CN102095805A - System and method for testing acoustic emission sensor based on laser Doppler principle - Google Patents
System and method for testing acoustic emission sensor based on laser Doppler principle Download PDFInfo
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- CN102095805A CN102095805A CN2009102496212A CN200910249621A CN102095805A CN 102095805 A CN102095805 A CN 102095805A CN 2009102496212 A CN2009102496212 A CN 2009102496212A CN 200910249621 A CN200910249621 A CN 200910249621A CN 102095805 A CN102095805 A CN 102095805A
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Abstract
The invention belongs to the field of test, measurement and calibration of sensors, and in particular relates to a system and a method for testing the sensitivity of an acoustic emission sensor. A system for testing the acoustic emission sensor based on a laser Doppler principle is used for testing the sensitivity of the acoustic emission sensor; and a sensitivity curve of the acoustic emission sensor is obtained according to a voltage spectrum and a velocity spectrum of the acoustic emission sensor which are measured by the system; and the displacement or displacement velocity of acoustic emission elastic waves is directly measured, accuracy of dozens of picometers can be achieved, the measured physical quantity can be traced to the source of time frequency, and a high-accuracy method is provided for testing the sensitivity of the acoustic emission sensor.
Description
Technical field
The invention belongs to sensor is carried out test and measuring calibration field, relate in particular to the system and method that the sensitivity of calibrate AE sensor is tested, test based on laser doppler technique especially.
Background technology
The phenomenon of local source snap-out release energy generation transient state elastic wave is called acoustic emission (AcousticEmission is called for short AE) in the material.In the application of acoustic emission, the working band of sensor and sensitivity have conclusive effect to the result that AE detects.The piezoelectric transducer that most of AE sensor is a mode of resonance in the practical application.The sensitivity of calibrate AE sensor is expressed in the mode of displacement sensitivity or velocity sensitivity, and how its frequency response being tested is the bottleneck of AE quantitative technique widespread use.
In the prior art, the method that american society for testing and materials and ISO (International Standards Organization) are recommended is the surface wave pulse method, on a steel test block surface that semiinfinite is big, mode with the kapillary fracture produces the pulse sound signal, use capacitive transducer as the reference sensor, utilize relative method to draw the sensitivity curve of AE sensor.There are some drawbacks in this method, the one, the comparatively harsh and difficulty of tracing to the source of the manufacturing conditions of capacitive transducer, the 2nd, capacitive transducer is easy to generate the surface quality that partial discharge phenomenon influences the steel test block up to the polarizing voltage of hundreds of volts, and the 3rd, the stability of glass capillary break signal and repeatability are not very desirable.
The method of another AE sensor test is the laser interferometer method, utilize the normal direction displacement or the velocity of displacement of the steel test block surface acoustic emission elastic wave after laser interferometer measurement polishes, because problems such as steel test block surface quality, the signal to noise ratio (S/N ratio) of measurement result is not very desirable.The contactless calibrate AE sensor of mentioning in " non-contact sensor in the acoustic emission research " literary composition that 2003 " Non-Destructive Testing " delivered mainly comprises based on the acoustic emission signal of laser interference method and measuring, and does not relate to the detection calibration of sensor itself.
Among the existing technology master, application number is 200420086062.0 broadband acoustic emission signal receiving sensor, utilize the reception of the series connection realization broadband acoustic emission signal of two or more narrow-band transducers, utilize this sensor to have the lower problem of transmitting sensitivity as emission sensor.
Summary of the invention
The present invention has researched and developed a kind of calibrate AE sensor test macro and method of testing thereof based on laser Doppler principle in order to solve the problem that the operation of surface wave impulse method is inconvenient and traceability is difficult to realize that exists in the prior art.
