to the target projection point, the target shooting point, the reference planes and remain static The target membrane positional information, and the reference position information calculates 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 target projection point and the positional information of the target shooting point, it may be determined that the target projection point with it is described The horizontal range d of target shooting point, according to the reference planes and the positional information of the target membrane to remain static, The vertical range s of the reference planes and the target membrane can be determined, further, it is also possible to determine the target projection point with The vertical range l of the reference planes.So, according to parameter d, s and l, and each target point is 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, amplitude of the target membrane in each target point can be calculated.

Specifically, the target can be determined by the target projection point and the positional information of the target shooting point Subpoint and the horizontal range reference baseline of the target shooting point, and determine some target point to be measured to the reference baseline Distance, further according to the positional information of the target point and target projection point, determine throw light corresponding to the target point, and root The positional information of reference point is determined 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, the corresponding calculating reference model of foundation (such as：Such as Fig. 4 institutes Show), Similar Principle of Triangle is recycled, such as：Principle (the two triangles similar with BP'F triangle BPE in Fig. 4 The ratio of two right angle length of sides of shape is equal), or the principle (base of the two triangles that triangle BCP' is similar with PGP' It is equal with high ratio), the calculation formula related to the amplitude of the target point can be obtained, is believed finally by each parameter is substituted into Breath, the amplitude of the target point can be calculated.

So, in the step, the target projection point, the target shooting point, reference planes and in quiet are passed through The only positional information of the target membrane of state, and the reference position information, can calculate the target membrane at certain The amplitude of individual target point, all in the target gratings strips print image it is located at institute so as to according to same principle, calculate State the amplitude of the target point in target membrane.Compared in the prior art respectively to each target click-through in the target membrane 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 as to which largely Shangdi reduces measurement duration, greatly improves survey Amount efficiency, and the amplitude data for each point being calculated is by fore-and-aft survey difference due to not influenceed, the precision of measurement data Obtain certain lifting.

It should be noted that in the embodiment of the present invention, step 103 and step 104 can be by the rear ends in high-speed camera Chip is completed or by the target gratings strips print image and the reference grating stripe pattern, and the target Subpoint, the target shooting point, the positional information of the reference planes and the target membrane to remain static are all defeated Enter into 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 schematic flow sheet 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.The embodiment on the basis of the embodiment shown in Fig. 1, to it is described from target shooting point to throw Penetrate the reference planes of the grating fringe and refined the step of the target membrane is shot respectively, and it is right The mode of calculated amplitude has carried out corresponding refinement.As shown in figure 5, it the described method comprises the following steps：

Step 501, from target projection point with first angle grating fringe is projected respectively to reference planes and target membrane, its 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 of camera lens institute of the equipment of the grating fringe State reference planes or the target membrane that remains static where plane angle, wherein, the first angle is can With what is be adjusted in advance, to ensure that the grating fringe that is projected from the target projection point with the first angle can be with Project in the reference planes and the target membrane, or even allow the grating fringe that the target film is completely covered Piece, the amplitude of the more multiple target points gone out so as to one-shot measurement in the target membrane, even all target points shake Width.

It is above-mentioned that the specific of grating fringe is projected with first angle respectively to reference planes and target membrane 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 Repeat again.

Optionally, the width in the grating fringe per stripe is identical and spacing is equal.

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

It should be noted that the embodiment can also be implemented with reference to the embodiment shown in Fig. 1.

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

In the embodiment, the area of the reference planes can be more than the area of the target membrane, so, when described When the target membrane is completely covered in grating fringe, every grating fringe being 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, the reference planes for having the grating fringe to projection from target shooting point with second angle are carried out 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 direction of the court of camera lens institute of equipment and the folder of the plane where the reference planes or the target membrane to remain static Angle, wherein, the second angle can be adjusted in advance, to ensure from the target shooting point with the second angle Projection, which can be photographed, the reference planes of the grating fringe, so as to obtain reference grating stripe pattern, it might even be possible to Make 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, and can obtain reference grating stripe pattern, and the method that its embodiment may refer to shown in Fig. 1 is implemented Related embodiment in example described in step 102, to avoid repeating, is repeated no more here.

