CN102944613B - Detecting and positioning system for optical fiber acoustic emission - Google Patents
Detecting and positioning system for optical fiber acoustic emission Download PDFInfo
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- CN102944613B CN102944613B CN201210464956.8A CN201210464956A CN102944613B CN 102944613 B CN102944613 B CN 102944613B CN 201210464956 A CN201210464956 A CN 201210464956A CN 102944613 B CN102944613 B CN 102944613B
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Abstract
The invention discloses a detecting and positioning system for optical fiber acoustic emission, which comprises an optical fiber laser sensor strain rosette, an optical fiber laser sensor strain rosette base plate, an acoustic coupling agent, an optical fiber signal demodulating device and an acoustic emission source positioning device, wherein the optical fiber laser sensor strain rosette is formed by serially connecting a plurality of optical fiber laser sensors; the optical fiber laser sensor strain rosette base plate is used for packaging and fixing the optical fiber laser sensors and transmitting an acoustic emission signal; the acoustic coupling agent is used for coupling the optical fiber laser sensors and transmitting the acoustic emission signal; the optical fiber signal demodulating device is used for receiving and demodulating an optical signal generated by the optical fiber laser sensors caused by the acoustic emission signal; and the acoustic emission source positioning device is used for realizing the positioning for an acoustic emission source on the basis of a demodulating result of the optical fiber signal demodulating device for the optical signal. The detecting and positioning system for the optical fiber acoustic emission is utilized to increase the capabilities of detecting a weak acoustic emission signal and positioning the acoustic emission source and to solve the problems of low sensitivity of an acoustic emission sensor in the detection of the weak acoustic emission signal, complex positioning, electromagnetic interference, poor capabilities of resisting high temperature and high pressure as well as strong corrosion environment, long-distance signal real-time transmission, long-term continuous observation, and the like.
Description
Technical field
The present invention relates to acoustic emission testing technology field, particularly relate to a kind of optical fiber acoustic emission detection and positioning system of superhigh precision.
Background technology
Acoustic emission (Acoustic Emission, AE) be also called stress wave to launch, be local source quick release of energy and produce a kind of phenomenon of Elastic wave in material, and majority is the weak vibration or surface displacement that just can only detect with high sensor.The observation of acoustic emission phenomenon originates from seismic monitoring, in the middle of the industry-by-industry such as Acoustic emission being widely used in rock burst monitoring, the acoustic emission detection of pressure vessel and aerospace components, monitoring structural health conditions and compound substance now, and play the irreplaceable effect of other lossless detection methods.
Make a general survey of the developing history of acoustic emission testing technology, traditional calibrate AE sensor many employings resonant mode piezoelectric sensor, its major defect is: volume is large, and frequency band is narrow, and necessary and object contact, can not use under the rugged surroundings such as high temperature, strong electromagnetic, corrosion.A kind of calibrate AE sensor (Chinese patent application CN101502947A) etc. that the people such as a kind of calibrate AE sensor (Chinese patent application CN201074528Y), Ben Yu that the people such as small sized wide-band sound-emission sensor (Chinese patent application CN1051087A), Liu Sheng that the people such as such as Zhang Ke propose proposes proposes.
From the end of the eighties in last century, developing rapidly along with optical fiber sensing technology, has extensively carried out the research work of Optical Fiber Acoustic Emission Detection Technology both at home and abroad.Compare traditional calibrate AE sensor, it is little that Optical Fibre Acoustic Emission Sensor has volume, bandwidth, and damaging thresholding is high, need not contact and maybe can be embedded in structured material inside, be applicable to the advantages such as rugged surroundings such as high temperature, strong electromagnetic, corrosion with testee.The dissimilar Optical Fibre Acoustic Emission Sensor such as intensity modulation type, phase modulation-type (interfere type), wavelength-modulated type are successfully developed, and are applied to on-the-spot acoustic emission detection.Originally (1980 ~ 2000), Optical Fiber Acoustic Emission Detection Technology mostly adopts the optical fibre sensor structure of interfere type.During the nearly last ten years, along with the development of the manufacturing technology of fiber grating (FBG) sensor and the successful Application at industry-by-industry thereof, acoustic emission detection scheme based on FBG sensor obtains extensive concern (IgnacioPerez et., " Acoustic Emission Detection U sing F iber Bragg Gratings ", SMARTMATERIALS AND STRUCTURES, 2001).