The present invention is as follows for the technical scheme that realizes the foregoing invention purpose and adopted,
A kind of calibrate AE sensor test macro based on laser Doppler principle, described system is used to detect the sensitivity of calibrate AE sensor; According to the voltage spectroscopy of the calibrate AE sensor of systematic survey and the sensitivity curve that velocity spectrum obtains described calibrate AE sensor;
Described system comprises exciting signal source, data acquisition system (DAS), laser-Doppler single-point vibration measuring unit, emission sound source, transmission medium and described calibrate AE sensor to be measured; Described emission sound source is by transmission medium and described calibrate AE sensor coupling to be measured; Described laser-Doppler single-point vibration measuring unit is arranged on the measured zone of described calibrate AE sensor;
Described emission sound source is transferred to the elastic wave that produces by described transmission medium the measured zone of described calibrate AE sensor; Described laser-Doppler single-point vibration measuring unit is measured because of vertically shaking the Doppler shift component that produces, and obtains the velocity of displacement spectrum of compressional wave; During test, described calibrate AE sensor receives the elastic wave of described emission sound source by described transmission medium, described calibrate AE sensor produces electric signal, and electric signal is gathered, and system obtains the sensitivity curve of described calibrate AE sensor according to the data of twice collection in front and back.
Described emission sound source is a piezoelectric transducer; Described emission sound source frequency range covers 100kHz-800kHz at least; Described piezoelectric transducer one end is connected with described exciting signal source, and described transmission medium is close to by couplant with the workplace of described piezoelectric transducer and is connected.Described transmission medium is an optical glass.
In the concrete test, described piezoelectric transducer is the broadband emission transducer; Comprise: taper type piezoelectric chip, potting resin, the backing that mixes of resin and tungsten powder, insulating supporting structure, resin backing, first electrode, second electricity, housing and matching layer; Described taper type piezoelectric chip polarization just produces two electricity levels after handling metal coating, be described first electrode and second electrode, because there is inverse piezoelectric effect in piezoelectric chip, when described taper type piezoelectric chip receives driving voltage, because inverse piezoelectric effect just produces the pressure signal of certain frequency scope and certain amplitude;
Described mixing backing sticks on described piezoelectric chip top, coaxial with piezoelectric chip, be used for and piezoelectric element between the acoustic impedance coupling an of the best is provided, the internal reflection that the resin backing of its top forms piezoelectric crystal suppresses as far as possible and the combination of taper type piezoelectric transducer can provide a broadband acoustic emission signal; The insulating supporting structure of annular is between housing and piezoelectric chip and the described back lining materials, by the position of the fixing described taper type piezoelectric crystal of described housing.
In the test macro, described laser-Doppler single-point vibration measuring unit comprises: He-Ne laser instrument, frequency mixer, first catoptron, double mirror, spectroscope, 1/2 wave plate, acoustooptic modulation crystal, birefraction prism, second catoptron, quarter wave plate and condenser lens; The frequency coverage of described laser-Doppler single-point vibration measuring unit is 100kHz-1MHz;
Described laser instrument 2 is launched laser, and through described spectroscope 6, light beam is divided into energy and equates two-beam, and is a branch of through double mirror 5 reflections, sends into described frequency mixer 3 conducts after the line focus with reference to light; Another bundle light then becomes polarized light by birefraction prism 9, passes through quarter wave plate 11 and condenser lens 12 through second catoptron, the 10 reflection backs of fine-tuning angle, vertically is mapped on the target face; Because of being subjected to elastic wave, target face produces weak vibration, frequency displacement can take place in the light that is reflected by target face, the light that frequency displacement takes place reflects through the certain low-angle of described birefraction prism 9 hour offsets and penetrates, after the modulation of described acoustooptic modulation crystal 8, again by described 1/2 wave plate compensation optical path difference, at last by the described two anti-mirror 5 and first catoptrons 4, line focus becomes measuring beam again, sends into described frequency mixer 3; Reference beam and measuring beam are exported the signal of a frequency for both frequency differences through described frequency mixer 3, and described signal is handled the velocity of displacement spectrum that obtains target face by described data acquisition system (DAS).
Among the present invention, described transmission medium is the optical glass of both ends of the surface polishing, and the zone line of one side is aluminized or chromium plating in this optical glass; Described optical glass both ends of the surface spacing is 120mm at least.
The method of testing of using above-mentioned test macro and carrying out is utilized inverse piezoelectric effect, adopts piezoelectric transducer as emission sound source; Described broadband emission transducer is coupling in an end of optical glass test block, will be measured by the compressional wave that the broadband emission transducer produces at the other end of optical glass test block, this end is coated with highly reflecting films;
Measure for the first time and finish, detect the acoustic emission signal at plated film place then by described calibrate AE sensor to be measured, contrast the waveform that receives for twice, obtain the sensitivity curve of described calibrate AE sensor by described laser-Doppler single-point vibration measuring unit.
