CN1283976C - Dual wavelength two-dimensional space phase shifting electronic speckle interferometer - Google Patents
Dual wavelength two-dimensional space phase shifting electronic speckle interferometer Download PDFInfo
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- CN1283976C CN1283976C CN 200510025029 CN200510025029A CN1283976C CN 1283976 C CN1283976 C CN 1283976C CN 200510025029 CN200510025029 CN 200510025029 CN 200510025029 A CN200510025029 A CN 200510025029A CN 1283976 C CN1283976 C CN 1283976C
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Abstract
The present invention relates to a dual-wavelength two-dimensional space phase shift electronic speckle interferometer which mainly comprises two groups of laser radiation mechanisms, an interference receiving mechanism, four groups of laser reflection mechanisms and a space phase shift mechanism, wherein the two groups of laser radiation mechanisms comprise a pumping red-laser radiation mechanism and a pumping green-laser radiation mechanism. The present invention simultaneously adopts the 644.6 nm pumping red-laser device and the 532 nm pumping green-laser device as light sources to respectively and correspondingly obtain a U field and a V field, and an interference filter with different wavelengths passing through is adopted to independently separate the U field and the V field from three-dimensional deformation. A space phase shift device (deflecting carrier wave plate) is used for digitizing strips, and pure interference strips of the U field and the V field can be simultaneously obtained; the present invention realizes strip digitization because of the addition of a space phase shift function.
Description
Technical field
The present invention relates to a kind of photoelectron instrument, particularly a kind of dual wavelength two-dimensional space phase shifting electronic speckle interferometer.
Background technology
(Electronic Speckle Pattern Interferometry ESPI), is a kind of complex art that Computer Image Processing, laser and interference combine to electronic speckle pattern interferometry.
Electronic speckle interferometer is used in the optical measurement mechanics field, research and teaching is of many uses in testing, and non-cpntact measurement can obtain the striped of tested object plane internal field displacement field (U, V field), for finite element provides reliable boundary condition.Can be used for structure optimization, can be applied in mesomechanics, residual stress measurement, compound substance research.Especially in structure analysis and non-destructive detection, be widely used.Aftertreatment by necessity obtains the needed information of deviser (digitizing).And do not need as the research of traditional photodynamics, to be equipped with dark place, show the photographic fixing wet process, the complicated light path etc. of building, saved extensive work.
The present domestic similar electronic speckle interferometer that still do not have, the external electronic speckle interferometer of producing mainly contains following two kinds.
A kind of is the three-dimensional electronic speckle interferometer that Steibichler company produces, and its index path as shown in Figure 1.Number in the figure, 111 is laser instrument A, and 112 is laser instrument B, and 113 is laser instrument C, and 114 is video camera, and 115 is reference substance, and 116 is measured object.As seen from Figure 1, this instrument adopts the three beams of laser irradiation, and the angle that laser A and B are positioned at xoy plane and z axle is respectively α, β.A, B irradiation can solve U, W field displacement.The angle that another laser beam C is positioned at xoz plane and z axle is γ, and the result reflects the equation of V and W, obtains the displacement of U, V and W field by simultaneous equations, and U field and V field do not obtain simultaneously.This method by program solution must be brought bigger error.
Another kind is the three-dimensional electronic speckle interferometer that Ettemeyer company produces, and its index path as shown in Figure 2.Number in the figure, 121 is camera, and 122 is completely reflecting mirror, and 123 is laser instrument, and 124 is measured object.As seen from Figure 2, this instrument can directly independently obtain U field and V field, and still, U field and V field neither obtain simultaneously.
The light source that the three-dimensional electronic speckle interferometer of above-mentioned two companies uses all is a LASER Light Source, all can not directly obtain the independently interference fringe of U, V, must try to achieve U field and V field indirectly by de-connecting cube journey.Certainly will bring bigger error like this, its practicality and construction value are greatly reduced.
Summary of the invention
Purpose of the present invention, be to solve the problems referred to above that the prior art electronic speckle interferometer exists, provide a kind of and can obtain the interference fringe of pure U, V field directly, simultaneously, and can realize the digitized dual wavelength two-dimensional space phase shifting electronic speckle interferometer of striped.
