CN1039157C - Intelligent interference cloud testing instrument - Google Patents
Intelligent interference cloud testing instrument Download PDFInfo
- Publication number
- CN1039157C CN1039157C CN94118741A CN94118741A CN1039157C CN 1039157 C CN1039157 C CN 1039157C CN 94118741 A CN94118741 A CN 94118741A CN 94118741 A CN94118741 A CN 94118741A CN 1039157 C CN1039157 C CN 1039157C
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- China
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- microcomputer
- instrument
- video camera
- moire
- reflector group
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Abstract
The present invention belongs to an instrument for testing and monitoring engineering material and member strength, which comprises a laser 1, an extender lens 2, a collimating lens 3, a main spectroscope 4, a secondary spectroscope 5, reflector sets 6 and 7, a video camera 9, a monitor 10, a circuit board 11, a stepping motor 12, a video recorder 13, a microcomputer 14 and a mechanism 16 for moving and lifting 9. Except for 13 and 14, all the other components are combined in a closed frame 15.6 and 7 are driven by the microcomputer to produce the motion of rotating and pitching so as to realize the small stepping of grating frequency, large-range regulation and regulation of initial moire and carrier wave moire to suit tests with different distances. Besides, a stepping circuit board, an image treatment card and matched software are arranged in the microcomputer so as to implement the functions of control, treatment and judgment.
Description
The invention belongs to test of actual construction material and component strength and monitoring instrument.
Existing moir measuring technology, when using He-Ne Lasers, grid are 200～3000 lines per millimeters frequently.Can be used for the contactless whole audience displacement of construction material and member, the test of strain, but since as follows, laboratory applications be limited to basically.1. it is to arrange temporarily, be adjusted to required light path with optics in bulk, component of machine when working, and adjusts repeatedly with manual method to reach required grid frequently.Footprint area is big, and is time-consuming, requires special knowledge and technical ability.2. must carry out in the darkroom.3. must carry out being provided with on the worktable of anti-shock system.4. after obtaining to reflect the moire topographies of test result, must after washing the reproduction of phase or computer screen, pass through gray scale scanning method extraction Displacements Distribution data by taking pictures or camera acquisition with artificial or computing machine.The former wastes time and energy, and the latter is bigger at the more time error of noise.Therefore for a long time, the on-the-spot test of construction material and member can only be used Electrical Measuring Instrument.Highly sensitive moir is difficult to use at engineering site.And electric measuring method is a bayonet point, requires correctly to layout by the regularity of distribution of stress field.And the regularity of distribution of stress field often is to long for the result who obtains by test, and this contradiction might cause the omission of dangerous point, the conclusion that leads to errors.American I BM company released portable engineering moire interferometer (Portable Engineering moireinterferometer is PEMI) in 94 years and has been claimed as exclusive product.Its measurement sensitivity has only 2400 lines per millimeters (being the 417nm/ striped) a kind of, and non-adjustable.Therefore can only use 1200 lines per millimeter specimen gratings, measuring distance is less than 150 millimeters.This instrument is combined by main part (grating forms system) and receiving system, display system, light-source system four parts.Reconfigure during use and adjust, original state also needs manual shift, requires the technical skill personnel to use.
In view of the foregoing, the purpose of this invention is to provide a kind of light, mechanical, electrical integrated Microcomputerized interference cloud testing instrument that can be convenient to rig-site utilization.This interferometer has been introduced photoelectron and computer technology, applicable to different measurement sensitivities and different measuring distances, and processing and arbitration functions is arranged.It can be worked under the situation of lucifuge not, does not need special-purpose vibration isolators, and its test benchmark grating frequency is 500 lines per millimeters～3000 lines per millimeters, can reach 1 100 millimeters to the tested object distance.