Concrete described method of testing comprises two test phases:
(1) first test phase:
1.. described exciting signal source 18 produces elastic wave by described broadband emission transducer 17 in described transmission medium-optical glass;
2.. described elastic wave arrives the plated film planar survey zone coaxial with described broadband emission transducer 17 through transmission medium-optical glass test block;
3.. described laser-Doppler single-point vibration measuring unit is measured because the Doppler shift component that vertical vibrations of target face produce by described frequency mixer, is imported described data acquisition system (DAS) with signal, collects the velocity of displacement spectrum of compressional wave;
(2) second test phases:
1.. close described laser-Doppler single-point vibration measuring unit, described laser instrument is turned off;
2.. calibrate AE sensor 13 to be measured in described plated film face 14 1 sides coupling;
3.. described calibrate AE sensor 13 receives the compressional wave that described broadband emission transducer 17 sends, and produces faint electric signal, and its signal is the mV magnitude;
4.. the electric signal that described calibrate AE sensor 13 is produced is sent described signal into data acquisition system (DAS) behind prime amplifier 15, obtain the voltage spectroscopy of described calibrate AE sensor 13;
Described data acquisition system (DAS) obtains the electric signal output that signal that Doppler's vibration measuring system that two stages detect obtains and transducer place same position to obtain; Because the target face that obtains of laser-Doppler single-point vibration measuring unit is consistent with the coupling position of described calibrate AE sensor 13, then both velocity of displacement spectrums of producing when receiving identical elastic wave are consistent; Test macro is drawn its sensitivity curve according to the voltage spectroscopy and the velocity of displacement spectrum of known calibrate AE sensor to be measured 13.
The present invention proposes a kind of calibrate AE sensor method of testing and device based on laser Doppler principle, and this method and apparatus can accurately be tested the longitudinal frequency response curve of sensor 100kHz-800kHz to be measured.The present invention adopts inverse piezoelectric effect broadband emission transducer as emission sound source, adopt optical glass as the elastic wave transmission medium, the plated film that utilizes optical glass surface is as measured zone, measure measured zone displacement and the velocity of displacement of placing before AE passes sensor by laser Doppler principle, utilize the high-frequency data acquisition system to measure the voltage output of AE sensors coupled to the measured zone, draw the displacement response and the speed responsive of AE sensor.
In the displacement sensitivity measuring technique of calibrate AE sensor, the reference capacitance sensor can be measured the dynamic displacement of pm magnitude, but in the prior art capacitive transducer since surface smoothness require high and can not use for a long time; Among the present invention based on the calibrate AE sensor calibration steps of Doppler's principle then owing to use optical glass medium and coating technique, do not have this influence.
The present invention directly measures the displacement or the velocity of displacement of acoustic emission elastic wave, and absolute displacement can reach the precision of tens micromicron magnitudes, and the physical quantity of measurement can be traced to the source to temporal frequency, for the sensitivity test of calibrate AE sensor provides a kind of accuracy method.After the emission of broadband emission transducer, the voltage spectroscopy that sensor to be measured receives is compared with the velocity spectrum that Doppler's vibration measuring system obtains, and just can obtain its sensitivity curve, and accompanying drawing is the measurement sensitivity curve of typical resonant mode transducer, ordinate is dB, with respect to 1V/ (m/s).
Description of drawings
Fig. 1 is the structural representation of test macro of the present invention;
Fig. 2 is the structural drawing of broadband emission transducer;
The sensitivity curve figure that Fig. 3 obtains for the test calibrate AE sensor.
To describe above-mentioned each width of cloth accompanying drawing in conjunction with embodiment.
