CN107131842A - A kind of noncontact whole audience strain measurement method under water - Google Patents
A kind of noncontact whole audience strain measurement method under water Download PDFInfo
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- CN107131842A CN107131842A CN201710498131.0A CN201710498131A CN107131842A CN 107131842 A CN107131842 A CN 107131842A CN 201710498131 A CN201710498131 A CN 201710498131A CN 107131842 A CN107131842 A CN 107131842A
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- under water
- camera
- measurement method
- noncontact
- whole audience
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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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Abstract
The invention discloses a kind of noncontact whole audience strain measurement method under water, speckle pattern is designed by MATLAB or Adobe Photoshop CS first, printed on water-transfer printing paper line, pass through water-transfer printing paper line to object under test surface, the speckle image before and after immersed body deformation is shot by underwater photographic system again, last computer obtains immersed body whole field deformation figure by digital speckle software processing speckle image.The present invention, which is realized, can obtain whole audience strain to immersed body noncontact；By the way that designed speckle pattern under water is transferred into object under test surface so that test more facilitates, inexpensively, can be widely applied to Experiments of Machanics under water, including aircraft under water, the online strain monitoring in field such as underwater concrete.
Description
Technical field
The invention belongs to strain measurement technique under water, and in particular to a kind of noncontact whole audience strain measurement method under water.
Background technology
Chinese patent 201310097955.9 discloses a kind of non-contact plane strain measurement method, and this method is by three
Individual optical mouse chip constitutes sensor, and sensor is pasted into body surface, the coordinate value of three optical mouse chips is utilized
To calculate strain value.But this method can only test object single-point strain, it is impossible to measure the object whole audience strain；On the other hand pass
It is unrealistic that sensor pastes immersed body surface, operates more difficult accomplishes.
Current strain measurement be unable to do without strain transducer.Whether existing strain transducer, contacted that to be divided into two big by measurement
Class：（1）Touch sensor：Such as resistance strain gage, extensometer, fiber-optic grating sensor.This kind of sensor is contact type measurement,
It is general to require that sensor is in close contact with object, and require that sensor principal strain directions and object should change direction unanimously.（2）It is non-
Touch sensor：Optical measuring system such as based on speckle measurement principle.
Strain of the Luo Zhihua in application ultrasound speckle correlation measurement thing under water（Central China University of Science and Technology's journal）In one text, carry
A kind of measuring system of ultrasound speckle correlation technique measurement body surface strain is gone out, by it with silicone rubber test pieces table under water
Face strain measurement, but measurement error reaches 7%, error must coordinate multiple focusing probe ability comparatively than larger
The requirement of whole audience strain is realized, experimentation is more complicated, inconvenient.
The content of the invention
It is an object of the invention to provide a kind of noncontact whole audience strain measurement method under water, solving can not measure under water
The problem of whole audience is strained.
The technical solution for realizing the object of the invention is：A kind of noncontact whole audience strain measurement method, measurement side under water
Method step is as follows：
Step 1, designed speckle pattern printed on water-transfer printing paper line, pass through water-transfer printing paper line to determinand body surface
Face；
Step 2, pass through underwater photographic system shoot immersed body deformation before and after speckle image；
Step 3, computer obtain immersed body whole field deformation figure by digital speckle software processing speckle image.
The underwater photographic system include binocular camera, camera case, 2N camera light, two panels optical glass, two it is perpendicular
To support arm and two rolling bearings, wherein N >=3, camera case front is arranged with two through holes, and optical glass is fixed on above-mentioned
In through hole, the housing of sealing waterproof is constituted, the N number of camera light of each circular hole outer ring annular spread, binocular camera is fixed on camera shell
In vivo, two camera lenses of binocular camera are respectively aligned to its corresponding optical glass, and two vertical support arms pass through rolling bearing respectively
Camera case top surface is fixed on, binocular camera is connected with the computer of step 3.
Speckle pattern is designed in step 1 and uses MATLAB or Adobe Photoshop CS.
The digital speckle software uses GOM Correlate.
Compared with prior art, its remarkable advantage is the present invention：（1）Realize and immersed body noncontact can obtain
The whole audience is strained；（2）By the way that designed speckle pattern under water is transferred into object under test surface so that test more facilitates, inexpensively,
Experiments of Machanics under water, including aircraft under water can be widely applied to, the online strain monitoring in field such as underwater concrete.
Brief description of the drawings
Fig. 1 is the flow chart of noncontact of the present invention whole audience strain measurement method under water.
Fig. 2 is underwater photographic system overall structure diagram of the present invention.
Fig. 3 is the speckle figure structure schematic representation that MATLAB of the present invention is designed.