Structure of the present invention and principle of work are as shown in drawings.Microcomputerized interference cloud testing instrument has laser instrument (1), beam expanding lens (2), collimating mirror (3), main spectroscope (4), secondary spectroscope (5), reflector group (6), (7), video camera (9), monitor (10), circuit board (11), stepper motor (12), and video recorder (13), microcomputer (14) etc.Except that video recorder (13), microcomputer (14), be equipped with in the multistory frame structure (15) of lifting, walking and rotational structure (being dot-and-dash line part in the accompanying drawing) bottom that is assembled in a sealing with above-mentioned parts.It can stop entering of parasitic light.The laser beam that laser instrument (1) sends becomes collimated light through beam expanding lens (2) and collimating mirror (3).Be divided into transmission and reflected light two bundles through main spectroscope (4) again, each bundle respectively is divided into two bundles through a pair of secondary spectroscope (5) again.Be shaped on the tested object (8) of quadrature grid in advance by two groups of collimated light beam directives of reflector group (6), (7) outgoing, form contour of equal displacement---two groups of moire patterns of reflection level and the displacement of vertical bidimensional.Two groups of moire topographies by two-dimensional grating ± 1 rank diffracted beam interference forms and received by camera system, promptly enters framework (15).The interference image of this diffracted beam is through screen or directly taken in by video camera (9), gets rid of the moire topographies of ambient lighting influence, shows in real time or microcomputer (14) is handled at monitor (10), or stand-by by its overall process under video recorder (13) record.Respectively be provided with rotation and luffing mechanism that two stepper motors (12) drive in reflector group (6), (7), the realization grid are regulated apart from a large scale by the small step of microcomputer (14) control frequently, and the adjusting of initial moire or carrier wave moire.Be its still the scalable original state perhaps apply carrier fringe near null field, and realize adjusting, to adapt to the different requirements at engineering test scene to the tested object distance.Multistory frame (15) can be divided into three layers, and this hierarchy is the needs of function, also is in order to reduce volume.It is on the middle level that rotating reflector group (6) is arranged on same plane, and its center and tested object center are with high.Be arranged on upper and lower layer and form horizontal direction grating reflection mirror group (7), it is centered close in the vertical plane of symmetry of instrument, and each catoptron center is identical to the centre distance of tested object (8).And 4 catoptron centers are symmetrically distributed with the vertical plane of symmetry of instrument in same transversal section.Because two light beams that form the vignette grid are by same laser instrument (1) and beam expanding lens (2), collimating mirror directive tested objects such as (3), its vibration source is basic identical.Therefore environment or body vibration are more insensitive to the influence of moire pattern.Video camera of the present invention requires can take p.s. the above image of 20～50 frames, and require that freezing speed is equally fast arranged, and make≤moire pattern under 50 times/second ambient vibrations, still can clear imaging, thereby realized the on-the-spot test under the low-frequency vibration environment, and do not needed special-purpose vibration isolators.Lifting and left/right movement device (16) are housed in the bottom of video camera (9).Because this system is installed in the framework (body) of sealing, irreflexive ambient lighting major part is blocked and can not enters, and just can enter imaging system at the focus place that laser beam focuses on through aperture, has further limited injecting of residual stray light bundle.Successfully realized to break away from the darkroom fully in the on-the-spot test of normal illumination (illumination allows to reach 150 luxs, promptly more than the 200W lamp lighting) environment.The motion of video camera travel mechanism (16) and the aperture of video camera, focal length, shooting distance are controlled by the respective keys on microcomputer (14) or the instrument panel (or telepilot).It can be gathered the moire topographies panorama, and the local amplifying camera of diverse location has further guaranteed the sharpness and the measuring accuracy of bar graph.In order to realize above-mentioned functions, industrial siding an outpost of the tax office and the image processing card and the matching used software package of step-by-step system is housed in the microcomputer (14).Common accurate thread or worm gear mode have been adopted in the transmission of step-by-step system, driver circuit plate (11) is to be contained in the closed frame (15), the industrial siding an outpost of the tax office that step-by-step system is housed in microcomputer is attached thereto, and dedicated line is stuck in microcomputer (14) is connected specified interface when sending different instruction surface-mounted integrated circuit.The image processing card is the image card more than 512 * 512 * 8.Matching used software package can freeze and memory image at hard disk, at any time keep edge filter by microcomputer (14), taper filtering, black, informal voucher line rim detection, the striped binaryzation (promptly becomes and has only two kinds of gray scales, the image of black and white contrast distinctness), refinement (is promptly extracted the center line of striped, with width only is that lines that resemble bundle are described) etc. pre-service, from the image of being gathered, extract displacement, strain, physical quantity such as stress or stress intensity factor, determine its regularity of distribution, and the result compared with the critical value of setting, when arriving critical value, give the alarm or carry out the predetermined measures order.
The present invention utilizes laser beam rectilinear propagation characteristic, receives way by beeline channel and little aperture are set, and with whole ray machine parts combined closings together, realizes the test under the normal illumination.Realize that the visual field reaches the whole audience test of the twodimensional displacement field of the φ 100 mm dia areas of a circle.Owing on reflector group, installed by microcomputer or by the step-by-step system of key control, automatic, semi-automatic adjustings such as benchmark grating and carrier fringe have been realized, it is per step 15 that step pitch reaches 0.0042 ° of per step "; per step changes the grid frequency less than 3 lines per millimeters, only is 0.6% (during 500 lines per millimeters)～0.1% (during 3000 lines per millimeters) of grid line frequency.Whole light, mechanical, electrical systems comprise monitor (10), and whole instrument main part volume is 0.5 * 0.6 * 0.8M
3, be about 1/6 of common similar test unit.Also be with road wheel, 360 ° of rotations of level, pitching ± 30 ° rotation, hydraulic lifting is regulated and locking device, is convenient to Field adjustment and use.
This instrument not only can be applied in teaching, the research work such as whole audience stress-strain analysis in teaching, R﹠D institution, and can be widely used in actual construction material, engineering component, comprise anisotropic solid biologic material, compound substance etc. complicated or brand-new material, in the strength test of industry spot, or be applied in the monitoring of dangerous position; Can also in the Non-Destructive Testing of the supervisory system of the petroleum pipe line of high temperature, high pressure, some compound substance and nondestructive evaluation, use; If adopt pulsed laser and high speed video camera, can also be applied to dynamically and shock-testing, vibration-testing.