Wherein, among Fig. 1: 1 is data acquisition system (DAS), and 2 is the He-Ne laser instrument, and 3 is frequency mixer, 4 is first catoptron, and 5 is double mirror, and 6 is spectroscope, 7 is 1/2 wave plate, and 8 are the acoustooptic modulation crystal, and 9 is the birefraction prism, 10 is second catoptron, and 11 is quarter wave plate, and 12 is condenser lens, 13 is acoustic emission transducer to be measured, and 14 is coatings, and 15 is prime amplifier, 16 is the optical glass test block, and 17 is the broadband emission transducer, and 18 is exciting signal source;
Among Fig. 2: 19 is the taper type piezoelectric chip, and 20 is potting resin, and 21 is resin and the backing that mixes of tungsten powder, and 22 is insulating supporting structure, and 23 is the resin backing, and 24 is first electrode, and 25 is second electrode, and 26 is housing, and 27 is matching layer.
Embodiment
The present invention utilizes inverse piezoelectric effect, adopts piezoelectric transducer as emission sound source.The broadband emission transducer is coupling in the end with certain thickness optical glass test block, will be measured by the compressional wave that transducer produces at the other end of test block, this end is coated with highly reflecting films.Measure for the first time and finished by laser-Doppler single-point vibration measuring unit, detected the acoustic emission signal at plated film place then by calibrate AE sensor to be measured, contrast the waveform that receives for twice, the sensitivity curve of calibrate AE sensor just can be provided by a frequency function.
Laser-Doppler single-point vibration measuring unit is comprised he-ne laser tube, beam splitter, prism, focus lamp, quarter-wave plate, 1/2nd wave plates, is with modulation crystal, planoconvex lens and the frequency mixer and the high-speed data acquistion system that drive to build by optical device, when the flexible ripple of target face transmits, according to laser Doppler principle, Doppler shift will take place in the light of reflected back, this device can collect frequency shift signal, promptly can calculate the length travel of target surface tens micromicron levels again by signal processing technology.The measurement bandwidth of system covers the frequency range of 100kHz-1MHz at least.
The broadband emission transducer by platform taper piezoelectric crystal, tungsten powder and the resin compound of radial polarization as backing, thin alumina wafer or piezoelectric ceramics as matching layer, its bandwidth covers 100kHz-800kHz at least, wherein the diameter of frustum and matching layer surface of contact is not more than 1mm, and matching layer thickness is less than 0.5mm.
In Fig. 1, he-ne laser tube 2 is launched laser, and through five or five spectroscopes 6, light beam is divided into energy and equates two-beam, and two anti-mirror 5 reflections of a branch of warp are sent into balanced mixer as the reference light beam after the line focus.Another bundle light then becomes polarized light by calcite prism 9, passes through quarter-wave plate 11 and focus lamp 12 through second catoptron, the 10 reflection backs of fine-tuning angle, vertically is mapped on the target face 14.Because target face is subjected to elastic wave to produce weak vibration, be that the receptacle position changes, by Doppler's principle, frequency displacement can take place in the light that is reflected by target face, the light that frequency displacement takes place reflects through the certain low-angle of calcite prism 9 hour offsets and penetrates, after the modulation of acoustooptic modulation crystal 8, again by 1/2nd wave plates compensation optical path difference, at last by the two anti-mirrors 5 and first catoptron 4, line focus becomes measuring beam again, sends into balanced mixer 3.Reference beam and measuring beam are through balanced mixer 3, and an exportable frequency is the signal of both frequency differences, and signal can be handled the velocity of displacement spectrum that obtains target face by high-speed data acquisition thus.
Among the present invention, test process is divided into 2 steps, for the first time test and excitation signal source 18 produces elastic wave by broadband emission transducer 17 in optical glass, through the transmission medium glass test block arrival plated film planar survey zone coaxial with transmitting transducer, measure because the Doppler shift component that vertical vibrations of target face produce based on the single-point displacement measurement system of laser Doppler principle, by frequency mixer, obtain the velocity of displacement spectrum of compressional wave.Test for the second time: the laser-Doppler vibration measuring system is closed, the laser tube power supply is turned off, calibrate AE sensor 13 is gone up in the coupling of plated film 14 1 sides, calibrate AE sensor 13 receives the compressional wave that transmitting transducer 17 sends, produce faint electric signal, through prime amplifier 15, signal is sent into high-speed data acquistion system, obtain the voltage spectroscopy of calibrate AE sensor 13.Because the target face that obtains of laser-Doppler vibration measuring system is consistent with the coupling position of calibrate AE sensor 13, can think that the velocity of displacement spectrum that both produce when receiving identical elastic wave is consistent.At this moment, the voltage spectroscopy of calibrate AE sensor 13 and velocity of displacement spectrum are all known, can draw out its sensitivity curve.
