CN101799453B - Novel double-waving mixing interference ultrasonic vibration detection device - Google Patents
Novel double-waving mixing interference ultrasonic vibration detection device Download PDFInfo
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- CN101799453B CN101799453B CN2010101358665A CN201010135866A CN101799453B CN 101799453 B CN101799453 B CN 101799453B CN 2010101358665 A CN2010101358665 A CN 2010101358665A CN 201010135866 A CN201010135866 A CN 201010135866A CN 101799453 B CN101799453 B CN 101799453B
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Abstract
The invention discloses a novel double-waving mixing interference ultrasonic vibration detection device and a method. The device comprises a continuous laser source (1), laser is divided into two paths through a 50/50 beam splitter (2), the first path of the laser passes through a 1/2 waveplate (3) and passes through a polarization coupling lens (4) in a total transmission way, the transmitted light beam passes through a 1/4 waveplate (5) and is gathered to the surface of a test block (7) through a convex lens (6), the light beam carrying out the ultrasonic vibration of the test block (7) is reflected by the surface of the test block (7) and passes through the convex lens (6) and the 1/4 waveplate (5), the light is fully reflected, passes through the polarization coupling lens (4), and is emitted into a lithium niobate crystal (9) through a 1/2 waveplate (8), the second path of laser is reflected by a reflecting lens (10), and is reflected into the lithium niobate crystal (9) through a reflecting lens (11), the first path of signal light carrying out the ultrasonic vibration and the second path of reference light form the interference in the lithium niobate crystal (9), and the light after the interference is gathered into a photoelectric receiver (13) by a gathering lens (12). Through the device, the light intensity received by the photoelectric receiver (13) can be converted into electric signals, and ultrasonic signals can be demodulated through signal processing, and the characteristics of materials can be evaluated according to a signal chart of the ultrasonic vibration.
Description
Technical field
The present invention relates to a kind of device and method of laser double-waving mixing interference, especially a kind of laser-ultrasound detection system that can detect ultrasonic vibration in the medium.
Background technology
At present, the laser-ultrasound detection technique is in the widespread use of Non-Destructive Testing field, and common laser-ultrasound detection system has laser heterodyne interferometry pick-up unit and confocal Fabry Perot interference device (being called for short CFPI) etc., the part but these devices all come with some shortcomings.Very sensitive when at first the difference interference system detects to the vibration of surrounding environment, and inevitable disturbance meeting influence the accuracy of result of detection and the difficulty of the light path of this device debugging comparison when this device is applied to industry spot and detects.Though CFPI is to the speed sensitive of solid surface, the vibration of surrounding environment there is very strong inhibition ability, CFPI requires that stable working point is arranged, and the system design difficulty of system is big and cost is very high.Industrial detection requires to have high sensitivity and system cost low, and the present invention designs with regard to being based on this needs.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of use, than conventional apparatus and the method precision is higher, cost is lower device and method.
The inventive system comprises a continuous laser source (1); Laser is divided into two-way through 50/50 beam splitter (2), and behind 1/2nd wave plates (3), total transmissivity is through polarization coupled mirror (4) as detecting light beam for first via laser; The light beam that sees through is through quarter-wave plate (5); Pass through convex lens (6) again and converge to test block (7) surface, the light that has carried the surperficial ultrasonic vibration of test block (7) passes through convergent lens (6) and quarter-wave plate (5) once more through test block (7) surface reflection; The light total reflection that reflects is through polarization coupled mirror (4), and this light is injected in the lithium columbate crystal (9) through 1/2nd wave plates (8); The second road laser light beam as a reference passes through catoptron (11) reflection again and gets in the lithium columbate crystal (9) through catoptron (10) reflection; The flashlight and the second road reference light that the first via has been carried ultrasonic vibration form interference in lithium columbate crystal (9); Light after the interference converges in the photelectric receiver (13) through convex lens (12); The light intensity that photodetector receives is converted into electric signal, can demodulate the ultrasonic signal in the test block (7) through signal Processing.
The beneficial effect of this new device and method is to adopt lithium columbate crystal, revises the noise that ability good restraining ambient environment vibrations produces in real time to interfering preceding flashlight and reference light to carry out wavefront; Successfully used the linearly polarized light of laser instrument in addition; Can effectively prevent to feedback the interference of light to light source stability, in addition, through the use of polarization coupled mirror; Can also eliminate the influence of parasitic light to interfering; In addition, this device has also made full use of all light intensity, and remolding sensitivity conventional interference instrument apparatus is high.