Step 503, from the target shooting point there is the grating fringe to projection with the second angle and preset frame rate The target membrane be continuously shot, to obtain the coherent target gratings strips print image of some frames, wherein, the default frame Rate matches 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 State target membrane to be continuously shot, can be photographing device (such as video camera) use and the vibration frequency of the target membrane The frame per second matched somebody with somebody simultaneously is continuously shot from the target shooting point with the second angle to the target membrane, if so as 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 match with the vibration frequency of the target membrane, it can be understood as the bat that the photographing device uses Take the photograph frame per second be according to the vibration frequency of the target membrane come default, specifically, the frame rate that the photographing device uses 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., described to raise one's voice The vibration in every 0.00005 second of device diaphragm once, can now use frame per second to be raised one's voice for 40000 frames high-speed camera per second to described Device diaphragm is shot, i.e., described every 0.000025 second beats of high-speed camera takes the photograph a frame picture, and so, the high-speed camera exists Two frame pictures can be photographed in 0.00005 second, and the mesh on the speaker diaphragm can be calculated by this two frames picture Punctuate vibrates to the amplitude during top of original position and vibrated to the amplitude during lower section of original position in once vibrating.

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

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

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 Shot with the target membrane, be all equidistant through shooting every stripe in obtained reference grating stripe pattern so 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, determine that each target point in the target membrane corresponds respectively to every frame target gratings strips print image In target striped, and each target striped in obtaining respectively per frame target gratings strips print image is in the reference grating bar graph Reference position information as in.

, can be one by one for the target gratings strips print image that some frames for shooting to obtain in step 503 are coherent in the step The target striped that each target point in the target membrane is corresponded respectively in every frame target gratings strips print image is determined, and The reference position per each target striped in frame target gratings strips print image in the reference grating stripe pattern is obtained respectively Information, it may thereby determine that position letter of each target point in the target membrane in every frame target gratings strips print image Cease, and distinguish the reference position information of corresponding reference stripe with each target point in the reference grating stripe pattern, So as to be determined each target point in the target membrane in every frame target grating fringe figure according to the two positional informations In the offset in x directions as in.

It should be noted that in the step, determine that each target point in the target membrane corresponds respectively to each frame 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 embodiment of the method shown in the embodiment and Fig. 1 of reference position information in reference grating stripe pattern Embodiment it is similar, to avoid repeating, repeat no more here.

Step 505, according to the target projection point, the target shooting point, the reference planes and remain static The target membrane positional information, and per frame target gratings strips print image in each target striped in the reference grating Reference position information in stripe pattern, calculate respectively per target membrane described in frame target gratings strips print image in each target The amplitude of point.

In the step, each target striped in the 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, calculate exist per target membrane described in frame target gratings strips print image respectively The amplitude of each target point, so, due to every frame target gratings strips print image reflect respectively it is each in the target membrane Amplitude of the target point when diverse location is arrived in vibration at different moments, therefore, in the step, by calculating per frame target grating fringe Target membrane described in image can obtain each target point in the target membrane in difference in the amplitude of each target point The vibrational state at moment, so as to comprehensively obtain the vibration characteristics of the target membrane.

It should be noted that in the step, calculate per target membrane described in frame target gratings strips print image in each mesh The embodiment of the amplitude of punctuate is similar with the embodiment of step 104 in the embodiment of the method shown in Fig. 1, to avoid weight It is multiple, repeat no more here.

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, the target projection point and the target shooting point is set to be located on same target level line, and The target level line is parallel with the reference planes, so, according to the target projection point and the position of the target shooting point Confidence ceases, and it is the horizontal range of the target projection point and the target shooting point that can directly determine both air line distance 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 target membrane of the reference planes with remaining static is more than or equal to The peak swing of the target membrane.

