CN105043525A - Laser speckle-based vibration information detection method - Google Patents
Laser speckle-based vibration information detection method Download PDFInfo
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- CN105043525A CN105043525A CN201510220597.5A CN201510220597A CN105043525A CN 105043525 A CN105043525 A CN 105043525A CN 201510220597 A CN201510220597 A CN 201510220597A CN 105043525 A CN105043525 A CN 105043525A
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Abstract
The invention relates to a laser speckle-based vibration information detection method. In the prior art, the lossless remote measurement of the vibration information cannot be realized. The method is designed based on the laser environmental perception principle and integrates the laser speckle defocused imaging technique, wherein laser speckles in a to-be-detected region are imaged by means of a defocused optical imaging system. A fiber optics bundle is arranged in the image space of the defocused optical imaging system. One end of the fiber optics bundle is positioned in the laser speckle defocused imaging region of the defocused optical imaging system. Each optical fiber at the other end of the fiber optics bundle is connected with one photoelectric sensor to realize the photoelectric conversion. Each photoelectric sensor is connected with a signal processing part, so that signals can be quickly processed. A vibration analysis unit comprehensively analyzes each signal of the photoelectric sensor to obtain the vibration information of the to-be-detected region. The laser speckle-based vibration information detection method has the advantages of non-contact detection, non-damage detection, remote measurement, high sensitivity, high reliability, strong anti-interference capability, wide frequency response range, large information amount, easy construction, convenient usage, wide application range, and the like.
Description
Technical field
The invention belongs to optical technical field, relate to a kind of vibration information extracting method, particularly based on a vibration information extracting method for laser speckle behavior, the vibration information be mainly used in the necks such as voice collecting, vibration monitoring, quality testing, noise analysis, environmental monitoring, resource exploration, biological study, life science, medical, process control, national defense safety, engineering test, assessment of risks, environment sensing, Internet of Things, process control, advanced manufacture extracts.
Background technology
Vibration refer to object all or part of linearly or curve come and go out vibration, there is regular hour rule or cycle, sense stricto vibration detection is the lower status monitoring by vibrating in working order machine or structure, can carry out fault diagnosis, environmental Kuznets Curves, ranking to machine or structure; The forced vibration of monitoring or structure obtains the dynamic property (comprising: the information such as natural frequency, damping, response, mode) of measurand, find out weak link, its vibration resistance is improved by Curve guide impeller, or working environment and the performance of machinery is improved by vibration isolation process, broadly vibration detection also comprises the research engineering content in acoustics and audio area.Vibration is extensively present in the necks such as voice collecting, vibration monitoring, quality testing, noise analysis, environmental monitoring, resource exploration, biological study, life science, medical, process control, national defense safety, engineering test, assessment of risks, environment sensing, Internet of Things, process control, advanced manufacture, and more and more urgent to the demand of vibration detection, testing requirement is also more and more higher.Vibration information detection method is there is in first technology, a kind of piezoelectric vibration sensors, (see United States Patent (USP), patent name: Piezoelectricvibrationsensor, inventor: OrtenBirger, the patent No.: US7656524B2, the license time: on 05 06th, 2008), although there is certain feature, but it is not enough still to there is essence, 1) piezoelectric principle is adopted to carry out vibration detection, vibration transducer is made into based on piezoelectric, then vibration transducer and detected material carry out contacting perception vibration information, therefore cannot realize in essence vibrating remote measurement at a distance, 2) because piezoelectric vibration sensors and detected material exist closely mutually used, detected material and residing environment can affect piezoelectric vibration sensing process, affect correctness and the sensitivity of testing result, and then affect the reliability of vibration detection process, 3) there is self intrinsic mechanical frequency characteristic due to piezoelectric and based on the vibration transducer that piezoelectric is made into, natural frequency characteristic limits the frequency response behavior that vibration information detects, both affect vibration detection quantity of information, again limit frequency detecting range of application, 4) first vibration detecting system build complicated, use not convenient, function to be not easy to expand.
Summary of the invention
The object of the invention is to the deficiency for above-mentioned technology, a kind of vibration information detection method based on laser speckle behavior is provided, there is Poul Dorset Sheep, Non-Destructive Testing, remote measurement can be realized, high sensitivity, reliability is high, antijamming capability is strong, frequency response characteristic is wide, quantity of information is high, system is easy to build, easy-to-use, applied range, function are easy to the features such as expansion.