The technical solution used in the present invention is: a kind of dual wavelength two-dimensional space phase shifting electronic speckle interferometer, comprise apparatus frame and the optical instrument that is installed on the framework, described apparatus frame comprises four extension arms that main body frame and orthogonal thereto fork distribute and be connected with main body frame, two chambeies about main body frame is separated into by a vertical clapboard; Described optical instrument comprises two groups of laser radiation mechanisms, interference receiving mechanism, four groups of laser-bounce mechanisms and spatial phase shift mechanism; Two groups of laser radiation mechanisms are separately positioned on the left chamber of main body frame, interference receiving mechanism is arranged on the right chamber of main body frame, four groups of laser-bounce mechanisms are installed in four respectively extends on the arms, and spatial phase shift mechanism is installed in the outside of main body frame and adaptive adjacent with interference receiving mechanism;
Described two groups of laser radiation mechanisms are red laser radiation mechanism of pumping and the green laser radiation mechanism of pumping;
Described four groups of laser-bounce mechanisms comprise that be arranged on the relative both sides of apparatus subject framework two extend two groups of red laser-bounce mechanisms on the arms and be arranged on the apparatus subject framework that two other extends the green laser-bounce of on arm two groups mechanism.
The red laser radiation mechanism of described pumping comprises the red laser instrument of pumping, be arranged on the Amici prism on the red laser light path of pumping and be arranged on a light path break-in catoptron on the Amici prism reflected light path; The green laser radiation mechanism of described pumping comprises pumping green laser, be arranged on Amici prism on the pumping green laser light path, be arranged on a light path break-in catoptron on the Amici prism transmitted light path and be arranged on two light path break-in catoptrons on the Amici prism reflected light path.
Each is made up of the green laser-bounce of described two groups of red laser-bounce mechanisms and two groups mechanism a beam expanding lens and a completely reflecting mirror.
Described interference receiving mechanism comprises square glass prism, be arranged on ruddiness optical filter and the ruddiness receiving mechanism on the square glass prism transmitted light path and be arranged on green glow optical filter and green glow receiving mechanism on the square glass prism reflected light path.
Described spatial phase shift mechanism comprises the support that is fixed on the main body frame, rack-mount stepper motor, wave carrier piece and framework thereof, and stepper motor links to each other with the transmission of wave carrier piece framework.
Described each beam expanding lens is the sphere beam expanding lens excessively of minor diameter high index of refraction.
Described ruddiness receiving mechanism and green glow receiving mechanism are by image-forming objective lens and the CCD charge coupled device composition that is threaded.
Described main body frame has four supporting seats, is connected with the magnetic force gauge stand under each supporting seat respectively.
Dual wavelength two-dimensional space phase shifting electronic speckle interferometer of the present invention makes it compared with prior art owing to adopted above technical scheme, and following advantage and characteristics are arranged:
1, utilizes the different hands-off principles of optical maser wavelength, adopt two different laser instruments (dual wavelength) as light source simultaneously, be red laser instrument of 644.6nm pumping and 532nm pumping green laser, correspondence obtains U field and V field respectively, have that volume is little, power is big, in light weight, single mode output, long, the portable advantage of coherent length, be applicable to on-the-spot the use, and can be contained on the vibrationproof platform and work;
2,, but make U field and V field independent separate in the 3 D deformation come out owing to the interference filter that has adopted different wave length to pass through;
3, have noncontact, high sensitivity, without dark place and apparent photographic fixing wet process, even can be directly used in the scene, be convenient to aftertreatment;
4, can realize the digitizing of striped by spatial phase shift device (deflection wave carrier piece), not only can obtain deforming stripe, know region of stress concentration, more can understand the size of deflection fully, promptly not only striped intuitively can be obtained, and required numerical quantities can be obtained;
5, since adopted minor diameter, high index of refraction cross the sphere beam expanding lens, can make the laser diffusion area bigger, the survey area at the 1m place is Φ 300mm.
6, can obtain the interference fringe of pure U field and V field directly, simultaneously, add the spatial phase shift function, realize the digitizing of striped; Used software can be realized computer-automatic collection, calculating and post processing of image;
7, can solve the static state in the engineering, dynamically accurate and dynamic problem, have a extensive future;
8, can be used for teaching, the effect in electron interference has deep understanding to computing machine to make the student of photo-measuring experimental mechanics and physical optics specialty, and can be used as the strong instrument that master and doctoral candidate are engaged in correlative study;
9, the boundary condition that calculates for FEM (finite element) obtains to provide a kind of effective ways.
Description of drawings
Fig. 1 is the index path of the three-dimensional electronic speckle interferometer of Steibichler company production;
Fig. 2 is the index path of the three-dimensional electronic speckle interferometer of Ettemeyer company production;
Fig. 3 is the Facad structure synoptic diagram of dual wavelength two-dimensional space phase shifting electronic speckle interferometer of the present invention;
Fig. 4 is the side structure synoptic diagram of dual wavelength two-dimensional space phase shifting electronic speckle interferometer of the present invention;
Fig. 5 is the red laser radiation light path of pumping of the present invention (U field) figure;
Fig. 6 is the green laser radiation light path of pumping of the present invention (V field) figure;
Fig. 7 is that red laser of pumping of the present invention and the green laser of pumping (U, V field) are measured index path.