In the embodiment, the vertical range s of the target membrane of the reference planes with remaining static is more 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, in the target membrane amplitude of target point beyond the reference planes and the target membrane distance s, So as to cause when establishing the amplitude for calculating reference model and calculating some target point, it is necessary to which point situation calculates shaking for the point Width, i.e., it 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 Should ground calculating.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 exactly obtain Obtain amplitude of the target membrane in each target point.

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

It should be noted that in the embodiment of the present invention, the distance of the target projection point and the target shooting point can be with It is in the first preset range and as small as possible, to ensure 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 distance in the 3rd preset range so that photographing device can photograph the target film All grating fringes projected on piece, the distance of the reference planes and the target membrane in the range of the 4th pre-determined distance, , so, not only can be with so that the reference grating stripe pattern is consistent with the striped quantity in the target gratings strips print image The target gratings strips print image for ensureing once to shoot to obtain can reflect 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 the 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 Embodiment also add the embodiment of plurality of optional on the basis of the 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, lift the technology effect of measurement efficiency Fruit.

Referring to Fig. 6, Fig. 6 is the schematic flow sheet 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.The embodiment is on the basis of the embodiment shown in Fig. 1, to how to calculate the target membrane Refined in the mode of the amplitude of each target point.As shown in fig. 6, it the described method comprises the following steps：

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

The embodiment of the step may refer to the embodiment of step 101 in embodiment of the method shown in Fig. 1, be Avoid repeating, repeat no more here.

Step 602, from target shooting point to projection have the reference planes of the grating fringe and the target membrane Shot respectively, to obtain reference grating stripe pattern and target gratings strips print image.

The embodiment of the step may refer to the embodiment of step 102 in embodiment of the method shown in Fig. 1, be Avoid repeating, repeat no more here.

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 embodiment of the step may refer to the embodiment of step 103 in embodiment of the method shown in Fig. 1, be Avoid repeating, repeat no more here.

Optionally, it is 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, including：

The sequence number in the target gratings strips print image per stripe, and the reference light grizzly bar are determined by preset order Sequence number in print image per stripe, and the striped established in the target gratings strips print image and the reference grating bar graph The sequence number corresponding relation of striped as in；

Determine each mesh that each target point in the target membrane is corresponded respectively in the target gratings strips print image Mark the sequence number of striped；

According to the sequence number corresponding relation, determine in the reference grating stripe pattern sequence 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 can preset an order according to the arrangement mode of the grating fringe, such as：Refer to Fig. 7, after the orientation target membrane 703 of rastering laser projecting apparatus 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 order from right to left.

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

In addition, also need to determine the sequence number of every stripe in the reference grating stripe pattern, example by same preset order Such as：Every stripe in reference grating stripe pattern shown in Fig. 2 is subjected to sequence number mark by order from left to right, can be obtained Into the reference grating stripe pattern shown in Fig. 2 the sequence number of every black streaking be followed successively by 1 by order from left to right, 2,3,4,5, 6th, 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 Sequence number corresponding relation, can be that the reference grating is first extrapolated according to distance of the reference planes away from the target membrane Reference data striped corresponding with the reference stripe in the target gratings strips print image, then obtains the mesh in stripe pattern Mark the sequence number of reference stripe described in grating fringe image, and reference data striped described in the reference grating stripe pattern Sequence number, and establish the sequence number corresponding relation of this two stripe, finally, can be by other in the target gratings strips print image Line is relative to the position of the reference stripe, and other stripeds refer to base relative to described in the reference grating stripe pattern The position of floating screed line, establish corresponding sequence number corresponding relation.

