CN201225883Y - Practical digital speckle relevant test system instrument - Google Patents
Practical digital speckle relevant test system instrument Download PDFInfo
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- CN201225883Y CN201225883Y CNU2008200596166U CN200820059616U CN201225883Y CN 201225883 Y CN201225883 Y CN 201225883Y CN U2008200596166 U CNU2008200596166 U CN U2008200596166U CN 200820059616 U CN200820059616 U CN 200820059616U CN 201225883 Y CN201225883 Y CN 201225883Y
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Abstract
The utility model belongs to the technical field of the displacement or the stress measurement, and in particular relates to a digital speckle dependence test system instrument, which consists of a light source, a beam expanding lens, an image card, a computer and CCD, wherein, the light source aims at a measured object, and the reflection light of the measured object aims at the CCD, and the CCD loads the image information of the measured object into the computer through the image card, and the displacement or the stress can be calculated by the computer. The instrument is applied to the engineering displacement or the stress testing technology, and can precisely determine the displacement position or the stress value of the measured object.
Description
Technical field
The utility model belongs to the stress test technical field, is specifically related to a kind of digital speckle dependence test system instrument.
Background technology
Digital Speckle Correlation Method comes down to advanced image processing techniques and equipment, carries out direct digital processing by the digital gray scale to the original image (speckle field) of measurand, realizes the measurement of deformation of body field.It does not need testee is made particular processing, and the mode that raw data (image) is gathered is comparatively simple (common photographic means) also, and the environmental requirement of measurement is lower.Digital correlation method has the condition that can develop into a kind of measuring technique automatic, contactless, that have wide range of applications, can be described as one of main direction of following optical measurement mechanics development.
The basic thought that digital speckle is relevant is very similar to image recognition.Two speckle fields before and after its given deformation of body require to identify in the speckle field behind deformation of body that speckle subarea corresponding to a certain speckle subarea (sample) in the speckle field before the deformation of body.But this process is different with general image recognition again, and the background in the general image recognition around the image is very complicated, can't consider self changing of object.But in measurement of correlation, image background and identifying object thereof are fairly simple comparatively speaking, all are the light distribution corresponding with the material point of body surface, and its feature has only one, are exactly the light intensity of this material point, i.e. Dui Ying intensity profile.Utilize this point just, needn't carry out feature selecting and the feature extraction that to do in the common image recognition processes, but to consider that (as before and after the external force effect) under the different conditions is identified the variation of object self in when identification, that is to say, consider the distortion situation that research object under the different conditions (digital picture) is taken place, thereby the distortion of direct and object connects.
Summary of the invention
It is a kind of simple in structure, easy to use that the purpose of this utility model is to provide, and can obtain the practical digital speckle dependence test system instrument of testee displacement or strain.
The digital speckle dependence test system instrument that the utility model proposes, form by light source 1, beam expanding lens 2, image card 3, computing machine 4, CCD5 and measured object 6, wherein, light source 1 is aimed at the light inlet of beam expanding lens 2, the light-emitting window of beam expanding lens 2 is aimed at testee 6, the light-emitting window of measured object 6 is aimed at CCD5, and CCD5 connects image card 3, and the output terminal of image card 3 connects computing machine 4.
In the utility model, light source 1 adopts LASER Light Source or white light source.
The course of work of the present utility model is: monochromatic light that light source 1 sends or white light see through beam expanding lens 2, through entering CCD5 after the tested .6 reflection, promptly to the modulation intelligence that carries out of measured object 6 each points, this information also is stored in the computing machine 4 with the form of data, by of comparison and the computing of computing machine 4 existing softwares, obtain the displacement or the strain of testee at last to two width of cloth images before and after distortion or the displacement.