Embodiment
Referring to Fig. 3, Fig. 4, cooperate referring to Fig. 5, Fig. 6, Fig. 7.Dual wavelength two-dimensional space phase shifting electronic speckle interferometer of the present invention comprises apparatus frame 1 and is installed in two groups of laser radiation mechanisms 2 (cooperating referring to Fig. 5) on the framework, 3 (cooperating referring to Fig. 6), interference receiving mechanism 4, four groups of laser- bounce mechanisms 5,6,7,8 and spatial phase shift mechanisms 9.
Apparatus frame 1 comprises four extension arms 12 that main body frame 11 and orthogonal thereto fork distribute and be connected with main body frame, main body frame 1 has four supporting seats 13, be connected with magnetic force gauge stand 14 under each supporting seat respectively, two chambeies about main body frame 1 is separated into by a vertical clapboard 15.
Cooperation is referring to Fig. 5, Fig. 6.Two groups of laser radiation mechanisms 2,3 are red laser radiation mechanism 2 of pumping and the green laser radiation mechanism 3 of pumping, and it is separately positioned on the left chamber of main body frame, and each optical element all is installed on the vertical clapboard, and the assurance center at grade.The red laser radiation mechanism 2 of pumping comprises the red laser instrument 21 of pumping, be arranged on the Amici prism 22 on the red laser light path of pumping and be arranged on a light path break-in catoptron 23 on the Amici prism reflected light path, from the red laser-bounce of the transmitted light directive mechanism 5 that Amici prism 22 comes out, through the red laser-bounce of the reflected light directive mechanism 6 that catoptron 23 reflects.The green laser radiation mechanism 3 of pumping comprises pumping green laser 31, be arranged on Amici prism 32 on the pumping green laser light path, be arranged on a light path break-in catoptron 33 on the Amici prism transmitted light path and be arranged on two light path break-in catoptrons 34,35 on the Amici prism reflected light path, through the green laser-bounce of the reflected light directive mechanism 7 that catoptron 33 reflects, through the green laser-bounce of the reflected light directive mechanism 8 that catoptron 35 reflects.
Referring to Fig. 4, cooperate referring to Fig. 7.Interference receiving mechanism 4 is arranged on the right chamber of main body frame 11, comprises square glass prism 41, is arranged on 644.6nm ruddiness optical filter 42 on the square glass prism transmitted light path and ruddiness receiving mechanism 43 (receiving the U field) and is arranged on 532nm green glow optical filter 44 and green glow receiving mechanism 45 (receiving the V field) on the square glass prism reflected light path.Ruddiness receiving mechanism 43 is threaded by image-forming objective lens 431 and CCD charge coupled device 432 and forms.Green glow receiving mechanism 45 is threaded by image-forming objective lens 451 and CCD charge coupled device 452 and forms.
Referring to Fig. 3, cooperate referring to Fig. 5, Fig. 6.Four groups of laser- bounce mechanisms 5,6,7,8 are installed in four respectively extends on the arm 12, represents twin-beam u field and twin-beam v field respectively.Comprise the green laser-bounce of two groups of red laser-bounce mechanism 5,6 (U fields) and two groups mechanism 7,8 (V fields).Two groups of red laser-bounce mechanisms 5,6 are separately positioned on two of the relative both sides of apparatus subject framework extends on the arms, and red laser-bounce mechanism 5 comprises beam expanding lens 51 and completely reflecting mirror 52, and red laser-bounce mechanism 6 comprises beam expanding lens 61 and completely reflecting mirror 62.Two groups of green laser- bounce mechanisms 7,8 be separately positioned on the apparatus subject framework in addition relatively two of both sides extend on the arms, green laser-bounce mechanism 7 comprises beam expanding lens 71 and completely reflecting mirror 72, green laser-bounce mechanism 8 comprises beam expanding lens 81 and completely reflecting mirror 82.Beam expanding lens in each reflecting mechanism is the sphere beam expanding lens excessively of minor diameter high index of refraction, is installed in respectively on each laser radiation light path, and the reflected light of each completely reflecting mirror is directive measured object direction all.
Cooperation is referring to Fig. 4, and spatial phase shift mechanism 9 is installed in the outside of main body frame 11 and adaptive adjacent with interference receiving mechanism 4, has receive window on the main body frame 11 between spatial phase shift mechanism 9 and the interference receiving mechanism 4.Spatial phase shift mechanism 9 comprises the support 91 that is fixed on the main body frame 11, rack-mount stepper motor 92, wave carrier piece and framework 93 thereof, and stepper motor 92 links to each other with the transmission of wave carrier piece framework.