Basic conception of the present invention is: based on laser environment perception principle, utilize laser speckle out of focus imaging technique, laser beam irradiation is to detected region, laser speckle carries out imaging through out of focus optical imaging system, the image space of out of focus optical imaging system is provided with fibre bundle, fibre bundle one end is positioned at out of focus optical imaging system speckle out of focus imaging region, to spread out of with speckle defocused image, every root optical fiber of the fibre bundle other end is connected with a photoelectric sensor and realizes opto-electronic conversion, each photoelectric sensor connection signal processing element carries out signal fast processing, vibration analysis unit analyzes each photo-sensor signal will by comprehensive, obtain the vibration information of surveyed area.
A kind of vibration information detection method based on laser speckle behavior of the present invention, its concrete technical scheme is as follows:
The light path of step (1) LASER Light Source outgoing beam is provided with light beam adjustment component, and light beam adjustment component regulates light beam parameters or propagation characteristic, reaches measurement laser beam and the direction of propagation;
Step (2) laser beam irradiation is to detected region, and detected region exists optical interface, and laser beam is scattered at optical interface place, and laser light scattering effect occurs, and forms laser light scattering light field, presents Laser Transmission speckle;
Step (3) scattered optical field is through out of focus optical imaging system, the image space of out of focus optical imaging system is provided with fibre bundle, fibre bundle one end is positioned at out of focus optical imaging system speckle out of focus imaging region, to spread out of by speckle defocused image information, every root optical fiber of the fibre bundle other end is connected with a photoelectric sensor and realizes opto-electronic conversion;
Step (4) photoelectric sensor connection signal processing element carries out signal fast processing, and vibration analysis unit analyzes each photo-sensor signal will by comprehensive, obtains the vibration information of surveyed area.
Described LASER Light Source is the middle one of laser diode, diode laser, gas laser, solid-state laser, dye laser, semiconductor laser.
Described light beam adjustment component is the middle one of lens type light beam adjustment component, reflected light beams adjustment component, liquid crystal beam adjustment component, micro-nano structure light beam adjustment component.
Described out of focus optical imaging system is the middle one of refractive optical imaging system, reflective optic imaging system, hybrid optical imaging system.
Described photoelectric sensor is the middle one of photodiode, phototriode, snowslide pipe, photomultiplier.
Described vibration analysis unit is the middle one of computing machine, embedded system, digital signal processor, mobile terminal device.
In the present invention, speckle principle, image processing techniques, fibre bundle preparation and use, multi-information merging technology are mature technology.Inventive point of the present invention is based on laser environment perception principle, utilize laser speckle out of focus imaging technique, provide a kind of Poul Dorset Sheep, Non-Destructive Testing, remote measurement can be realized, high sensitivity, reliability is high, antijamming capability is strong, frequency response characteristic is wide, quantity of information is high, system is easy to build, easy-to-use, applied range, function are easy to the vibration information detection method based on laser speckle behavior that expands.
Compared with prior art, advantage of the present invention:
1) adopt piezoelectric principle to carry out vibration detection in first technology, be made into vibration transducer based on piezoelectric, then vibration transducer and detected material carry out contacting perception vibration information, therefore cannot realize in essence vibrating remote measurement at a distance.The present invention is based on laser environment perception principle, utilize laser speckle out of focus imaging technique, laser beam irradiation is to detected region, laser speckle carries out imaging through out of focus optical imaging system, carrying out light field by fibre bundle to spread out of, and then detected by photodetector, obtaining vibration information by analyzing, the present invention has given full play to speckle principle and imaging telecommute characteristic, therefore has Poul Dorset Sheep, Non-Destructive Testing, can realize the feature such as remote measurement, high sensitivity;
2) due in first technology piezoelectric vibration sensors and detected material exist closely mutually used, detected material and residing environment can affect piezoelectric vibration sensing process, affect correctness and the sensitivity of testing result, and then affect the reliability of vibration detection process.The present invention is essentially laser speckle remote measurement principle, avoid in essence and contact with the direct of detected material, and optical detection principle is affected by the external environment little, thus have that reliability is high, antijamming capability is strong, detected material form and material is various, quantity of information high;
3) there is self intrinsic mechanical frequency characteristic due to piezoelectric and based on the vibration transducer that piezoelectric is made into, natural frequency characteristic limits the frequency response behavior that vibration information detects, both affect vibration detection quantity of information, again limit frequency detecting range of application.In the present invention, the image space of out of focus optical imaging system is provided with fibre bundle, fibre bundle one end is positioned at out of focus optical imaging system speckle out of focus imaging region, to spread out of with speckle defocused image, every root optical fiber of the fibre bundle other end is connected with a photoelectric sensor and realizes opto-electronic conversion, each photoelectric sensor connection signal processing element carries out signal fast processing, therefore, frequency characteristic of the present invention is not limited to device engineering properties, and Photoelectric Signal Processing speed is fast, frequency range is wide, therefore, it is wide that the present invention has frequency response characteristic, further increase quantity of information,
4) first vibration detecting system build complicated, use not convenient, function to be not easy to expand.The present invention adopts speckle photoelectricity remote measurement principle and optical fiber technology, and simple for structure, the vibration information detection method based on laser speckle behavior of the present invention is had and is easy to build, use special facility, applied range, function to be easy to the features such as expansion.