Description of drawings
Accompanying drawing 1 has provided schematic diagram of device of the present invention.
Accompanying drawing 2 has provided the double-waving mixing interference schematic diagram of device of the present invention.
Accompanying drawing 3 has provided the embodiment that device of the present invention detects ultrasonic vibration.
Embodiment
Embodiment 1:
Shown in accompanying drawing 1, this laser-ultrasound pick-up unit comprises: continuous laser source (1), 50/50 beam splitter (2), 1/2nd wave plates (3); Polarization coupled mirror (4), quarter-wave plate (5), convex lens (6), test material (7); / 2nd wave plates (8), lithium columbate crystal (9), catoptron (10); Level crossing (11), convex lens (12), photelectric receiver (13).
It is the continuous laser of 532nm that lasing light emitter (1) produces wavelength, and laser is divided into two-way through 50/50 beam splitter (2), first via laser as detecting light beam behind 1/2nd wave plates (3); Total transmissivity is through polarization coupled mirror (4); The light beam that sees through passes through convex lens (6) again and converges to test block (7) surface through quarter-wave plate (5), and the light that has carried the surperficial ultrasonic vibration of test block (7) is through test block (7) surface reflection; Pass through convergent lens (6) and quarter-wave plate (5) once more; Twice laser polarization direction through quarter-wave plate (5) changed 90 °, and this light total reflection is through polarization coupled mirror (4), and this light is injected in the lithium columbate crystal (9) through 1/2nd wave plates (8); The second road laser light beam as a reference passes through catoptron (11) reflection again and gets in the lithium columbate crystal (9) through catoptron (10) reflection; The flashlight and the second road reference light that the first via has been carried ultrasonic vibration form interference in lithium columbate crystal (9), the light after the interference converges in the photelectric receiver (13) through convex lens (12).
Embodiment 2:
Shown in accompanying drawing 2, this double-waving mixing interference device comprises: lithium columbate crystal (9), convex lens (12), photelectric receiver (13), reference light (14), flashlight (15).
Reference light (14) and flashlight (15) are injected in the lithium columbate crystal (9), interfere the back to form the dynamic holographic grating, and the light beam that comes out is injected photelectric receiver (13) through convex lens (12), and light signal is transformed into electric signal.
Embodiment 3:
Shown in accompanying drawing 3, this laser-ultrasound pick-up unit comprises: continuous laser source (1), 50/50 beam splitter (2), 1/2nd wave plates (3); Polarization coupled mirror (4), quarter-wave plate (5), convex lens (6), test material (7); / 2nd wave plates (8), lithium columbate crystal (9), catoptron (10); Level crossing (11), convex lens (12), photelectric receiver (13).
It is the continuous laser of 532nm that lasing light emitter (1) produces wavelength, and the polarization direction of this light beam is vertical, and laser is divided into the two-way light beam through 50/50 beam splitter (2); First via laser as detecting light beam through 1/2nd wave plates (3) afterwards; The change of polarized direction of laser 90 ° of polarized lights that become horizontal direction, the light beam full impregnated is through polarization coupled mirror (4), the light beam that sees through is through quarter-wave plate (5); Planoconvex lens (6) converges to test block material (7) surface; The light that has carried the surperficial ultrasonic vibration of test block (7) through test block (7) surface reflection through convex lens (6) and quarter-wave plate (5), pass through for twice quarter-wave plate (5) the laser beam change of polarized direction 90 °, become the laser of vertical direction polarization; This light beam is all-trans through polarization coupled mirror (4); Through 1/2nd wave plates (8), this light polarization direction becomes vertical direction, injects in the lithium columbate crystal (9); The second road laser light beam as a reference reflects through catoptron (10); Get in the lithium columbate crystal (9) through catoptron (11) reflection again; Reference light gets into lithium columbate crystal (9) before; Utilize level crossing (10) and level crossing (11), the angle of reference light and flashlight is adjusted between 20～30 °, and through the equivalent optical path of the flashlight told of 50/50 beam splitter (2) with reference light arrival lithium columbate crystal (9) process.The first via has been carried the flashlight of ultrasonic vibration and the laser that is all the vertical direction polarization of the second road reference light, and two light waves mix the formation interference in lithium columbate crystal (9), and the light after the interference converges in the photelectric receiver (13) through convex lens (12).