Instrument receiving light path and principle are described as follows in conjunction with Fig. 7: red laser instrument of 644.6nm pumping (corresponding U field) and 532nm pumping green laser (corresponding V field) are respectively told the surface that two-beam is radiated at measured object 10 simultaneously, reflex to spatial phase shift mechanism by measured object, by the square glass prism 41 in wave carrier piece 93 and the interference receiving mechanism 4, pass the transmitted light of square glass prism 41 and reflected light under the effect of different wave length optical filter (644.6nm optical filter and 532nm optical filter), select the light of different wave length to pass through, realize the striped collection of while u and v field, striped is a rectilinearity striped in the face, thereby stable being easy to of striped regulated.Wave carrier piece 93 can rotate under the effect of stepper motor 92 and produce uniform spatial carrier, realizes the digitizing of striped, not only can obtain deforming stripe, know region of stress concentration, more can understand the size of deflection fully, promptly not only can obtain striped intuitively, and can obtain numerical quantities.
Claims (8)
1, a kind of dual wavelength two-dimensional space phase shifting electronic speckle interferometer, comprise apparatus frame and the optical instrument that is installed on the framework, described apparatus frame comprises four extension arms that main body frame and orthogonal thereto fork distribute and be connected with main body frame, two chambeies about main body frame is separated into by a vertical clapboard; Described optical instrument comprises two groups of laser radiation mechanisms, interference receiving mechanism, four groups of laser-bounce mechanisms; Two groups of laser radiation mechanisms are separately positioned on the left chamber of main body frame, and interference receiving mechanism is arranged on the right chamber of main body frame, and four groups of laser-bounce mechanisms are installed in four respectively extends on the arm, it is characterized in that:
Also comprise spatial phase shift mechanism, be installed in the outside of main body frame and adaptive adjacent with interference receiving mechanism;
Described two groups of laser radiation mechanisms are red laser radiation mechanism of pumping and the green laser radiation mechanism of pumping;
Described four groups of laser-bounce mechanisms comprise that be arranged on the relative both sides of apparatus subject framework two extend two groups of red laser-bounce mechanisms on the arms and be arranged on the apparatus subject framework that two other extends the green laser-bounce of on arm two groups mechanism.
2, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 1 is characterized in that: the red laser radiation mechanism of described pumping comprises the red laser instrument of pumping, be arranged on the Amici prism on the red laser light path of pumping and be arranged on a light path break-in catoptron on the Amici prism reflected light path; The green laser radiation mechanism of described pumping comprises pumping green laser, be arranged on Amici prism on the pumping green laser light path, be arranged on a light path break-in catoptron on the Amici prism transmitted light path and be arranged on two light path break-in catoptrons on the Amici prism reflected light path.
3, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 1 is characterized in that: each is made up of the green laser-bounce of described two groups of red laser-bounce mechanisms and two groups mechanism a beam expanding lens and a completely reflecting mirror.
4, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 1 is characterized in that: described interference receiving mechanism comprises square glass prism, be arranged on ruddiness optical filter and the ruddiness receiving mechanism on the square glass prism transmitted light path and be arranged on green glow optical filter and green glow receiving mechanism on the square glass prism reflected light path.
5, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 1, it is characterized in that: described spatial phase shift mechanism comprises the support that is fixed on the main body frame, rack-mount stepper motor, wave carrier piece and framework thereof, and stepper motor links to each other with the transmission of wave carrier piece framework.
6, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 3 is characterized in that: described each beam expanding lens is the sphere beam expanding lens excessively of minor diameter high index of refraction.
7, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 4 is characterized in that: described ruddiness receiving mechanism and green glow receiving mechanism are by image-forming objective lens and the CCD charge coupled device composition that is threaded.
8, dual wavelength two-dimensional space phase shifting electronic speckle interferometer as claimed in claim 1 is characterized in that: described main body frame has four supporting seats, is connected with the magnetic force gauge stand under each supporting seat respectively.
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| CN 200510025029 CN1283976C (en) | 2005-04-13 | 2005-04-13 | Dual wavelength two-dimensional space phase shifting electronic speckle interferometer |
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| CN 200510025029 CN1283976C (en) | 2005-04-13 | 2005-04-13 | Dual wavelength two-dimensional space phase shifting electronic speckle interferometer |
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| CN1670468A CN1670468A (en) | 2005-09-21 |
| CN1283976C true CN1283976C (en) | 2006-11-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2712929C1 (en) * | 2019-05-21 | 2020-02-03 | федеральное государственное автономное образовательное учреждение высшего образования "Российский государственный университет нефти и газа (национальный исследовательский университет) имени И.М. Губкина" | Method of determining internal residual stresses and device for its implementation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2712929C1 (en) * | 2019-05-21 | 2020-02-03 | федеральное государственное автономное образовательное учреждение высшего образования "Российский государственный университет нефти и газа (национальный исследовательский университет) имени И.М. Губкина" | Method of determining internal residual stresses and device for its implementation |
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