Claims (4)
1. Microcomputerized interference cloud testing instrument, has laser instrument (1), beam expanding lens (2), collimating mirror (3), main spectroscope (4), secondary spectroscope (5), reflector group (6), (7), video camera (9), monitor (10), driver circuit plate (11), stepper motor (12) and video recorder (13), microcomputer (14) etc., it is characterized in that above-mentioned parts are removed video recorder (13), outside the microcomputer (14), lifting is equipped with in the bottom that is assembled in a sealing, in the multistory frame structure (15) of walking and rotating mechanism, by reflector group (6), (7) two of outgoing groups of collimated light beam directives are shaped on the tested object (8) of quadrature grid in advance, its ± 1 rank diffracted beam enters framework (15), the interference image of this diffracted beam is through screen or directly taken in by video camera (9), the moire topographies of getting rid of the ambient lighting influence, show in real time or be video recorder (13) typing at monitor (10), in reflector group (6), (7) respectively be provided with rotation and luffing mechanism that two stepper motors (12) drive in, realize that grid are regulated apart from a large scale by the small step of microcomputer (14) control frequently and the adjusting of initial moire and carrier wave moire.
2. according to the described Microcomputerized interference cloud testing instrument of claim 1, it is characterized in that described multistory frame (15) can be divided into three layers, rotating reflector group (6) is arranged on same plane (middle level), its center and tested object center are with high, rotating reflector group (7) is arranged on upper and lower layer, it is centered close in the vertical plane of symmetry of instrument, each catoptron center to the centre distance of tested object (8) is identical, and 4 catoptron centers are symmetrically distributed with the vertical plane of symmetry of instrument in same transversal section.
3. according to the described Microcomputerized interference cloud testing instrument of right claim 1, it is characterized in that described video camera (9) can take the above image of 20～50 frames p.s., lifting and left/right movement device (16) are housed in the bottom of video camera (9), and the aperture of this motion of mechanism and video camera, focal length, shooting distance are controlled by the respective keys on microcomputer (14) or the instrument panel (or telepilot).
4. according to the described Microcomputerized interference cloud testing instrument of claim 1, it is characterized in that being equipped with in the described microcomputer (1 4) the industrial siding an outpost of the tax office of step-by-step system, with image processing card and matching used software package, except that carrying out control, work as displacement, can give the alarm or carry out the predetermined measures order when physical quantitys such as strain reach critical value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94118741A CN1039157C (en) | 1994-12-01 | 1994-12-01 | Intelligent interference cloud testing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94118741A CN1039157C (en) | 1994-12-01 | 1994-12-01 | Intelligent interference cloud testing instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1114746A CN1114746A (en) | 1996-01-10 |
| CN1039157C true CN1039157C (en) | 1998-07-15 |
Family
ID=5038975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94118741A Expired - Fee Related CN1039157C (en) | 1994-12-01 | 1994-12-01 | Intelligent interference cloud testing instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1039157C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316225C (en) * | 2005-07-21 | 2007-05-16 | 上海交通大学 | Inner three-directional moire interferometer |
| CN103033297B (en) * | 2012-12-10 | 2014-10-22 | 中国船舶重工集团公司第七一一研究所 | Analysis meter for residual stress distribution along depth |
| CN111413220A (en) * | 2020-05-06 | 2020-07-14 | 郝文峰 | In-situ measuring device for dynamic fracture stress intensity factor of material in damp and hot environment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3943278A (en) * | 1974-08-22 | 1976-03-09 | Stanford Research Institute | Surface deformation gauging system by moire interferometry |
| US4850693A (en) * | 1988-05-23 | 1989-07-25 | The United States Of America As Represented By The United States Department Of Energy | Compact portable diffraction moire interferometer |
| US5243542A (en) * | 1987-12-29 | 1993-09-07 | Asahi Kogaku Kogyo Kabushiki Kaisha | Interferometer employing reference images |
| US5307152A (en) * | 1992-09-29 | 1994-04-26 | Industrial Technology Institute | Moire inspection system |
| US5349442A (en) * | 1991-09-20 | 1994-09-20 | Eg&G Idaho, Inc. | Hand held phase-shifting diffraction moire interferometer |
-
1994
- 1994-12-01 CN CN94118741A patent/CN1039157C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3943278A (en) * | 1974-08-22 | 1976-03-09 | Stanford Research Institute | Surface deformation gauging system by moire interferometry |
| US5243542A (en) * | 1987-12-29 | 1993-09-07 | Asahi Kogaku Kogyo Kabushiki Kaisha | Interferometer employing reference images |
| US4850693A (en) * | 1988-05-23 | 1989-07-25 | The United States Of America As Represented By The United States Department Of Energy | Compact portable diffraction moire interferometer |
| US5349442A (en) * | 1991-09-20 | 1994-09-20 | Eg&G Idaho, Inc. | Hand held phase-shifting diffraction moire interferometer |
| US5307152A (en) * | 1992-09-29 | 1994-04-26 | Industrial Technology Institute | Moire inspection system |
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| Publication number | Publication date |
|---|---|
| CN1114746A (en) | 1996-01-10 |
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