CN102944613A - 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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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 the acoustic emission testing technology field, relate in particular to a kind of optical fiber acoustic emission detection and positioning system of superhigh precision.
Background technology
Acoustic emission (Acoustic Emission, AE) be called again the stress wave emission, be that the local source releases energy fast and produces a kind of phenomenon of Elastic wave in the material, and majority is weak vibration or the surface displacement that can only just can detect with high sensor.The observation of acoustic emission phenomenon originates from seismic monitoring, be widely used in now in the middle of the industry-by-industries such as Acoustic emission of acoustic emission detection, monitoring structural health conditions and compound substance of rock burst monitoring, pressure vessel and Aero-Space parts, and brought into 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 adopts the resonant mode piezoelectric sensor more, and 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) that the people such as a kind of calibrate AE sensor (Chinese patent application CN201074528Y) that the people such as the small sized wide-band sound-emission sensor (Chinese patent application CN1051087A) that proposes such as people such as Zhang Ke, Liu Sheng propose, Ben Yu propose etc.
From the end of the eighties in last century, be accompanied by developing rapidly of optical fiber sensing technology, 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 a volume, bandwidth, and damaging thresholding is high, needn't contact maybe with testee and can be embedded in structured material inside, is applicable to the advantages such as rugged surroundings such as high temperature, strong electromagnetic, corrosion.The dissimilar Optical Fibre Acoustic Emission Sensor such as intensity modulation type, phase modulation-type (interfere type), wavelength-modulated type is developed by success, and is 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 in the successful Application of industry-by-industry, acoustic emission detection scheme based on the FBG sensor obtains extensive concern (IgnacioPerez et., " Acoustic Emission Detection U sing F iber Bragg Gratings ", SMARTMATERIALS AND STRUCTURES, 2001).
Interference Optical Fiber Acoustic Emission Sensor with respect to the broad research in early stage, the FBG sensor has less volume and quality, and adopt Wavelength-encoding not to be subjected to the light source power influence of fluctuations, be easy to networking, consist of large tracts of land delamination damage monitoring system, specifically FBG also has the acoustic emission detection direction characteristic, can make up the FBG strain rosette and realize the location of acoustic emission source (G THURABY et., " Multifunctional fibre optic sensors monitoring strain and ultrasound ", Fatigue﹠amp; Fracture of Engineering Materials﹠amp; Structures, 2008), this also makes it become the study hotspot in the optical fiber acoustic emission detection over past ten years.For example, the fiber grating strain flower (U.S. patent of invention US6586722) that provides of the people such as a kind of acoustic emission signal sensor-based system based on Fiber Bragg Grating FBG (Chinese invention patent CN102313779A) of providing of the fiber grating acoustic emission that provides of Guan Baiou and the people such as temperature sensor (Chinese invention patent CN1818625A), Wei Peng, Kenny etc.But yet there are no the report that utilizes the FBG strain rosette to realize simultaneously continuous type and two kinds of acoustic emission signal detecting and locatings of demblee form.
In recent years, fiber laser sensor (FLs) has demonstrated huge potentiality at sensory field of optic fibre, it except have simple, the anti-electromagnetic interference (EMI) of common FBG sensor construction, size is little and be easy to set up by wavelength-division multiplex the advantage such as sensing network, also have simultaneously the advantages such as single-frequency, narrow linewidth, high power, ultra-low noise, can realize supersensitive Dynamic Signal detection in conjunction with the high resolution wavelength demodulation techniques, this has incomparable advantage aspect signal detection.Therefore FLs is used for acoustic emission detection, not only can obtain to have higher detection sensitivity (C-C Ye.et than FBG type calibrate AE sensor, " Ultrasonic sensing using Yb3+/Er3+-codoped distributedfeedback fibre grating lasers ", SMART MATERIAL S AND S TRUCTURE S, 2005), simultaneously since the optical-fiber laser calibrate AE sensor with respect to the interference Optical Fiber Acoustic Emission Sensor of broad research, its physical dimension is little, be easy to networking, this has very large technical advantage aspect acoustic emission detection and the location.But up to the present, the research of the acoustic emission direction characteristic of FLs be yet there are no relevant report.
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 two kinds of acoustic emission signals of demblee form, utilize the direction characteristic of fiber laser to realize two kinds of different acoustic emission source location algorithms, carry out simultaneously detection and the location of continuous type and burst acoustic emission signal, and emphasis solve faint acoustic emission signal detect in the sensitivity of calibrate AE sensor not high, the location is complicated, electromagnetic interference (EMI), high temperature resistant, high pressure, strong corrosive environment ability, and the problems such as long range signals real-time Transmission and long-term Continuous Observation.