Relative to the interference Optical Fiber Acoustic Emission Sensor that early stage is extensively studied, FBG sensor has less volume and quality, and adopt Wavelength-encoding not by light source power influence of fluctuations, be easy to networking, form large area delamination damage monitoring system, specifically FBG also has acoustic emission detection direction characteristic, FBG strain rosette can be built to realize location (the G THURABY et. of acoustic emission source, " Multifunctional fibre optic sensors monitoring strain and ultrasound ", Fatigue & Fracture of Engineering Materials & Structures, 2008), this has also become the study hotspot nearly ten years in optical fiber acoustic emission detection.Such as, fiber grating strain flower (U.S. patent Nos US6586722) etc. that the people such as a kind of acoustic emission signal sensor-based system based on Fiber Bragg Grating FBG (Chinese invention patent CN102313779A), Kenny that the people such as the fiber grating acoustic emission that provides of Guan Baiou and temperature sensor (Chinese invention patent CN1818625A), Wei Peng provides provides.But yet there are no the report utilizing FBG strain rosette simultaneously to realize continuous type and demblee form two kinds of acoustic emission signal detecting and locatings.
In recent years, fiber laser sensor (FLs) shows huge potentiality at sensory field of optic fibre, except having, common FBG sensor construction is simple, electromagnetism interference, size are little and set up easily through wavelength-division multiplex except the advantages such as sensing network for it, also there is the advantages such as single-frequency, narrow linewidth, high power, ultra-low noise simultaneously, can realize the detection of supersensitive Dynamic Signal in conjunction with high resolution wavelength demodulation techniques, this has incomparable advantage in signal detection.Therefore FLs is used in acoustic emission detection, not only can obtain, than FBG type calibrate AE sensor, there is higher detection sensitivity (C-C Ye.et, " Ultrasonic sensing using Yb3+/Er3+-codoped distributedfeedback fibre grating lasers ", SMART MATERIAL S AND S TRUCTURE S, 2005), simultaneously because optical-fiber laser calibrate AE sensor is relative to the interference Optical Fiber Acoustic Emission Sensor of extensively research, its physical dimension is little, be easy to networking, this has very large technical advantage in acoustic emission detection and location.But up to the present, relevant report be yet there are no to the research of the acoustic emission direction characteristic of FLs.
Given this, the present invention proposes a kind of optical fiber acoustic emission detection and positioning system of superhigh precision, adopt the fiber laser sensor technique construction fiber laser sensor strain rosette of recent development, and for continuous type and demblee form two kinds of acoustic emission signals, the direction characteristic of fiber laser is utilized to realize two kinds of different acoustic emission source location algorithms, carry out the detection & localization of continuous type and burst acoustic emission signal simultaneously, and the sensitivity that emphasis solves calibrate AE sensor in the detection of faint acoustic emission signal is not high, location is complicated, electromagnetic interference (EMI), high temperature resistant, high pressure, strong corrosive environment ability, and the problem such as long range signals real-time Transmission and long-term Continuous Observation.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is to provide a kind of optical fiber acoustic emission detection and positioning system of superhigh precision, with the ability improving the faint acoustic emission signal of detection and position acoustic emission source, and the sensitivity solving calibrate AE sensor in the detection of faint acoustic emission signal is not high, location is complicated, electromagnetic interference (EMI), high temperature resistant, high pressure, strong corrosive environment ability, the problems such as long range signals real-time Transmission and long-term Continuous Observation.
(2) technical scheme
For achieving the above object, the invention provides a kind of optical fiber acoustic emission detection and positioning system, this system comprises: the fiber laser sensor strain rosette 8 be in series by multiple fiber laser sensor 5; Encapsulation is fixed the plurality of fiber laser sensor 5 and is transmitted the fiber laser sensor strain rosette base plate 4 of acoustic emission signal; Be coupled the plurality of fiber laser sensor 5 transmit the acoustic couplant 7 of acoustic emission signal; The fiber-optic signal demodulating equipment 2 of the optical signalling that the reception fiber laser sensor 5 that also demodulation is caused by acoustic emission signal produces; And the acoustic emission source locating device 1 of acoustic emission source location is realized based on the result that fiber-optic signal demodulating equipment 2 pairs of optical signallings demodulate.