Accompanying drawing explanation
Fig. 1 is a kind of example structure schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, a kind of embodiment of the vibration information detection method based on laser speckle behavior, utilize laser speckle out of focus imaging technique, laser beam irradiation is to detected region, laser speckle carries out imaging through out of focus optical imaging system, the image space of out of focus optical imaging system is provided with fibre bundle, fibre bundle one end is positioned at out of focus optical imaging system speckle out of focus imaging region, to spread out of with speckle defocused image, every root optical fiber of the fibre bundle other end is connected with a photoelectric sensor and realizes opto-electronic conversion, each photoelectric sensor connection signal processing element carries out signal fast processing, vibration analysis unit analyzes each photo-sensor signal will by comprehensive, obtain the vibration information of surveyed area.
The specific implementation step of the present embodiment is:
The light path of step (1) LASER Light Source 1 outgoing beam is provided with light beam adjustment component 2, and light beam adjustment component 2 regulates light beam parameters or propagation characteristic, reaches measurement laser beam and the direction of propagation; In the present embodiment, LASER Light Source 1 is the solid state laser of 532 nano wave lengths, light beam adjustment component 2 adopts lens light beam orthopaedic component, and the light path of LASER Light Source 1 outgoing beam is provided with bundle reflection part, and beam reflection parts are for changing the direction of propagation of LASER Light Source 1 outgoing beam;
Step (2) laser beam irradiation is to detected region, and detected region exists optical interface 3, and laser beam is scattered at optical interface 3 place, and laser light scattering effect occurs, and forms laser light scattering light field, presents Laser Transmission speckle; In the present embodiment, optical interface 3 is cell phone rear cover in the room door-plate of 50 meters of distant places and the communication process of 20 meters of distances;
Step (3) scattered optical field is through out of focus optical imaging system 4, the image space of out of focus optical imaging system 4 is provided with fibre bundle 5, fibre bundle 5 one end 501 is positioned at out of focus optical imaging system speckle out of focus imaging region, to spread out of by speckle defocused image information, every root optical fiber of fibre bundle 5 other end is connected with a photoelectric sensor and realizes opto-electronic conversion, and fibre bundle 5 other end is photosensor arrays 502; In the present embodiment, photosensor arrays 502 adopts complementary metal oxide semiconductor (CMOS) electric transducer array, and out of focus optical imaging system 4 is refractive optical imaging, and fibre bundle 5 adopts multimode fiber-optic bundle;
The photoelectric sensor connection signal processing element that the every root fiber end face place of step (4) is arranged carries out signal fast processing, Signal Processing Element is integrated into vibration analysis unit 6, vibration analysis unit 6 analyzes each photo-sensor signal will by comprehensive, obtains the vibration information of surveyed area; In the present embodiment, vibration analysis unit 6 adopts embedded system.
The present embodiment successfully achieves the harmless remote measurement of the mechanical vibration of the room door-plate of 50 meters of distant places, also achieves cell phone rear cover vibration characteristics in the communication process of 20 meters of distances simultaneously and detects.The present invention has Poul Dorset Sheep, Non-Destructive Testing, can realize remote measurement, high sensitivity, reliability is high, antijamming capability is strong, frequency response characteristic is wide, quantity of information is high, system is easy to build, easy-to-use, applied range, function are easy to the features such as expansion.
Above-described embodiment has been described in detail technical scheme of the present invention and beneficial effect; be understood that and the foregoing is only most preferred embodiment of the present invention; be not limited to the present invention; all make in spirit of the present invention any amendment, supplement and equivalent to replace, all should be included within protection scope of the present invention.
Claims (6)
1., based on a vibration information detection method for laser speckle behavior, it is characterized in that comprising the following steps:
The light path of step (1) LASER Light Source outgoing beam is provided with light beam adjustment component, and light beam adjustment component regulates light beam parameters or propagation characteristic, reaches measurement laser beam and the direction of propagation;
Step (2) laser beam irradiation is to detected region, and detected region exists optical interface, and laser beam is scattered at optical interface place, and laser light scattering effect occurs, and forms laser light scattering light field, presents Laser Transmission speckle;
Step (3) scattered optical field is through out of focus optical imaging system, the image space of out of focus optical imaging system is provided with fibre bundle, fibre bundle one end is positioned at out of focus optical imaging system speckle out of focus imaging region, to spread out of by speckle defocused image information, every root optical fiber of the fibre bundle other end is connected with a photoelectric sensor and realizes opto-electronic conversion;
Step (4) photoelectric sensor connection signal processing element carries out signal fast processing, and vibration analysis unit analyzes each photo-sensor signal will by comprehensive, obtains the vibration information of surveyed area.