Summary of the invention
The technical matters that (one) will solve
In view of this, fundamental purpose of the present invention provides a kind of optical fiber acoustic emission detection and positioning system of superhigh precision, to improve the ability of surveying faint acoustic emission signal and acoustic emission source being positioned, and the sensitivity that solves calibrate AE sensor in the faint acoustic emission signal detection is not high, the 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 that is in series by a plurality of fiber laser sensors 5; Encapsulation is fixed these a plurality of fiber laser sensors 5 and is transmitted the fiber laser sensor strain rosette base plate 4 of acoustic emission signal; This a plurality of fiber laser sensors 5 and transmit the acoustic couplant 7 of acoustic emission signal are coupled; The fiber-optic signal demodulating equipment 2 of the optical signalling that the fiber laser sensor 5 that reception and demodulation are caused by acoustic emission signal produces; And the acoustic emission source locating device 1 of realizing the acoustic emission source location based on the result that 2 pairs of optical signallings of fiber-optic signal demodulating equipment demodulate.
In the such scheme, described fiber laser sensor 5 is distributed Blatt reflective type (DBR) fiber laser sensor or distribution bragg feedback-type (DFB) fiber laser sensor, can experience the variation that acoustic emission signal also changes this acoustic emission signal into its output wavelength.
In the 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, series connection consists of fiber laser sensor strain rosette 8.
In the such scheme, described fiber laser sensor 5 is three, and these three fiber laser sensors 5 consist of equilateral triangle or isosceles right triangle.
In the such scheme, described fiber laser sensor strain rosette base plate 4 and acoustic couplant 7 are the material that can carry out with matrix acoustic matching.
In the such scheme, described fiber laser sensor strain rosette base plate 4 is bonded in the surface of matrix by colloid, perhaps with described fiber laser sensor strain rosette base plate 4 and on fiber laser sensor strain rosette 8 and acoustic couplant 7 inside of being coupled to together matrix, to realize that neatly acoustic emission signal is surveyed and acoustic emission source is located.
In the 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, its dynamic strain resolution 10
-6Pm.
In the such scheme, described acoustic emission source locating device 1 can be realized 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 two kinds of acoustic emission signals of demblee form.When described acoustic emission source locating device 1 adopts the continuous acoustic emission signal location algorithm, locate with respect to the deflection relational implementation of fiber laser sensor 5 according to fiber laser sensor 5 wave length shift amplitudes and acoustic emission signal; When described acoustic emission source locating device 1 adopts the burst acoustic emission signal location algorithm, one side is located with respect to the deflection relational implementation of fiber laser sensor 5 according to wavelet energy number percent and the acoustic emission signal of the different frequency composition of fiber laser sensor 5 wavelength signals, realizes the location according to the mistiming of the different fiber laser sensor strain rosette 8 of acoustic emission signal arrival on the other hand.
(3) beneficial effect
Can find out from technique scheme, the present invention has following beneficial effect:
1, optical fiber acoustic emission detection provided by the invention and positioning system adopt high sensitivity and wide band fiber laser sensor, can improve the ability of surveying faint acoustic emission signal.
2, optical fiber acoustic emission detection provided by the invention and positioning system, by the fiber laser series connection is consisted of the fiber laser strain rosette, and for continuous type and burst acoustic emission signal, utilize the direction characteristic of fiber laser to realize two kinds of different acoustic emission source location algorithms, carry out simultaneously detection and the location of continuous type and burst acoustic emission signal, can greatly reduce the complexity of acoustic emission source location.
3, optical fiber acoustic emission detection provided by the invention and positioning system, adopt fiber laser to substitute traditional electricity acoustic emission probe, a kind of full photo measure method, therefore can solve a little less than the anti-electromagnetic interference performance in the acoustic emission detection problem such as high temperature resistant, high pressure, strong corrosive environment ability.
4, optical fiber acoustic emission detection provided by the invention and positioning system adopt optical cable to carry out the signal transmission, and light signal is insensitive to electrical signal, are easy to realize long range signals real-time Transmission and long-term Continuous Observation.
