CN104776907A - Vibration detection method based on multi-point laser speckle extreme value tracking - Google Patents
Vibration detection method based on multi-point laser speckle extreme value tracking Download PDFInfo
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Abstract
The invention relates to a vibration detection method based on multi-point laser speckle extreme value tracking. An existing method cannot achieve vibration information lossless remote sensing. On the basis of the multi-point laser speckle principle and the extreme value tracking technology, laser beams of multiple light intensity peaks are irradiated to a detected area, the multi-point laser scattering effect is generated on the detected area, multi-point laser speckle is imaged through a out-of-focus optical imaging system, an optical microchannel plate is arranged in the image space of the out-of-focus optical imaging system, a speckle out-of-focus image is transmitted out, signal amplification, denoising and information difference and comparison are performed on the basis of a circuit to obtain an optical information extreme position evolution track, and an analysis module obtains the vibration frequency characteristic and amplitude information. The vibration detection method has the advantages of being capable of achieving non-contact detection and lossless detection, capable of achieving remote sensing, high in sensitivity, reliability and interference resistance, wide in frequency response characteristic range and high in information amount, facilitating system construction, being convenient to use and wide in application range, facilitating function expansion and integration and the like.
Description
Technical field
The invention belongs to optical technical field, relate to a kind of method for detecting vibration, particularly based on the method for detecting vibration based on multiple spot laser speckle extreme value following, be mainly used in the vibration monitoring in the necks such as vibration monitoring, noise analysis, voice collecting, engineering test, assessment of risks, environment sensing, quality testing, environmental monitoring, resource exploration, biological life, medical, process control, national defense safety, Internet of Things, process control, advanced manufacture.
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, broadly vibrate the research engineering content also comprised in acoustics and audio area.Vibration detection is extensively present in the necks such as vibration monitoring, noise analysis, voice collecting, engineering test, assessment of risks, environment sensing, quality testing, environmental monitoring, resource exploration, biological life, medical, process control, national defense safety, Internet of Things, process control, advanced manufacture, and also more and more higher to the requirement of vibration detection.Vibration information detection method is there is in first technology, a kind of piezoelectric vibration sensors, (see United States Patent (USP), patent name: Piezoelectric vibration sensor, inventor: Orten Birger, 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, method for detecting vibration based on multiple spot laser speckle extreme value following 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 be easy to build, easy-to-use, application extensively send out, function be easy to expand, be convenient to the features such as integrated.
Basic conception of the present invention is: based on multiple spot laser speckle principle and extreme value following technology, many light intensity peak laser beam irradiation is to detected region, there is multiple spot laser light scattering effect in detected region, multiple spot 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 optics microchannel plate, to spread out of with speckle defocused image, each optical channel is connected with an optical waveguide, the other end of optical waveguide is connected with photoelectric sensor and realizes the opto-electronic conversion of each optical channel, signal amplification is carried out based on circuit, denoising, information difference and comparing, obtain optical information extreme value place evolutional path, analysis module obtains vibration frequency characteristic and amplitude information, returned by information and drill output module and carry out vibration information output.
A kind of method for detecting vibration based on multiple spot laser speckle extreme value following of the present invention, its concrete technical scheme is as follows:
Step (1) many light intensity peak LASER Light Source outgoing beam is the laser beam of many light intensity peak, the light path of the laser beam of many light intensity peak is provided with light beam adjustment component, 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, by multiple spot laser light scattering effect, forms laser light scattering transmission light field and outwards propagates;
The multiple spot laser speckle that step (3) laser light scattering transmission light field is outwards propagated carries out imaging through out of focus optical imaging system, the image space of out of focus optical imaging system is provided with optics microchannel plate, to spread out of with speckle defocused image, each optical channel of optics microchannel plate is connected with an optical waveguide, and the other end of optical waveguide is connected with photoelectric sensor and realizes the opto-electronic conversion of each optical channel;
The opto-electronic conversion information that step (4) opto-electronic conversion obtains amplified by signal and de-noise module to the amplification of the signal of each optical channel optoelectronic information and denoising, then utilize circuit differential comparison module carry out all optical channel optoelectronic informations difference, compare and position record;
Step (5) circuit differential comparison module export all optical channel optoelectronic informations difference, compare with position record result by optical information extreme value place evolutional path module, analysis obtains optical information extreme value place time-domain information, analysis module obtains vibration frequency characteristic and amplitude information, is returned drill output module and carry out vibration information output by information.