The present invention directly measures the displacement or the velocity of displacement of acoustic emission elastic wave, and absolute displacement can reach the precision of tens micromicron magnitudes, and the physical quantity of measurement can be traced to the source to temporal frequency, for the sensitivity test of calibrate AE sensor provides a kind of accuracy method.After the emission of broadband emission transducer, the voltage spectroscopy that sensor to be measured receives is compared with the velocity spectrum that Doppler's vibration measuring system obtains, and just can obtain its sensitivity curve, and accompanying drawing is the measurement sensitivity curve of typical resonant mode transducer, ordinate is dB, with respect to 1V/ (m/s).
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned embodiment of the present invention, therefore previously described mode is preferably, and does not have restrictive meaning.
Claims (9)
1. the calibrate AE sensor test macro based on laser Doppler principle is characterized in that described system is used to detect the sensitivity of calibrate AE sensor; According to the voltage spectroscopy of the calibrate AE sensor of systematic survey and the sensitivity curve that velocity spectrum obtains described calibrate AE sensor;
Described system comprises laser-Doppler single-point vibration measuring unit, emission sound source, transmission medium and described calibrate AE sensor to be measured; Described emission sound source is by transmission medium and described calibrate AE sensor coupling to be measured; Described laser-Doppler single-point vibration measuring unit is arranged on the measured zone of described calibrate AE sensor;
Described emission sound source is transferred to the elastic wave that produces by described transmission medium the measured zone of described calibrate AE sensor; Described laser-Doppler single-point vibration measuring unit is measured because of vertically shaking the Doppler shift component that produces, and obtains the velocity of displacement spectrum of compressional wave; During test, described calibrate AE sensor receives the elastic wave of described emission sound source by described transmission medium, described calibrate AE sensor produces electric signal, and electric signal is gathered, and system obtains the sensitivity curve of described calibrate AE sensor according to the data of twice collection in front and back.
2. according to the described a kind of calibrate AE sensor test macro of claim 1, it is characterized in that described system also comprises exciting signal source and data acquisition system (DAS) based on laser Doppler principle;
Described emission sound source is a piezoelectric transducer; Described emission sound source frequency range covers 100kHz-800kHz at least; Described piezoelectric transducer one end is connected with described exciting signal source, and described transmission medium is close to by couplant with the workplace of described piezoelectric transducer and is connected.
3. a kind of calibrate AE sensor test macro based on laser Doppler principle according to claim 2 is characterized in that,
Described piezoelectric transducer is the broadband emission transducer; Comprise: taper type piezoelectric chip, potting resin, the backing that mixes of resin and tungsten powder, insulating supporting structure, resin backing, first electrode, second electrode, housing and matching layer; Described broadband emission transducer integral body is column structure;
Described taper type piezoelectric chip polarization just produces two electricity levels after handling metal coating, be described first electrode and second electrode, because there is inverse piezoelectric effect in piezoelectric chip, when described taper type piezoelectric chip receives driving voltage, because inverse piezoelectric effect just produces the pressure signal of certain frequency scope and certain amplitude;
Described mixing backing sticks on described piezoelectric chip top, coaxial with piezoelectric chip, be used for and piezoelectric element between the acoustic impedance coupling an of the best is provided, the internal reflection that the resin backing of its top forms piezoelectric crystal suppresses as far as possible and the combination of taper type piezoelectric transducer can provide a broadband acoustic emission signal; The insulating supporting structure of annular is between housing and piezoelectric chip and the described back lining materials, by the position of the fixing described taper type piezoelectric crystal of described housing.