Such as：If the grating fringe covering target membrane is consistent with the scope of the reference planes, and shoot The obtained reference grating stripe pattern is consistent with the striped quantity in the target gratings strips print image, now may refer to Fig. 2 and Fig. 3, wherein, in the reference grating stripe pattern shown in Fig. 2 the sequence number of every black streaking by from left to right order successively It is suitable by from left to right for the sequence number of every black streaking in the target gratings strips print image shown in 1,2,3,4,5,6,7 and 8, Fig. 3 Sequence is followed successively by 1,2,3,4,5,6,7 and 8, and so, the sequence number corresponding relation of foundation is sequence number in the target gratings strips print image The black streaking of serial number 1 in the reference grating stripe pattern is corresponded to for 1 black streaking, sequence in the target gratings strips print image Number correspond to the black streaking of serial number 2 in the reference grating stripe pattern for 2 black streaking, the corresponding of other several stripes is closed Be similar, i.e., a pair of sequence number identical striped 1 in described target gratings strips print image and the reference grating stripe pattern Should.

Each target point in the above-mentioned determination target membrane is corresponded respectively in the target gratings strips print image The sequence number of each target striped, can first determine that each target point in the target membrane corresponds respectively to the target grating Each target striped in stripe pattern, further according to the sequence number in the fixed target gratings strips print image per stripe, obtain Take the sequence number of each target striped.

It is above-mentioned according to the sequence number corresponding relation, determine in the reference grating stripe pattern sequence number respectively with each target bar The reference stripe of the order number matches of line, can be that the sequence with each target striped respectively is searched from the sequence number corresponding relation established Number matching reference number, corresponding reference stripe is then found 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 it is determined that In the reference grating stripe pattern sequence number respectively with after the reference stripe of the order number matches of each target striped, by each reference stripe Positional information in the reference grating stripe pattern is respectively as reference position information corresponding to respective objects point.

So, in the embodiment, by establishing the striped in the target gratings strips print image and the reference grating The sequence number corresponding relation of striped in stripe pattern, reference stripe corresponding with each target striped can be rapidly and accurately determined, And then it can rapidly and accurately obtain reference position information corresponding to the difference of each target point in the target membrane.

Step 604, pass through formula A=l-l (d-x₁)/(d-x₂)-s calculating target membrane the shaking in each target point Width；

Wherein, d represents the target projection point and the horizontal range of the target shooting point, and l represents the target projection Point and the vertical range of the projection plane, s represent the vertical of the reference planes and the target membrane to remain static Straight distance, x₁Represent some target point in the target gratings strips print image in the coordinate value in x-axis direction, x₂Represent and the mesh Target striped corresponding to punctuate represents the target in the reference grating stripe pattern in the coordinate value in the x-axis direction, A 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 represents the vertical range of the reference planes and the target membrane to remain static, and can use just Negative represents the orientation of the reference planes and the target membrane, such as：If as shown in figure 4, the target membrane is located at The top of the reference planes, now s is represented with positive number, if the opposite target membrane is located at the lower section of the reference planes, Now s negative number representations, if the reference planes are located at approximately the same plane with the target membrane, now s is zero.

It should be noted that A result of calculation has just and has negative, represent the target membrane in the vibration side of some target point To for up or down, such as：The target projection point, the target shooting point, the target membrane and the reference planes If position as shown in figure 4, result of calculation A for just, then it represents that the target membrane is vibrated upwards, if result of calculation A is negative, Represent that the target membrane is vibrated downwards in some target point.

Below in conjunction with Fig. 4 and Fig. 7, computational methods of the target membrane in the amplitude of each target point are illustrated Illustrate, wherein, Fig. 4 is the position according to the rastering laser projecting apparatus 701 shown in Fig. 7, video camera 702 and target membrane 703 The calculating reference model that relation obtains, the target membrane 703 are located at the rastering laser projecting apparatus 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 Mark shooting point C horizontal range 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 target projection point B and the reference planes N vertical range are l, wherein, with the x-axis shown in scheming, Y-axis, z-axis and origin O form 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=x_i, FC=x₂

Therefore it can obtain

Wherein, x₁Represent P points in the target gratings strips print image in the coordinate value in x-axis direction, x₂Represent that P points are corresponding Target striped in the reference grating stripe pattern in the coordinate value in the x-axis direction, A represents the target membrane in P The amplitude of point.