Fig. 4 is the speckle figure structure schematic representation that Adobe Photoshop CS6 of the present invention are designed.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 1, a kind of noncontact whole audience strain measurement method under water, it is characterised in that method and step is as follows：
Step 1, designed speckle pattern printed on water-transfer printing paper line, pass through water-transfer printing paper line to determinand body surface
Face；
Step 2, pass through underwater photographic system shoot immersed body deformation before and after speckle image；
Step 3, computer obtain immersed body whole field deformation figure by digital speckle software processing speckle image.
With reference to Fig. 2, the underwater photographic system in step 2 includes binocular camera 1, camera case 4,2N camera light 3, two panels
Optical glass 2, wherein two vertical support arms 5 and two rolling bearings 6, N >=3, the front of camera case 4 are arranged with two and led to
Hole, optical glass 2 is fixed in above-mentioned through hole, constitutes the housing of sealing waterproof.The N number of camera light of each circular hole outer ring annular spread
3, binocular camera 1 is fixed in camera case 4, and two camera lenses of binocular camera 1 are respectively aligned to its corresponding optical glass 2, is led to
Cross camera light 3 and light filling is carried out to binocular camera 1, two vertical support arms 5 are fixed on camera case 4 by rolling bearing 6 respectively and pushed up
Face, the vertical top surface of support arm 5 is connected support frame, and for fixing underwater photographic system, rolling bearing 6 can adjust the bat of camera case 4
Take the photograph angle.Binocular camera 1 is connected with the computer of step 3.
Speckle pattern is designed in step 1 and uses MATLAB or Adobe Photoshop CS.
The digital speckle software uses GOM Correlate.
The binocular camera 1 is MT9J003 model sensor lenses, and pixel is level：1.67 μm, vertically：1.67 µm.
The camera light 3 uses LED.
The vertical support arm 5 is carbon fiber pipe.
With reference to Fig. 3, the speckle pattern designed using MATLAB, the object big for measurement range, according to formula I (i, j)=
Sum [I0*exp (- ((i-x (k)) ^2+ (j-y (k)) ^2)/a^2)], wherein width i=3024 of speckle pattern, the length of speckle pattern
J=4032, I (i, j) represents speckle point distribution map, and k is expressed as speckle point number, and it is speckle size to take 15000, a, takes 5, the I0 to be
Luminous intensity, takes 2, using Gaussian Profile method, and x (k) is the abscissa of speckle point, and y (k) is the ordinate of speckle point, is drawn scattered
Spot figure, is printed on water-transfer printing paper, then passes through water-transfer printing paper line to object under test surface.
With reference to Fig. 4, pass through Adobe Photoshop CS（Such as Adobe Photoshop CS6）The speckle pattern of design,
The object small for measurement range, initially sets up canvas size for 1800 × 2800mm, then according to artificial spray painting figure, uses high score
Resolution camera shoots spray painting figure, using Adobe Photoshop CS figure layer instruments, replicates the figure layer of artificial spray painting figure to newly-built
White background painting canvas, then using pattern be superimposed, while using paintbrush modify be superimposed complete pattern, scaling regulation pattern magnitude,
Speckle pattern is drawn, is printed on water-transfer printing paper, passes through water-transfer printing paper line to object under test surface.
Through experiment, by water-transfer printing paper line to the speckle pattern on object under test surface be placed in water at least 2 weeks will not breakage or
Disappear.
Advantage of the present invention is as follows：Whole audience strain measurement method compensate for traditional foil gauge under water for noncontact of the present invention
The deficiency of measuring method, can realize the research of mechanical test under water, and the monitoring for immersed body whole field deformation in engineering is carried
Good method is supplied, with engineering significance.
Claims (7)
1. a kind of noncontact whole audience strain measurement method under water, it is characterised in that measuring method step is as follows：
Step 1, designed speckle pattern printed on water-transfer printing paper line, pass through water-transfer printing paper line to determinand body surface
Face；
Step 2, pass through underwater photographic system shoot immersed body deformation before and after speckle image；
Step 3, computer obtain immersed body whole field deformation figure by digital speckle software processing speckle image.
2. noncontact according to claim 1 whole audience strain measurement method under water, it is characterised in that：The underwater camera system
System includes binocular camera（1）, camera case（4）, 2N camera light（3）, two panels optical glass（2）, two vertical support arms（5）With
Two rolling bearings（6）, wherein N >=3, camera case（4）Front is arranged with two through holes, optical glass（2）It is fixed on
State in through hole, constitute the housing of sealing waterproof, the N number of camera light of each circular hole outer ring annular spread（3）, binocular camera（1）It is fixed
In camera case（4）It is interior, binocular camera（1）Two camera lenses be respectively aligned to its corresponding optical glass（2）, two vertical support arms
（5）Pass through rolling bearing respectively（6）It is fixed on camera case（4）Top surface, binocular camera（1）It is connected with the computer of step 3.