The beneficial effects of the utility model: digital correlation method converts the speckle field before and after the deformation of body to the digital speckle field by the digitizing video camera, handled object is out of shape former and later two digital speckle fields will be by means of image recognition technology, carry out the correlation analysis computing, digital speckle field before digital speckle field after the distortion and the distortion is compared, if selected suitable deformation pattern, the digital speckle field behind the deformation of body just can return to the preceding digital speckle field of distortion through digital conversion.It is a kind of noncontact area of computer aided measuring method that is used for in-plane displacement or deformation measurement.The method data acquisition modes is simple, processing automaticity height, the precision height, sensitivity is good, low to the experimental situation requirement, as long as white-light illuminating (yet can adopt laser) does not need strict laser interference light path, macroscopic view can realize long distance detecting, and microcosmic can be realized trickle displacement measurement, topography measurement etc.The result is generally sense of displacement and size, strain etc.Limitation is the distribution situation that generally can only obtain the displacement in the face, also needs suitable vibrating isolation system, as vibrationproof platform (especially microscopic measurement).If the speckle quality is good, this method is a kind of more satisfactory in-plane displacement measuring method.
Description of drawings
Fig. 1 is a structural diagrams of the present utility model.
Fig. 2 is the diagram before and after measured object 6 distortion among the embodiment 1.Wherein, (a) for before the distortion, (b) for after the distortion.
Number in the figure: 1 is light source, and 2 is beam expanding lens, and 3 is image card, and 4 is computing machine, and 5 is CCD, and 6 is measured object.
Embodiment
Further describe the utility model below by embodiment.
As shown in Figure 1, form by light source 1, beam expanding lens 2, image card 3, computing machine 4, CCD5, wherein, 1 pair of beam expanding lens 2 of light source, the light-emitting window of beam expanding lens 2 is aimed at testee 6, the light-emitting window of measured object 6 is aimed at CCD5, and CCD5 gets off to send into image card 3 with the displacement or the strain information of testee with front and back two width of cloth image recordings, and is stored in the computing machine by computing machine 5.
Said apparatus is used to detect simple three-point bending beam model, it is E=2.7e+09Pa that this measured object 6 adopts material, and the organic glass of μ=0.34 is made, and measured object 6 is a rectangular structure, it is long to be 5mm, wide is 5mm, and height is 12mm, and measured object 6 bears three-point bending, be the power that 9.8N is born at its top, the power that 9.8N is born at 20mm place, distance from bottom center, measured object 6 surfaces are made hacking and are handled, so that speckle information is more outstanding.
Light source 1 adopts the white light optical fiber lighting device to measured object 6 illuminations, and is even for making light field, adopts the optical fiber of bifurcated, makes white light from the incident of the right and left symmetry, and keeps being centered close on the same horizontal line of measured object 6, light source 1, CCD5.The white light source power that adopts is 100w; Beam expanding lens 2 adopts and focuses imaging mirror, clear aperature 1:1.8, f=50mm, C interface; CCD5 adopts digital CCD, maximum green 782 * 582Pixels, the frame frequency 30frame/sec of differentiating; 12V cable power supply on computing machine 5 mainboards, specially figure is as the card data line.To load the forward and backward digital picture of absorbing respectively, and again through the processing computing of image card 3, obtain the in-plane displacement field (and strain field) of three-point bending beam, the displacement of drawing at last (u field and v field) stereoscopic graticule trrellis diagram gets final product.
Claims (2)
1, a kind of practical digital speckle dependence test system instrument, form by light source (1), beam expanding lens (2), image card (3), computing machine (4), CCD (5), the light inlet that it is characterized in that light source (1) aligning beam expanding lens (2), the light-emitting window of beam expanding lens (2) is aimed at testee (6), the light-emitting window of measured object (6) is aimed at CCD (5), CCD (5) connects image card (3), and the output terminal of image card (3) connects computing machine (4).