In such scheme, described fiber laser sensor 5 is DBR type (DBR) fiber laser sensor or distribution bragg feedback-type (DFB) fiber laser sensor, can experience acoustic emission signal and this acoustic emission signal be changed into the change of its output wavelength.
In such scheme, described fiber laser sensor 5 has three at least, and these at least three fiber laser sensors 5 in same plane, be not parallel to each other, fiber laser sensor strain rosette 8 in series.
In such scheme, described fiber laser sensor 5 is three, and these three fiber laser sensors 5 form equilateral triangle or isosceles right triangle.
In such scheme, described fiber laser sensor strain rosette base plate 4 and acoustic couplant 7 are and can carry out the material of acoustic matching with matrix.
In such scheme, described fiber laser sensor strain rosette base plate 4 is bonded in the surface of matrix by colloid, or by described fiber laser sensor strain rosette base plate 4 and on fiber laser sensor strain rosette 8 be coupled to the inside of matrix together with acoustic couplant 7, to realize acoustic emission signal detection neatly and acoustic emission source is located.
In such scheme, described fiber-optic signal demodulating equipment 2 is a kind of high-precision fiber laser sensor demodulating equipment.Described fiber-optic signal demodulating equipment 2 is the fiber laser sensor demodulating equipment based on principle of interference and phase carrier (PGC) algorithm, and its dynamic strain resolution can reach 10
-6pm.
In such scheme, described acoustic emission source locating device 1 can realize according to the direction characteristic of fiber laser sensor acoustic emission signal locating or according to the acoustic emission source location that time difference method positions, adopting continuous acoustic emission signal location algorithm or burst acoustic emission signal location algorithm to realize the detecting and locating of continuous type or demblee form two kinds of acoustic emission signals.When described acoustic emission source locating device 1 adopts continuous acoustic emission signal location algorithm, locate relative to the deflection relational implementation of fiber laser sensor 5 according to fiber laser sensor 5 wave length shift amplitude and acoustic emission signal; When described acoustic emission source locating device 1 adopts burst acoustic emission signal location algorithm, wavelet energy number percent and the acoustic emission signal of the different frequency composition of one side foundation fiber laser sensor 5 wavelength signals are located relative to the deflection relational implementation of fiber laser sensor 5, and the mistiming that another aspect arrives different fiber laser sensor strain rosettes 8 according to acoustic emission signal realizes location.
(3) beneficial effect
As can be seen from technique scheme, the present invention has following beneficial effect:
1, optical fiber acoustic emission detection provided by the invention and positioning system, adopts high sensitivity and wide band fiber laser sensor, can improve the ability detecting faint acoustic emission signal.
2, optical fiber acoustic emission detection provided by the invention and positioning system, by by fiber laser strain rosette in series for fiber laser, and for continuous type and burst acoustic emission signal, the direction characteristic of fiber laser is utilized to realize two kinds of different acoustic emission source location algorithms, carry out the detection & localization of continuous type and burst acoustic emission signal simultaneously, greatly can reduce the complexity of acoustic emission source location.
3, optical fiber acoustic emission detection provided by the invention and positioning system, fiber laser is adopted to substitute conventional electrical acoustic emission probe, be a kind of full photo measure method, therefore the problems such as electromagnetism interference performance in acoustic emission detection is weak, high temperature resistant, high pressure, strong corrosive environment ability can be solved.
4, optical fiber acoustic emission detection provided by the invention and positioning system, adopt optical cable to carry out Signal transmissions, light signal is insensitive to electrical signal, is easy to realize long range signals real-time Transmission and long-term Continuous Observation.