Described LASER Light Source is regulate the one in the laser instrument of the laser instrument of higher order laser light field outgoing, the outgoing of the extrinsic pattern of outer cavity modulation many light intensity peak light field in resonator cavity.
The laser instrument of the described extrinsic pattern of outer cavity modulation many light intensity peak light field outgoing is bonded by laser adjustment module outside the one in laser diode, diode laser, gas laser, solid-state laser, dye laser or semiconductor laser and chamber.
Described light beam adjustment component is the one in lens type light beam adjustment component, reflected light beams adjustment component, acousto-optic modulator, electrooptic modulator, liquid crystal beam adjustment component, micro-nano structure light beam adjustment component.
Described out of focus optical imaging system is the one in 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.
In the present invention, speckle principle, image processing techniques, optics microchannel plate, multi-information merging technology are mature technology.Inventive point of the present invention is based on multiple spot laser speckle principle and extreme value following technology, 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 be easy to build, easy-to-use, application extensively send out, function be easy to expand, be convenient to the integrated method for detecting vibration based on multiple spot laser speckle extreme value following.
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 multiple spot laser speckle principle and extreme value following technology, many light intensity peak laser beam irradiation is to detected region, there is multiple spot laser light scattering effect in detected region, multiple spot 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 optics microchannel plate, to spread out of with speckle defocused image, and then detected by photodetector, vibration information is obtained by analyzing, the present invention has given full play to multiple spot laser speckle principle and imaging telecommute characteristic, therefore there is Poul Dorset Sheep, Non-Destructive Testing, remote measurement can be realized, the features such as 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, meanwhile, carry out signal amplification, denoising, information difference based on circuit and compare 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 analysis of optical information extreme value place evolutional path is carried out based on circuit, analysis module obtains vibration frequency characteristic and amplitude information, returned by information and drill output module and carry out vibration information output, frequency characteristic of the present invention is not limited to device engineering properties, and Photoelectric Signal Processing speed is fast, frequency range wide, further increases quantity of information;
4) first vibration detecting system build complicated, use not convenient, function to be not easy to expand.The present invention adopts multiple spot speckle photoelectricity remote measurement principle and optical waveguide technique, and signal analysis processes based on hardware circuit, make the vibration information detection method based on laser speckle behavior of the present invention have simple for structure, build flexibly, use special facility, applied range, function to be easy to expansion, to be convenient to the features such as integrated.
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 method for detecting vibration based on multiple spot laser speckle extreme value following, based on multiple spot laser speckle principle and extreme value following technology, many light intensity peak laser beam irradiation is to detected region, there is multiple spot laser light scattering effect in detected region, multiple spot 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 optics microchannel plate, to spread out of with speckle defocused image, signal amplification is carried out based on circuit, denoising, information difference and comparing, obtain optical information extreme value place evolutional path, analysis module analyzes vibration frequency characteristic and amplitude information, returned by information and drill output module and carry out vibration information output.