3. noncontact according to claim 2 whole audience strain measurement method under water, it is characterised in that：The binocular camera
（1）For MT9J003 model sensor lenses, pixel is level：1.67 μm, vertically：1.67 µm.
4. noncontact according to claim 2 whole audience strain measurement method under water, it is characterised in that：The camera light（3）
Using LED.
5. noncontact according to claim 2 whole audience strain measurement method under water, it is characterised in that：The vertical support arm
（5）For carbon fiber pipe.
6. noncontact according to claim 1 whole audience strain measurement method under water, it is characterised in that：Design and dissipate in step 1
Spot figure uses MATLAB or Adobe Photoshop CS.
7. noncontact according to claim 1 whole audience strain measurement method under water, it is characterised in that：The digital speckle is soft
Part uses GOM Correlate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710498131.0A CN107131842A (en) | 2017-06-27 | 2017-06-27 | A kind of noncontact whole audience strain measurement method under water |
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| CN201710498131.0A CN107131842A (en) | 2017-06-27 | 2017-06-27 | A kind of noncontact whole audience strain measurement method under water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323663A (en) * | 2018-10-31 | 2019-02-12 | 中国科学院西安光学精密机械研究所 | A kind of underwater binocular Intersection Measuring System based on high speed camera |
| CN109682575A (en) * | 2019-01-25 | 2019-04-26 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | The underwater dynamic deformation binocular measuring system of composite propeller model rotating vane |
| WO2020206865A1 (en) * | 2019-04-11 | 2020-10-15 | 中国矿业大学(北京) | Underwater explosion pressure test experiment system and method |
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| CN101182994A (en) * | 2007-12-10 | 2008-05-21 | 哈尔滨工业大学 | Non-contact type measurement indirect tensile strain method |
| CN101655352A (en) * | 2009-09-15 | 2010-02-24 | 西安交通大学 | Three-dimensional speckle strain measurement device and measurement method thereof |
| CN201885689U (en) * | 2010-11-30 | 2011-06-29 | 中国船舶重工集团公司第七一一研究所 | High speed non-contact sensor for impact displacement linear array |
| CN103162637A (en) * | 2013-03-25 | 2013-06-19 | 徐从裕 | Non-contact plane strain measuring method |
| CN103292722A (en) * | 2013-06-07 | 2013-09-11 | 温州大学 | Three-dimensional deformation measuring method of non-contact wind power blade whole field |
| CN103994727A (en) * | 2014-05-23 | 2014-08-20 | 中国科学院武汉岩土力学研究所 | Speckle manufacturing method based on transfer print technology |
| CN104567822A (en) * | 2015-01-12 | 2015-04-29 | 浙江省计量科学研究院 | Device for implementing three-dimensional vision distance measurement and characteristic extraction of underwater structure light |
| CN105571510A (en) * | 2016-03-10 | 2016-05-11 | 国家海洋标准计量中心 | Underwater pressure-resistant micro-deformation measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101182994A (en) * | 2007-12-10 | 2008-05-21 | 哈尔滨工业大学 | Non-contact type measurement indirect tensile strain method |
| CN101655352A (en) * | 2009-09-15 | 2010-02-24 | 西安交通大学 | Three-dimensional speckle strain measurement device and measurement method thereof |
| CN201885689U (en) * | 2010-11-30 | 2011-06-29 | 中国船舶重工集团公司第七一一研究所 | High speed non-contact sensor for impact displacement linear array |
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| CN103292722A (en) * | 2013-06-07 | 2013-09-11 | 温州大学 | Three-dimensional deformation measuring method of non-contact wind power blade whole field |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323663A (en) * | 2018-10-31 | 2019-02-12 | 中国科学院西安光学精密机械研究所 | A kind of underwater binocular Intersection Measuring System based on high speed camera |
| CN109323663B (en) * | 2018-10-31 | 2024-04-05 | 中国科学院西安光学精密机械研究所 | Underwater binocular intersection measurement system based on high-speed camera |
| CN109682575A (en) * | 2019-01-25 | 2019-04-26 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | The underwater dynamic deformation binocular measuring system of composite propeller model rotating vane |
| CN109682575B (en) * | 2019-01-25 | 2020-06-16 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Underwater dynamic deformation binocular measurement system for rotating blades of composite propeller model |
| WO2020206865A1 (en) * | 2019-04-11 | 2020-10-15 | 中国矿业大学(北京) | Underwater explosion pressure test experiment system and method |
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