So, in the step, formula A=l-l (d-x are passed through₁)/(d-x₂)-s, it can rapidly calculate the target film Piece P points 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 to calculate the target membrane in each target on the basis of the embodiment shown in Fig. 1 The mode of the amplitude of point is refined, so that the target membrane is clearer in the calculation of the amplitude of each target point Understand.In addition, the present embodiment also add the embodiment of plurality of optional on the basis of the 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, lifting measurement effect The technique effect of rate.

Referring to Fig. 8, Fig. 8 is a kind of structural representation for measuring apparatus that the present invention implements offer, for measuring a mesh The amplitude of diaphragm is marked, as shown in figure 8, measuring apparatus 800 includes：

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

Taking module 802, for there is 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 according to the target gratings strips print image, determining each target in the target membrane Target striped corresponding to point difference, 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 positional information of the target membrane of inactive 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 taking 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 some frames, its In, the preset frame rate matches with the vibration frequency of the target membrane；

The determining module 803 is used to determine that each target point in the target membrane corresponds respectively to every frame target light Target striped in grizzly bar print image, and obtain respectively per each target striped in frame target gratings strips print image 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 In the positional information of the target membrane of inactive state, and per each target striped in frame target gratings strips print image in phase Reference position information in the reference grating stripe pattern answered, calculate respectively per target film described in 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 determining unit 8031, for determining the sequence in the target gratings strips print image per stripe by preset order Number, and the sequence number in the reference grating stripe pattern per stripe, and the bar established in the target gratings strips print image The sequence number corresponding relation of line and the striped in the reference grating stripe pattern；

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

3rd determining unit 8033, for according to the sequence number corresponding relation, determining in the reference grating stripe pattern The sequence 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 apparatus 800 provided in an embodiment of the present invention can be realized to measure in Fig. 1, Fig. 5 and Fig. 6 embodiment of the method and set The standby each process realized, to avoid repeating, is repeated no more here.Measuring apparatus 800 can once calculate the target film The amplitude of the target point in a face on piece, so as to reduce measurement duration, lift measurement efficiency.

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

Video camera 702, for having the reference planes of the grating fringe and the mesh to projection from target shooting point 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 for the amplitude for calculating each target point in the target membrane 703.

Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel Described function can be realized using distinct methods to each specific application, 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, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.

In embodiment provided herein, it should be understood that disclosed apparatus and method, others can be passed through Mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, is only A kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, device or unit Connect, can be electrical, mechanical or other forms.

The unit illustrated as separating component can be or may not be physically separate, show as unit The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs 's.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also That unit is individually physically present, can also two or more units it is integrated in a unit.

If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention. And foregoing storage medium includes：USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can be with store program codes Medium.

The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.

Claims

A kind of 1. vibration amplitude measurement method, for measuring the amplitude of a target membrane, it is characterised in that including：

Grating fringe is projected respectively from target projection point to reference planes and target membrane, wherein, the reference planes are with being in Plane where the target membrane of inactive 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, target bar corresponding to each target point difference 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 positional information of piece, and the reference position information, calculate amplitude of the target membrane in each target point.
2. according to the method for claim 1, it is characterised in that described from target projection point to reference planes and target membrane The step of projecting grating fringe respectively, including：

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

It is described to there is 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, including：

The reference planes for having the grating fringe to projection from target shooting point with second angle are shot, 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 some frames, wherein, the preset frame rate and the target The vibration frequency matching of diaphragm；

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

The target striped that each target point in the target membrane is corresponded respectively in every frame target gratings strips print image is determined, And the reference bit per each target striped in frame target gratings strips print image in the reference grating stripe pattern is obtained respectively Confidence ceases；

It is described according to the target projection point, the target shooting point, the reference planes and the mesh to remain static The positional information of diaphragm, and the reference position information are marked, calculates step of the target membrane in the amplitude of each target point Suddenly, including：