Accompanying drawing explanation
Fig. 1 is provided by the invention based on the acoustic emission detection of fiber laser sensor strain rosette and the schematic diagram of positioning system;
Fig. 2 is provided by the invention based on the acoustic emission detection of fiber laser sensor strain rosette array and the schematic diagram of positioning system;
Fig. 3 is the schematic diagram of the continuous acoustic emission signal that 3 fiber laser sensors in single fiber laser sensor strain rosette provided by the invention record;
Fig. 4 is the schematic diagram of the burst acoustic emission signal that 3 fiber laser sensors in single fiber laser sensor strain rosette provided by the invention record;
Fig. 5 is fiber laser sensor wave length shift amplitude provided by the invention and the acoustic emission signal deflection relation curve relative to fiber laser sensor;
Fig. 6 is the wavelet energy number percent of the different frequency composition of fiber laser sensor wavelength signals provided by the invention and the acoustic emission signal deflection relation curve relative to fiber laser sensor.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Please refer to Fig. 1 and Fig. 2, wherein Fig. 1 is provided by the invention based on the acoustic emission detection of fiber laser sensor strain rosette and the schematic diagram of positioning system, and Fig. 2 is provided by the invention based on the acoustic emission detection of fiber laser sensor strain rosette array and the schematic diagram of positioning system.
As shown in Figure 1, this optical fiber acoustic emission detection provided by the invention and positioning system, comprise: the fiber laser sensor strain rosette 8 be in series by multiple fiber laser sensor 5, its tail optical fiber is drawn by optical cable 6, and fiber laser sensor 5 is for detecting acoustic emission signal; Encapsulation is fixed the plurality of fiber laser sensor 5 and is transmitted the fiber laser sensor strain rosette base plate 4 of acoustic emission signal; Be coupled the plurality of fiber laser sensor 5 transmit the acoustic couplant 7 of acoustic emission signal; The fiber-optic signal demodulating equipment 2 of the optical signalling that the reception fiber laser sensor 5 that also demodulation is caused by acoustic emission signal produces; And the acoustic emission source locating device 1 of acoustic emission source location is realized based on the result that fiber-optic signal demodulating equipment 2 pairs of optical signallings demodulate.
Wherein, fiber laser sensor 5 is DBR type (DBR) fiber laser sensor or distribution bragg feedback-type (DFB) fiber laser sensor, can experience acoustic emission signal and this acoustic emission signal be changed into the change of its output wavelength.Optical-fiber laser type sensor takes into account traditional passive optical fiber grating sensor and the advantage of interference type optical fiber sensor, has the advantage of high sensitivity, little size and long-time stability.
In the present invention, fiber laser sensor 5 has three at least, and these at least three fiber laser sensors 5 in same plane, be not parallel to each other, fiber laser sensor strain rosette 8 in series.When fiber laser sensor 5 is three, these three fiber laser sensors 5 form equilateral triangle, isosceles right triangle or lay the Y-shaped structure etc. of 3 fiber laser sensors every 120 °.
In the present invention, fiber laser sensor strain rosette base plate 4 and acoustic couplant 7 are and can carry out the material of acoustic matching with matrix.Such as, if matrix is marble, so base plate can be also marble, grouan etc., and acoustic couplant can be 353ND, 7S811 etc.
In the present invention, fiber laser sensor strain rosette base plate 4 is bonded in the surface of matrix by colloid, or by described fiber laser sensor strain rosette base plate 4 and on fiber laser sensor strain rosette 8 be coupled to the inside of matrix together with acoustic couplant 7, to realize acoustic emission signal detection neatly and acoustic emission source is located.
In the present invention, fiber-optic signal demodulating equipment 2 is a kind of high-precision fiber laser sensor demodulating equipment.Fiber-optic signal demodulating equipment 2 is the fiber laser sensor demodulating equipment based on principle of interference and phase carrier (PGC) algorithm, and its dynamic strain resolution can reach 10
-6pm.
In the present invention, acoustic emission source locating device 1 can realize according to the direction characteristic of fiber laser sensor acoustic emission signal locating or according to the acoustic emission source location that time difference method positions, adopting continuous acoustic emission signal location algorithm or burst acoustic emission signal location algorithm to realize the detecting and locating of continuous type or demblee form two kinds of acoustic emission signals.The direction characteristic of fiber laser sensor acoustic emission signal is verified by experiment, can carry out similar experiment with reference to the relevant report of the existing direction characteristic about fiber grating (FBG) sensor acoustic emission signal.
When described acoustic emission source locating device 1 adopts continuous acoustic emission signal location algorithm, locate relative to the deflection relational implementation of fiber laser sensor 5 according to fiber laser sensor 5 wave length shift amplitude and acoustic emission signal; When described acoustic emission source locating device 1 adopts burst acoustic emission signal location algorithm, wavelet energy number percent and the acoustic emission signal of the different frequency composition of one side foundation fiber laser sensor 5 wavelength signals are located relative to the deflection relational implementation of fiber laser sensor 5, and the mistiming that another aspect arrives different fiber laser sensor strain rosettes 8 according to acoustic emission signal realizes location.When poor method carries out acoustic emission source location when utilized, the installation process of branched fiber laser sensor 5, ensures to have identical axial direction as far as possible.