Description of drawings
Fig. 1 is the schematic diagram of acoustic emission detection and the positioning system based on the fiber laser sensor strain rosette provided by the invention;
Fig. 2 is the acoustic emission detection based on fiber laser sensor strain rosette array provided by the invention and the schematic diagram of positioning system;
Fig. 3 is the schematic diagram of the continuous acoustic emission signal that records of 3 fiber laser sensors in the single fiber laser sensor strain rosette provided by the invention;
Fig. 4 is the schematic diagram of the burst acoustic emission signal that records of 3 fiber laser sensors in the single fiber laser sensor strain rosette provided by the invention;
Fig. 5 is that fiber laser sensor wave length shift amplitude provided by the invention and acoustic emission signal are with respect to the deflection relation curve of fiber laser sensor;
Fig. 6 is that the wavelet energy number percent of different frequency composition of fiber laser sensor wavelength signals provided by the invention and acoustic emission signal are with respect to the deflection relation curve of fiber laser sensor.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, 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 the schematic diagram of acoustic emission detection and the positioning system based on the fiber laser sensor strain rosette provided by the invention, and Fig. 2 is the acoustic emission detection based on fiber laser sensor strain rosette array provided by the invention 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: by the fiber laser sensor strain rosette 8 that a plurality of fiber laser sensors 5 are in series, its tail optical fiber is drawn by optical cable 6, and fiber laser sensor 5 is for detection of acoustic emission signal; Encapsulation is fixed these a plurality of fiber laser sensors 5 and is transmitted the fiber laser sensor strain rosette base plate 4 of acoustic emission signal; This a plurality of fiber laser sensors 5 and transmit the acoustic couplant 7 of acoustic emission signal are coupled; The fiber-optic signal demodulating equipment 2 of the optical signalling that the fiber laser sensor 5 that reception and demodulation are caused by acoustic emission signal produces; And the acoustic emission source locating device 1 of realizing the acoustic emission source location based on the result that 2 pairs of optical signallings of fiber-optic signal demodulating equipment demodulate.
Wherein, fiber laser sensor 5 is distributed Blatt reflective type (DBR) fiber laser sensor or distribution bragg feedback-type (DFB) fiber laser sensor, can experience the variation that acoustic emission signal also changes this acoustic emission signal into its output wavelength.Optical-fiber laser type sensor is taken into account traditional passive optical fiber grating sensor and the advantage of interference type optical fiber sensor, has advantages 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, series connection consists of fiber laser sensor strain rosette 8.When fiber laser sensor 5 was three, this three fiber laser sensors 5 consisted of equilateral triangles, isosceles right triangle or every 120 ° of Y-shaped structures that lay 3 fiber laser sensors etc.
In the present invention, fiber laser sensor strain rosette base plate 4 and acoustic couplant 7 are the material that can carry out with matrix acoustic matching.For example, if matrix is marble, base plate also can be marble, grouan etc. so, 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, perhaps with described fiber laser sensor strain rosette base plate 4 and on fiber laser sensor strain rosette 8 and acoustic couplant 7 inside of being coupled to together matrix, to realize that neatly acoustic emission signal is surveyed 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, its dynamic strain resolution 10
-6Pm.
In the present invention, acoustic emission source locating device 1 can be realized 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 two kinds of acoustic emission signals of demblee form.The direction characteristic of fiber laser sensor acoustic emission signal verifies by experiment, can similarly test with reference to the relevant report of existing direction characteristic about fiber grating (FBG) sensor acoustic emission signal.
When described acoustic emission source locating device 1 adopts the continuous acoustic emission signal location algorithm, locate with respect to the deflection relational implementation of fiber laser sensor 5 according to fiber laser sensor 5 wave length shift amplitudes and acoustic emission signal; When described acoustic emission source locating device 1 adopts the burst acoustic emission signal location algorithm, one side is located with respect to the deflection relational implementation of fiber laser sensor 5 according to wavelet energy number percent and the acoustic emission signal of the different frequency composition of fiber laser sensor 5 wavelength signals, realizes the location according to the mistiming of the different fiber laser sensor strain rosette 8 of acoustic emission signal arrival on the other hand.When utilizing time difference method to carry out the acoustic emission source location, the installation process of branched fiber laser sensor 5 guarantees to have identical axial direction as far as possible.
In the present invention, can also on the fiber laser sensor strain rosette base plate 4 by fiber laser sensor 5 of sound insulating material encapsulation (type of this fiber laser sensor is consistent with the type of 3 fiber laser sensors on being installed in fiber laser sensor strain rosette base plate), perhaps design a kind of isolated chambers this fiber laser sensor 5 is carried out the sound isolation, be used for the temperature compensation of fiber laser sensor strain rosette 8.
As shown in Figure 2, in order to determine more accurately the position of acoustic emission source, can be on matrix installing optical fibres laser sensor strain rosette 4 arrays, different fiber laser sensor strain rosettes 4 connects by optical cable (such as armored optical cable), carry out the acoustic emission source location by fiber-optic signal demodulating equipment 2 harmony emission source positioning devices 1, can greatly improve like this precision of acoustic emission source location.
The principle of work of optical fiber acoustic emission detection provided by the invention and positioning system is as follows: when the inner generation of matrix material defective, acoustic emission wave (AE ripple) within it section spreads, when the AE ripple arrives voice sending sensor zone (being fiber laser sensor strain rosette 8), to cause the faint disturbance (surface displacement) in this zone, 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 can realize detection to acoustic emission signal by fiber-optic signal demodulating equipment 2 again.In addition, acoustic emission direction characteristic according to fiber laser sensor 5, use a fiber laser sensor strain rosette 8 that is made up by 3 and 5 series connection of the above not fiber laser sensor in same plane, the location that can realize acoustic emission source by acoustic emission source locating device 1.