2, practical digital speckle dependence test system instrument according to claim 1 is characterized in that light source (1) adopts mercury lamp light source or white light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200596166U CN201225883Y (en) | 2008-06-12 | 2008-06-12 | Practical digital speckle relevant test system instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200596166U CN201225883Y (en) | 2008-06-12 | 2008-06-12 | Practical digital speckle relevant test system instrument |
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| Publication Number | Publication Date |
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| CN201225883Y true CN201225883Y (en) | 2009-04-22 |
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| CNU2008200596166U Expired - Fee Related CN201225883Y (en) | 2008-06-12 | 2008-06-12 | Practical digital speckle relevant test system instrument |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655352B (en) * | 2009-09-15 | 2011-02-09 | 西安交通大学 | Measurement method of three-dimensional speckle strain measurement device |
| CN102168952A (en) * | 2010-12-27 | 2011-08-31 | 成都飞机工业（集团）有限责任公司 | Detection method and detection device of welding deformation |
| CN102735357A (en) * | 2012-06-25 | 2012-10-17 | 中北大学 | Temperature measuring device based on speckle interference and temperature measuring method adopting temperature measuring device |
| CN105300307A (en) * | 2015-11-20 | 2016-02-03 | 北京理工大学 | Device and method for optical mirror distortion measurement of relevant techniques of two-dimensional digital speckling |
| CN106885920A (en) * | 2016-12-26 | 2017-06-23 | 浙江科聪智能科技有限公司 | Contactless water speed measurement sensor, automation equipment, city river network intelligent monitor system |
| CN108489692A (en) * | 2018-03-14 | 2018-09-04 | 江苏省特种设备安全监督检验研究院 | A kind of measurement method and device of crane Static stiffness |
| CN109668780A (en) * | 2018-10-16 | 2019-04-23 | 南京林业大学 | A kind of continuous method for detecting internal strain distribution below oriented wood chipboard load-up condition |
| CN112525085A (en) * | 2020-12-10 | 2021-03-19 | 中南建筑设计院股份有限公司 | Node displacement and strain measurement method based on triangular gridding image technology |
| CN113251941A (en) * | 2021-06-17 | 2021-08-13 | 中国矿业大学(北京) | Ultrafast digital speckle system based on pulse laser and experimental method |
| CN116838319A (en) * | 2023-07-07 | 2023-10-03 | 中国矿业大学 | Full-environment drilling raw rock stress testing device and measuring method |
-
2008
- 2008-06-12 CN CNU2008200596166U patent/CN201225883Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655352B (en) * | 2009-09-15 | 2011-02-09 | 西安交通大学 | Measurement method of three-dimensional speckle strain measurement device |
| CN102168952A (en) * | 2010-12-27 | 2011-08-31 | 成都飞机工业（集团）有限责任公司 | Detection method and detection device of welding deformation |
| CN102735357A (en) * | 2012-06-25 | 2012-10-17 | 中北大学 | Temperature measuring device based on speckle interference and temperature measuring method adopting temperature measuring device |
| CN102735357B (en) * | 2012-06-25 | 2014-07-16 | 中北大学 | Temperature measuring device based on speckle interference and temperature measuring method adopting temperature measuring device |
| CN105300307B (en) * | 2015-11-20 | 2018-06-08 | 北京理工大学 | The optical mirror plane deformation measuring device and method of Two-Dimensional Speckle digital correlation techniques |
| CN105300307A (en) * | 2015-11-20 | 2016-02-03 | 北京理工大学 | Device and method for optical mirror distortion measurement of relevant techniques of two-dimensional digital speckling |
| CN106885920A (en) * | 2016-12-26 | 2017-06-23 | 浙江科聪智能科技有限公司 | Contactless water speed measurement sensor, automation equipment, city river network intelligent monitor system |
| CN108489692A (en) * | 2018-03-14 | 2018-09-04 | 江苏省特种设备安全监督检验研究院 | A kind of measurement method and device of crane Static stiffness |
| CN109668780A (en) * | 2018-10-16 | 2019-04-23 | 南京林业大学 | A kind of continuous method for detecting internal strain distribution below oriented wood chipboard load-up condition |
| CN109668780B (en) * | 2018-10-16 | 2022-06-07 | 南京林业大学 | Method for continuously detecting internal strain distribution of oriented strand board under load condition |
| CN112525085A (en) * | 2020-12-10 | 2021-03-19 | 中南建筑设计院股份有限公司 | Node displacement and strain measurement method based on triangular gridding image technology |
| CN113251941A (en) * | 2021-06-17 | 2021-08-13 | 中国矿业大学(北京) | Ultrafast digital speckle system based on pulse laser and experimental method |
| CN116838319A (en) * | 2023-07-07 | 2023-10-03 | 中国矿业大学 | Full-environment drilling raw rock stress testing device and measuring method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 Termination date: 20120612 |