The specific implementation step of the present embodiment is:
Step (1) many light intensity peak LASER Light Source 1 outgoing beam is the laser beam of many light intensity peak, the light path of the laser beam of many light intensity peak is provided with light beam adjustment component 2, 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 laser instrument regulating the outgoing of higher order laser light field in resonator cavity, and output wavelength is the helium-neon gas laser of 632.8 nano wave lengths, and output beam is senior Ince light beam, and light beam adjustment component 2 adopts lens light beam orthopaedic component;
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, multiple spot laser light scattering effect, forms laser light scattering transmission light field and outwards propagates; In the present embodiment, there is the paper that optical interface 3 is 8 meters of distant places in detected region;
Step (3) is provided with optics microchannel plate 5 in the image space of out of focus optical imaging system 4, to spread out of with speckle defocused image, each optical channel is connected with an optical waveguide, optics microchannel plate 5 is connected with optical waveguide bundle 6, the other end of each optical waveguide of optical waveguide bundle 6 is connected with photoelectric sensor and realizes the opto-electronic conversion of each optical channel, and the photoelectric sensor that the other end of optical waveguide bundle 6 is all constitutes photosensor arrays 7; In the present embodiment, out of focus optical imaging system 4 is refractive optical imaging, and optics microchannel plate 5 adopts Glass optical microchannel plate, and optical waveguide bundle 6 adopts fibre bundle, and photosensor arrays 7 adopts photodiode array;
Step (4) opto-electronic conversion information is amplified and de-noise module 8 by signal, based on circuit hardware system carry out each optical channel optoelectronic information signal amplify and denoising, then utilize circuit differential comparison module 9 carry out all optical channel optoelectronic informations difference, compare and position record;
The difference of all optical channel optoelectronic informations that step (5) optical information extreme value place evolutional path module 10 is exported by analysis circuit differential comparison module 9, to compare and position record result, analysis obtains optical information extreme value place time-domain information, analysis module 11 obtains vibration frequency characteristic and amplitude information, is returned drill output module 12 and carry out vibration information output by information.
The present embodiment successfully achieves the paper vibration information remote measurement of 8 meters of distant places.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, be widely used, function is easy to expand, be convenient to the features such as integrated.
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 method for detecting vibration for multiple spot laser speckle extreme value following, it is characterized in that comprising the following steps:
Step (1) many light intensity peak LASER Light Source outgoing beam is the laser beam of many light intensity peak, the light path of the laser beam of many light intensity peak is provided with light beam adjustment component, 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, by multiple spot laser light scattering effect, forms laser light scattering transmission light field and outwards propagates;
The multiple spot laser speckle that step (3) laser light scattering transmission light field is outwards propagated carries out imaging through out of focus optical imaging system, the image space of out of focus optical imaging system is provided with optics microchannel plate, to spread out of with speckle defocused image, each optical channel of optics microchannel plate is connected with an optical waveguide, and the other end of optical waveguide is connected with photoelectric sensor and realizes the opto-electronic conversion of each optical channel;
The opto-electronic conversion information that step (4) opto-electronic conversion obtains amplified by signal and de-noise module to the amplification of the signal of each optical channel optoelectronic information and denoising, then utilize circuit differential comparison module carry out all optical channel optoelectronic informations difference, compare and position record;
Step (5) circuit differential comparison module export all optical channel optoelectronic informations difference, compare with position record result by optical information extreme value place evolutional path module, analysis obtains optical information extreme value place time-domain information, analysis module obtains vibration frequency characteristic and amplitude information, is returned drill output module and carry out vibration information output by information.
2. a kind of method for detecting vibration based on multiple spot laser speckle extreme value following as claimed in claim 1, is characterized in that: described LASER Light Source is regulate the laser instrument of higher order laser light field outgoing or the laser instrument of the extrinsic pattern of outer cavity modulation many light intensity peak light field outgoing in resonator cavity.
3. the laser instrument of the extrinsic pattern of outer cavity modulation many light intensity peak light field outgoing as claimed in claim 2, is characterized in that: the laser instrument of the described extrinsic pattern of outer cavity modulation many light intensity peak light field outgoing is bonded by laser adjustment module outside the one in laser diode, diode laser, gas laser, solid-state laser, dye laser or semiconductor laser and chamber.
4. a kind of method for detecting vibration based on multiple spot laser speckle extreme value following 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, acousto-optic modulator, electrooptic modulator, liquid crystal beam adjustment component, micro-nano structure light beam adjustment component.
5. a kind of method for detecting vibration based on multiple spot laser speckle extreme value following 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.
6. a kind of method for detecting vibration based on multiple spot laser speckle extreme value following as claimed in claim 1, is characterized in that: described photoelectric sensor is the one in photodiode, phototriode, snowslide pipe, photomultiplier.
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| CN113063755A (en) * | 2015-11-17 | 2021-07-02 | 韩国科学技术院 | Sample characteristic detection device using chaotic wave sensor |
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Application publication date: 20150715 |