4. a kind of calibrate AE sensor test macro based on laser Doppler principle according to claim 1 and 2 is characterized in that,
Described laser-Doppler single-point vibration measuring unit comprises: laser instrument, frequency mixer, first catoptron, double mirror, spectroscope, 1/2 wave plate, acoustooptic modulation crystal, birefraction prism, second catoptron, quarter wave plate and condenser lens; The frequency coverage of described laser-Doppler single-point vibration measuring unit is 100kHz-1MHz;
Described laser instrument (2) is launched laser, and through described spectroscope (6), light beam is divided into energy and equates two-beam, and is a branch of through double mirror (5) reflection, sends into described frequency mixer (3) conduct after the line focus with reference to light; Another bundle light then becomes polarized light by birefraction prism (9), passes through quarter wave plate (11) and condenser lens (12) through second catoptron (10) the reflection back of fine-tuning angle, vertically is mapped on the target face; Because of being subjected to elastic wave, target face produces weak vibration, frequency displacement can take place in the light that is reflected by target face, the light that frequency displacement takes place reflects through the certain low-angle of described birefraction prism (9) hour offset and penetrates, after the modulation of described acoustooptic modulation crystal (8), again by described 1/2 wave plate compensation optical path difference, at last by described two anti-mirror (5) and first catoptrons (4), line focus becomes measuring beam again, sends into described frequency mixer (3); Reference beam and measuring beam are exported the signal of a frequency for both frequency differences through described frequency mixer (3), and described signal is handled the velocity of displacement spectrum that obtains target face by described data acquisition system (DAS).
5. a kind of calibrate AE sensor test macro based on laser Doppler principle according to claim 1 is characterized in that,
Described transmission medium is an optical glass.
6. a kind of according to claim 1 or 5 calibrate AE sensor test macro based on laser Doppler principle is characterized in that,
Described transmission medium is the optical glass of both ends of the surface polishing, and the zone line of one side is aluminized or chromium plating in this optical glass; Described optical glass both ends of the surface spacing is 120mm at least.
7. according to claim 1 or 4 described a kind of calibrate AE sensor test macros, it is characterized in that based on laser Doppler principle,
Described test macro also comprises prime amplifier (15); And the laser instrument in laser-Doppler single-point vibration measuring unit is the He-Ne laser instrument;
Described calibrate AE sensor to be measured receives the compressional wave that described broadband emission transducer (17) sends, and producing its signal of ultra-weak electronic signal is the mV magnitude; And with this electric signal behind described prime amplifier (15), described signal is sent into described data acquisition system (DAS), obtain the voltage spectroscopy of described calibrate AE sensor (13).
8. use the method for carrying out the calibrate AE sensor test as the test macro of one of claim 1-7, it is characterized in that,
Described method of testing is utilized inverse piezoelectric effect, adopts piezoelectric transducer as emission sound source; Described broadband emission transducer is coupling in an end of optical glass test block, will be measured by the compressional wave that the broadband emission transducer produces at the other end of optical glass test block, this end is coated with highly reflecting films;
Measure for the first time and finish, detect the acoustic emission signal at plated film place then by described calibrate AE sensor to be measured, contrast the waveform that receives for twice, obtain the sensitivity curve of described calibrate AE sensor by described laser-Doppler single-point vibration measuring unit.
9. the calibrate AE sensor method of testing based on laser Doppler principle according to claim 8 is characterized in that,
Described method of testing comprises two test phases:
(1) first test phase:
1.. described exciting signal source (18) produces elastic wave by described broadband emission transducer (17) in described transmission medium-optical glass;
2.. described elastic wave arrives the plated film planar survey zone coaxial with described broadband emission transducer (17) through transmission medium-optical glass test block;
3.. described laser-Doppler single-point vibration measuring unit is measured because the Doppler shift component that vertical vibrations of plated film measurement target face produce by described frequency mixer, is imported described data acquisition system (DAS) with signal, collects the velocity of displacement spectrum of compressional wave;
(2) second test phases:
1.. close described laser-Doppler single-point vibration measuring unit, described laser instrument is turned off;
2.. go up calibrate AE sensor to be measured (13) in described plated film face (14) one sides coupling;
3.. described calibrate AE sensor (13) receives the compressional wave that described broadband emission transducer (17) sends, and produces ultra-weak electronic signal;
4.. the electric signal that described calibrate AE sensor (13) is produced is sent described signal into data acquisition system (DAS) behind prime amplifier (15), obtain the voltage spectroscopy of described calibrate AE sensor (13);
Described data acquisition system (DAS) obtains the electric signal output that signal that Doppler's vibration measuring system that two stages detect obtains and transducer place same position to obtain; Because the target face that obtains of laser-Doppler single-point vibration measuring unit is consistent with the coupling position of described calibrate AE sensor (13), then both velocity of displacement spectrums of producing when receiving identical elastic wave are consistent; Test macro is drawn its sensitivity curve according to the voltage spectroscopy and the velocity of displacement spectrum of known calibrate AE sensor to be measured (13).