In the present invention, a fiber laser sensor 5 (type of this fiber laser sensor is consistent with the type of 3 fiber laser sensors be arranged on fiber laser sensor strain rosette base plate) can also be encapsulated by sound insulating material on fiber laser sensor strain rosette base plate 4, or design a kind of sound isolated chambers and sound isolation is carried out, for the temperature compensation of fiber laser sensor strain rosette 8 to this fiber laser sensor 5.
As shown in Figure 2, in order to determine the position of acoustic emission source more accurately, can on matrix installing optical fibres laser sensor strain rosette 4 array, different fiber laser sensor strain rosettes 4 is connected by optical cable (such as armored optical cable), carry out acoustic emission source location by fiber-optic signal demodulating equipment 2 harmony emission source positioning device 1, greatly can improve the precision of acoustic emission source location like this.
The principle of work of optical fiber acoustic emission detection provided by the invention and positioning system is as follows: when matrix material inside produces defect, acoustic emission wave (AE ripple) will spread therein, when AE ripple arrives voice sending sensor region (i.e. fiber laser sensor strain rosette 8), the faint disturbance (surface displacement) in this region will be caused, and pass through colloid, fiber laser sensor strain rosette base plate 4, acoustic couplant 7 passes to fiber laser sensor 5, this just modulates the reflection wavelength of fiber laser 5, just the detection to acoustic emission signal can be realized again by fiber-optic signal demodulating equipment 2.In addition, according to the acoustic emission direction characteristic of fiber laser sensor 5, use one by 3 and the above fiber laser sensor 5 not in same plane connect build fiber laser sensor strain rosette 8, the location of acoustic emission source can be realized by acoustic emission source locating device 1.
In order to improve the precision of acoustic emission source location further, can on matrix material installing optical fibres laser sensor strain rosette 8 array, to reduce to use single optical fiber laser sensor strain rosette 8 to carry out the error of acoustic emission source location.
Please refer to Fig. 3, in order to verify the ability of fiber laser strain rosette detection continuous acoustic emission signal, the present invention is installed on block of marble plate carries out acoustic emission detection experiment, can find out that 3 fiber laser sensors 5 of fiber laser sensor strain rosette 8 clearly can both be recorded to sinusoidal signal, and there is lower noise level.
Please refer to Fig. 4, in order to verify the ability of fiber laser strain rosette probe burst type acoustic emission signal, the present invention is installed on block of marble plate equally carries out acoustic emission detection experiment, can find out that 3 fiber laser sensors 5 of fiber laser sensor strain rosette 8 clearly can both be recorded to impact signal, and there is lower noise level.
Please refer to Fig. 5, in order to verify fiber laser sensor wave length shift amplitude and the acoustic emission signal deflection relation relative to fiber laser sensor, the direction characteristic of the present invention to single the sinusoidal wave acoustic emission signal of fiber laser sensor detection continuous type is tested.In experimentation, single fiber laser sensor 5 is arranged on the certain angle direction (a piezo-electric type acoustic emission probe is installed in this position simultaneously) on matrix material, then circumferentially respectively acoustic emission signal transmitting probe is installed in distance fiber laser sensor 5 same distance, the frequency of acoustic emission signal is controlled and amplitude remains unchanged by signal generator, the signal measuring circumferentially diverse location place acoustic emission causes the wave length shift value of fiber laser, and is depicted as curve.As can be seen from Figure 5 fiber laser sensor wave length shift amplitude and acoustic emission signal present bathtub shaped curve relation relative to the deflection relation of fiber laser sensor.