According to the target projection point, the target shooting point, the reference planes and the target film to remain static The positional information of piece, and per each target striped in frame target gratings strips print image in the reference grating stripe pattern Reference position information, calculate respectively per target membrane described in frame target gratings strips print image in the amplitude of each target point.
3. according to the method for claim 1, it is characterised in that described to be shot according to the target projection point, the target The positional information of point, 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, including：

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

Wherein, d represents the target projection point and the horizontal range of the target shooting point, l represent the target projection point with The vertical range of the projection plane, s represent the reference planes it is vertical with the target membrane that remains static away from From x₁Represent some target point in the target gratings strips print image in the coordinate value in x-axis direction, x₂Represent and the target point Corresponding target striped represents the target membrane in the reference grating stripe pattern in the coordinate value in the x-axis direction, A In the amplitude of the target point.
4. according to the method any one of claim 1-3, it is characterised in that the target projection point and the target are clapped Take the photograph a little on same target level line, the target level line is parallel with the reference planes.
5. according to the method any one of claim 1-3, it is characterised in that the reference planes are with remaining static The target membrane vertical range be more than or equal to the target membrane peak swing.
6. the method according to claim 1 or 3, it is characterised in that it is described according to the target gratings strips print image, it is determined that Target striped corresponding to each target point difference 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, including：

The sequence number in the target gratings strips print image per stripe, and the reference grating bar graph are determined by preset order Sequence number as in per stripe, and establish in the striped in the target gratings strips print image and the reference grating stripe pattern Striped sequence number corresponding relation；

Determine each target bar that each target point in the target membrane is corresponded respectively in the target gratings strips print image The sequence number of line；

According to the sequence number corresponding relation, the sequence number sequence number with each target striped respectively is determined in the reference grating stripe pattern The reference stripe of matching；

Obtain reference position information of each reference stripe in the reference grating stripe pattern.
A kind of 7. measuring apparatus, for measuring the amplitude of a target membrane, it is characterised in that including：

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；

Taking module, for having the reference planes of the grating fringe and the target membrane to projection from target shooting point 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 each target point difference 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 positional information, and the reference position information calculates the target membrane in each target point Amplitude.
8. measuring apparatus according to claim 7, it is characterised in that the projection module is used for from target projection o'clock with the One angle projects grating fringe respectively to reference planes and target membrane；

The taking 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 some frames, wherein, it is described pre- If frame per second matches with the vibration frequency of the target membrane；

The determining module is used to determine that each target point in the target membrane corresponds respectively to every frame target grating fringe Target striped in image, and obtain respectively per each target striped in frame target gratings strips print image 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, reference planes and in static The positional information of the target membrane of state, and per each target striped in frame target gratings strips print image in the reference Reference position information in grating fringe image, calculate respectively per target membrane described in frame target gratings strips print image each The amplitude of target point.
9. measuring apparatus according to claim 7, it is characterised in that the computing module is used to pass through formula A=l-l (d-x₁)/(d-x₂)+s calculates the amplitude of the target membrane in each target point；

Wherein, d represents the target projection point and the horizontal range of the target shooting point, l represent the target projection point with The vertical range of the projection plane, s represent the reference planes it is vertical with the target membrane that remains static away from From x₁Represent some target point in the target gratings strips print image in the coordinate value in x-axis direction, x₂Represent and the target point Corresponding target striped represents the target membrane in the reference grating stripe pattern in the coordinate value in the x-axis direction, A In the amplitude of the target point.
10. according to the measuring apparatus any one of claim 7-9, it is characterised 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. according to the measuring apparatus any one of claim 7-9, it is characterised in that the reference planes are with being 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 apparatus according to claim 7 or 9, it is characterised in that the determining module includes：

First determining unit, for determining the sequence number in the target gratings strips print image per stripe by preset order, and In the reference grating stripe pattern per stripe sequence number, and the striped established in the target gratings strips print image with it is described The sequence number corresponding relation of striped in reference grating stripe pattern；

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

3rd determining unit, for according to the sequence number corresponding relation, determining that sequence 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.