Light through photelectric receiver (13) is received carries out processing and amplifying; And utilize simple signal Processing can the ultrasonic vibration demodulation of carrying in this signal be come out; This ultrasonic signal figure has just carried the parameter of relevant material behavior and defective, can make evaluation to the material character of test block according to this.
Claims (1)
1. the device of a double-waving mixing interference ultrasonic vibration detection comprises: continuous laser source (1), 50/50 beam splitter (2), the 1/1st wave plate (3); Polarization coupled mirror (4), quarter-wave plate (5), first convex lens (6), test material (7); The 1/2nd wave plate (8), lithium columbate crystal (9), first level crossing (10), second level crossing (11); Second convex lens (12), photelectric receiver (13) is characterized in that:
What continuous laser source (1) produced is that wavelength is the continuous laser of 532nm, and laser is divided into two-way through 50/50 beam splitter (2), first via laser as detecting light beam behind the 1/1st wave plate (3); Total transmissivity is through polarization coupled mirror (4); The light beam that sees through converges to the surface of test material (7) again through quarter-wave plate (5) through first convex lens (6), the laser that has carried the surperficial ultrasonic vibration of test material (7) becomes flashlight; This flashlight is through test material (7) surface reflection; Through first convex lens (6) and quarter-wave plate (5), be all-trans again through polarization coupled mirror (4), inject in the lithium columbate crystal (9) through the 1/2nd wave plate (8) again; The second road laser is light beam as a reference, through first level crossing (10) reflection, gets in the lithium columbate crystal (9) through second level crossing (11) reflection again; Said flashlight and said reference light be two light wave mixed interferences in lithium columbate crystal (9); Light after the interference converges in the photelectric receiver (13) through second convex lens (12); Said reference light gets into lithium columbate crystal (9) before; Utilize first level crossing (10) and second level crossing (11), the angle of said reference light and said flashlight adjusted between 20～30 °, through the flashlight told of 50/50 beam splitter (2) and reference light arrival lithium columbate crystal (9) the equivalent optical path of process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101358665A CN101799453B (en) | 2010-03-30 | 2010-03-30 | Novel double-waving mixing interference ultrasonic vibration detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101358665A CN101799453B (en) | 2010-03-30 | 2010-03-30 | Novel double-waving mixing interference ultrasonic vibration detection device |
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| CN101799453A CN101799453A (en) | 2010-08-11 |
| CN101799453B true CN101799453B (en) | 2012-03-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105301097B (en) * | 2015-06-25 | 2018-09-11 | 浙江大学 | A kind of excitation of laser-ultrasound and detecting system and its detection method |
| CN105414763B (en) * | 2016-01-15 | 2017-03-29 | 长春理工大学 | A kind of ultrasonic coaxial auxiliary laser welding method of plate type heat exchanger |
| CN109444265B (en) * | 2018-12-19 | 2024-04-02 | 莆田学院 | Laser ultrasonic vibration detection device and method |
| EP3715911A1 (en) * | 2019-03-27 | 2020-09-30 | Baumer Electric AG | Sensor arrangement |
| CN110108349B (en) * | 2019-05-23 | 2022-04-22 | 中国科学院光电研究院 | Laser vibration meter |
| CN111060191B (en) * | 2019-12-27 | 2021-09-03 | 中国科学院长春光学精密机械与物理研究所 | Reflection type feedback phase-locked laser vibration measuring device and measuring method thereof |
| CN111521566B (en) * | 2020-06-09 | 2022-11-15 | 中国计量科学研究院 | Laser ultrasonic nondestructive testing system based on double-wave mixing |
| CN114018825B (en) * | 2021-09-26 | 2022-12-02 | 宝宇(武汉)激光技术有限公司 | High-precision photorefractive crystal interference nondestructive flaw detection equipment and method |
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| US3978713A (en) * | 1975-05-27 | 1976-09-07 | General Electric Company | Laser generation of ultrasonic waves for nondestructive testing |
| CN101281172A (en) * | 2007-04-04 | 2008-10-08 | 南京理工大学 | Laser sonic surface wave stress test system |
| CN101285702A (en) * | 2007-12-21 | 2008-10-15 | 西北工业大学 | Ultrasound suspending field visualized measurement method and its measuring systems |
| CN201149521Y (en) * | 2007-12-21 | 2008-11-12 | 西北工业大学 | Apparatus with upside-down mounting telescope for measuring ultrasonic suspending field |
| CN201145612Y (en) * | 2007-12-21 | 2008-11-05 | 西北工业大学 | Ultrasonic suspending field measurement apparatus |
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