Please refer to Fig. 6, in order to verify the wavelet energy number percent of the different frequency composition of fiber laser sensor wavelength signals and the acoustic emission signal deflection relation relative to fiber laser sensor, the present invention tests to the direction characteristic of single fiber laser sensor probe burst type impact signal.Similar, in experimentation, single fiber laser sensor 5 is arranged on the certain angle direction (a piezo-electric type acoustic emission probe is installed in this position simultaneously) on matrix material, then at distance fiber laser sensor 5 same distance diverse location place circumferentially, respectively at identical At The Height by steel ball free falling bodies, simulation impact signal, and then the impact signal measuring circumferentially diverse location place causes the wavelet energy number percent of the wave length shift value of fiber laser under a certain frequency, and be depicted as curve.As can be seen from Figure 6 the wavelet energy number percent of a certain frequency content of fiber laser sensor wavelength signals and acoustic emission signal present sinusoidal curve relation relative to the deflection relation of fiber laser sensor.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. optical fiber acoustic emission detection and a positioning system, is characterized in that, this system comprises:
The fiber laser sensor strain rosette (8) be in series by multiple fiber laser sensor (5);
Encapsulation is fixed the plurality of fiber laser sensor (5) and is transmitted the fiber laser sensor strain rosette base plate (4) of acoustic emission signal;
Be coupled the plurality of fiber laser sensor (5) transmit the acoustic couplant (7) of acoustic emission signal;
The fiber-optic signal demodulating equipment (2) of the optical signalling that the reception fiber laser sensor (5) that also demodulation is caused by acoustic emission signal produces; And
Based on fiber-optic signal demodulating equipment (2), the result that optical signalling demodulates is realized to the acoustic emission source locating device (1) of acoustic emission source location;
Wherein, described acoustic emission source locating device (1) can realize according to the direction characteristic of fiber laser sensor acoustic emission signal locating or according to the acoustic emission source location that time difference method positions, adopting continuous acoustic emission signal location algorithm or burst acoustic emission signal location algorithm to realize the detecting and locating of continuous type or demblee form two kinds of acoustic emission signals;
When described acoustic emission source locating device (1) adopts continuous acoustic emission signal location algorithm, locate relative to the deflection relational implementation of fiber laser sensor (5) according to fiber laser sensor (5) wave length shift amplitude and acoustic emission signal;
When described acoustic emission source locating device (1) adopts burst acoustic emission signal location algorithm, wavelet energy number percent and the acoustic emission signal of the different frequency composition of one side foundation fiber laser sensor (5) wavelength signals are located relative to the deflection relational implementation of fiber laser sensor (5), and the mistiming that another aspect arrives different fiber laser sensor strain rosettes (8) according to acoustic emission signal realizes location.
2. optical fiber acoustic emission detection according to claim 1 and positioning system, it is characterized in that, described fiber laser sensor (5) is DBR type (DBR) fiber laser sensor or distribution bragg feedback-type (DFB) fiber laser sensor, can experience acoustic emission signal and this acoustic emission signal be changed into the change of its output wavelength.
3. optical fiber acoustic emission detection according to claim 2 and positioning system, it is characterized in that, described fiber laser sensor (5) has three at least, and these at least three fiber laser sensors (5) in same plane, be not parallel to each other, fiber laser sensor strain rosette (8) in series.
4. optical fiber acoustic emission detection according to claim 3 and positioning system, is characterized in that, described fiber laser sensor (5) is three, and these three fiber laser sensors (5) form equilateral triangle or isosceles right triangle.
5. optical fiber acoustic emission detection according to claim 1 and positioning system, is characterized in that, described fiber laser sensor strain rosette base plate (4) and acoustic couplant (7) are and can carry out the material of acoustic matching with matrix.
6. optical fiber acoustic emission detection according to claim 1 and positioning system, it is characterized in that, described fiber laser sensor strain rosette base plate (4) is bonded in the surface of matrix by colloid, or by described fiber laser sensor strain rosette base plate (4) and on fiber laser sensor strain rosette (8) and acoustic couplant (7) be coupled to the inside of matrix together, to realize acoustic emission signal detection neatly and acoustic emission source is located.
7. optical fiber acoustic emission detection according to claim 1 and positioning system, is characterized in that, described fiber-optic signal demodulating equipment (2) is a kind of high-precision fiber laser sensor demodulating equipment.
8. optical fiber acoustic emission detection according to claim 7 and positioning system, it is characterized in that, described fiber-optic signal demodulating equipment (2) is the fiber laser sensor demodulating equipment based on principle of interference and phase carrier (PGC) algorithm, and its dynamic strain resolution can reach 10
-6pm.
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