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| CN102590356A (en) * | 2012-01-16 | 2012-07-18 | 北京理工大学 | Device for measuring sensitivity of acoustic emission sensor |
| CN102621235A (en) * | 2012-03-20 | 2012-08-01 | 北京理工大学 | Transmission-type method for measuring sensitivity of acoustic emission sensor |
| CN103115967A (en) * | 2013-01-21 | 2013-05-22 | 济南大学 | Acoustic emission sensor as well as preparation method and application thereof |
| CN106124032A (en) * | 2016-08-25 | 2016-11-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | The digital measuring method of a kind of optical frequency modulators modulate delay and device |
| CN109579971A (en) * | 2018-10-17 | 2019-04-05 | 中国科学院声学研究所 | A kind of system and method carrying out ultrasonic quantitative measurement using laser doppler |
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| CN102590356A (en) * | 2012-01-16 | 2012-07-18 | 北京理工大学 | Device for measuring sensitivity of acoustic emission sensor |
| CN102621235A (en) * | 2012-03-20 | 2012-08-01 | 北京理工大学 | Transmission-type method for measuring sensitivity of acoustic emission sensor |
| CN103115967A (en) * | 2013-01-21 | 2013-05-22 | 济南大学 | Acoustic emission sensor as well as preparation method and application thereof |
| CN106124032A (en) * | 2016-08-25 | 2016-11-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | The digital measuring method of a kind of optical frequency modulators modulate delay and device |
| CN106124032B (en) * | 2016-08-25 | 2021-11-30 | 中国航空工业集团公司北京长城计量测试技术研究所 | Digital measurement method and device for modulation delay of optical frequency modulator |
| CN109752461B (en) * | 2017-11-08 | 2021-04-02 | 哈尔滨工业大学 | Segmented minimum mean square adjustment deconvolution steel rail crack signal restoration method |
| CN109752461A (en) * | 2017-11-08 | 2019-05-14 | 哈尔滨工业大学 | A kind of improved segmented adjusting lowest mean square deconvolution rail cracks signal restoring method |
| CN109579971A (en) * | 2018-10-17 | 2019-04-05 | 中国科学院声学研究所 | A kind of system and method carrying out ultrasonic quantitative measurement using laser doppler |
| CN109579971B (en) * | 2018-10-17 | 2020-08-04 | 中国科学院声学研究所 | System and method for ultrasonic quantitative measurement by using laser Doppler effect |
| CN110044462A (en) * | 2019-04-29 | 2019-07-23 | 北京工业大学 | A kind of laser heterodyne interference doppler vibration measuring optical texture |
| CN110108504A (en) * | 2019-05-13 | 2019-08-09 | 桂林电子科技大学 | The non-contact excitation of cargo vehicle body mode and non-cpntact measurement acquisition methods |
| CN112557515A (en) * | 2020-10-30 | 2021-03-26 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Acoustic emission sensor test system |
| CN112557515B (en) * | 2020-10-30 | 2023-12-12 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Acoustic emission sensor test system |
| CN113433385A (en) * | 2021-06-22 | 2021-09-24 | 华北电力大学 | Elastic wave detection platform based on photoelastic effect |
| CN114397369A (en) * | 2021-12-31 | 2022-04-26 | 临沂大学 | A can bury multidimensional acoustic emission sensor for concrete damage monitoring |
| CN114397369B (en) * | 2021-12-31 | 2023-12-22 | 临沂大学 | A can embed multidimensional acoustic emission sensor for concrete damage monitoring |
| CN117434163A (en) * | 2023-12-20 | 2024-01-23 | 中煤科工开采研究院有限公司 | Calibration device and method for acoustic emission sensor |
| CN117434163B (en) * | 2023-12-20 | 2024-04-16 | 中煤科工开采研究院有限公司 | Calibration device and method for acoustic emission sensor |
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