2. a kind of vibration information detection method based on laser speckle behavior as claimed in claim 1, is characterized in that: described LASER Light Source is the one in laser diode, diode laser, gas laser, solid-state laser, dye laser, semiconductor laser.
3. a kind of vibration information detection method based on laser speckle behavior as claimed in claim 1, is characterized in that: described light beam adjustment component is the one in lens type light beam adjustment component, reflected light beams adjustment component, liquid crystal beam adjustment component, micro-nano structure light beam adjustment component.
4. a kind of vibration information detection method based on laser speckle behavior as claimed in claim 1, is characterized in that: described out of focus optical imaging system is the one in refractive optical imaging system, reflective optic imaging system, hybrid optical imaging system.
5. a kind of vibration information detection method based on laser speckle behavior as claimed in claim 1, is characterized in that: described photoelectric sensor is the one in photodiode, phototriode, snowslide pipe, photomultiplier.
6. a kind of vibration information detection method based on laser speckle behavior as claimed in claim 1, is characterized in that: described vibration analysis unit is the one in computing machine, embedded system, digital signal processor, mobile terminal device.
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Cited By (7)
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| CN105258783A (en) * | 2015-11-16 | 2016-01-20 | 杭州电子科技大学 | Vibration detection method based on laser wavefront coding technique |
| CN106768880A (en) * | 2016-12-01 | 2017-05-31 | 上海航天控制技术研究所 | A kind of liquid lens liquid/liquid interface vibrates stability test system and method |
| CN111095180A (en) * | 2017-05-19 | 2020-05-01 | 斯特凡Tto有限公司 | Touch-based input device |
| CN112880803A (en) * | 2021-01-19 | 2021-06-01 | 业成科技（成都）有限公司 | Optical environment oscillation detection system and optical measurement method using same |
| CN113026090A (en) * | 2021-02-08 | 2021-06-25 | 杭州富加镓业科技有限公司 | Detection method of seed crystal rod jitter detection device and crystal growth method |
| CN113063755A (en) * | 2015-11-17 | 2021-07-02 | 韩国科学技术院 | Sample characteristic detection device using chaotic wave sensor |
| CN114459592A (en) * | 2022-01-21 | 2022-05-10 | 厦门大学 | Laser speckle micro-vibration measurement system and method based on roller shutter CMOS |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258783A (en) * | 2015-11-16 | 2016-01-20 | 杭州电子科技大学 | Vibration detection method based on laser wavefront coding technique |
| CN105258783B (en) * | 2015-11-16 | 2019-01-18 | 杭州电子科技大学 | A kind of method for detecting vibration based on laser wavefront coding technology |
| CN113063755A (en) * | 2015-11-17 | 2021-07-02 | 韩国科学技术院 | Sample characteristic detection device using chaotic wave sensor |
| CN106768880A (en) * | 2016-12-01 | 2017-05-31 | 上海航天控制技术研究所 | A kind of liquid lens liquid/liquid interface vibrates stability test system and method |
| CN106768880B (en) * | 2016-12-01 | 2019-11-12 | 上海航天控制技术研究所 | A kind of liquid lens liquid/liquid interface vibration stability test system and method |
| CN111095180A (en) * | 2017-05-19 | 2020-05-01 | 斯特凡Tto有限公司 | Touch-based input device |
| CN111095180B (en) * | 2017-05-19 | 2023-12-15 | 斯特凡Tto有限公司 | Touch-based input device |
| CN112880803A (en) * | 2021-01-19 | 2021-06-01 | 业成科技（成都）有限公司 | Optical environment oscillation detection system and optical measurement method using same |
| CN112880803B (en) * | 2021-01-19 | 2022-11-22 | 业成科技（成都）有限公司 | Optical environment oscillation detection system and optical measurement method using same |
| CN113026090A (en) * | 2021-02-08 | 2021-06-25 | 杭州富加镓业科技有限公司 | Detection method of seed crystal rod jitter detection device and crystal growth method |
| CN114459592A (en) * | 2022-01-21 | 2022-05-10 | 厦门大学 | Laser speckle micro-vibration measurement system and method based on roller shutter CMOS |
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