In order further to improve the precision of acoustic emission source location, can be on matrix material installing optical fibres laser sensor strain rosette 8 arrays, to reduce using single optical fiber laser sensor strain rosette 8 to carry out the error of acoustic emission source location.
Please refer to Fig. 3, survey the ability of continuous acoustic emission signal in order to verify the fiber laser strain rosette, the present invention is installed on it and carries out the acoustic emission detection experiment on block of marble plate, 3 fiber laser sensors 5 can finding out fiber laser sensor strain rosette 8 can both clearly be recorded to sinusoidal signal, and have 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 it equally and carries out the acoustic emission detection experiment on the block of marble plate, 3 fiber laser sensors 5 can finding out fiber laser sensor strain rosette 8 can both clearly be recorded to impact signal, and have lower noise level.
Please refer to Fig. 5, in order to verify fiber laser sensor wave length shift amplitude and acoustic emission signal with respect to the deflection relation of fiber laser sensor, the present invention tests the direction characteristic that single fiber laser sensor is surveyed the sinusoidal wave acoustic emission signal of continuous type.In the experimentation, single fiber laser sensor 5 is installed in certain angle direction (this position is installed a piezo-electric type acoustic emission probe simultaneously) on the matrix material, then the acoustic emission signal transmitting probe is installed respectively on the circumference of distance fiber laser sensor 5 same distance, the frequency and the amplitude that transmit by the signal generator guide sound remain unchanged, the signal of measuring diverse location place acoustic emission on the circumference 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 shape curved line relation with respect to the deflection relation of fiber laser sensor.
Please refer to Fig. 6, for the wavelet energy number percent of the different frequency composition of verifying the fiber laser sensor wavelength signals and the acoustic emission signal deflection relation with respect to fiber laser sensor, the present invention is to testing the direction characteristic of single fiber laser sensor probe burst type impact signal.Similarly, in experimentation, single fiber laser sensor 5 is installed in certain angle direction (this position is installed a piezo-electric type acoustic emission probe simultaneously) on the matrix material, then the diverse location place on distance fiber laser sensor 5 same distance circumference, respectively at identical At The Height with steel ball free falling bodies, the simulation impact signal, and then the impact signal at diverse location place causes the wavelet energy number percent of wave length shift value under a certain frequency of fiber laser on the measurement circumference, 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 the sinusoidal curve relation with respect to the deflection relation of fiber laser sensor.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an optical fiber acoustic emission detection and positioning system is characterized in that, this system comprises:
The fiber laser sensor strain rosette (8) that is in series by a plurality of fiber laser sensors (5);
Encapsulation is fixed these a plurality of fiber laser sensors (5) and is transmitted the fiber laser sensor strain rosette base plate (4) of acoustic emission signal;
This a plurality of fiber laser sensors (5) and transmit the acoustic couplant (7) of acoustic emission signal are coupled;
The fiber-optic signal demodulating equipment (2) of the optical signalling that the fiber laser sensor (5) that reception and demodulation are caused by acoustic emission signal produces; And
The result who optical signalling is demodulated based on fiber-optic signal demodulating equipment (2) realizes the acoustic emission source locating device (1) of acoustic emission source 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 distributed Blatt reflective type (DBR) fiber laser sensor or distribution bragg feedback-type (DFB) fiber laser sensor, can experience the variation that acoustic emission signal also changes this acoustic emission signal into 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, series connection consists of fiber laser sensor strain rosette (8).
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) consist of 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 the material that can carry out with matrix acoustic matching.
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, perhaps with described fiber laser sensor strain rosette base plate (4) and on fiber laser sensor strain rosette (8) and acoustic couplant (7) inside of being coupled to together matrix, to realize that neatly acoustic emission signal is surveyed 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, its dynamic strain resolution 10-
6Pm.
9. optical fiber acoustic emission detection according to claim 1 and positioning system, it is characterized in that, described acoustic emission source locating device (1) can be realized 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 two kinds of acoustic emission signals of demblee form.
10. optical fiber acoustic emission detection according to claim 9 and positioning system,
When described acoustic emission source locating device (1) adopts the continuous acoustic emission signal location algorithm, locate with respect 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 the burst acoustic emission signal location algorithm, one side is located with respect to the deflection relational implementation of fiber laser sensor (5) according to wavelet energy number percent and the acoustic emission signal of the different frequency composition of fiber laser sensor (5) wavelength signals, realizes the location according to the mistiming of the different fiber laser sensor strain rosette (8) of acoustic emission signal arrival on the other hand.
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