CN105841794A - Optimized coupled optical fiber sensor-based flat plate ultrasound source positioning method and system - Google Patents
Optimized coupled optical fiber sensor-based flat plate ultrasound source positioning method and system Download PDFInfo
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- CN105841794A CN105841794A CN201610317010.7A CN201610317010A CN105841794A CN 105841794 A CN105841794 A CN 105841794A CN 201610317010 A CN201610317010 A CN 201610317010A CN 105841794 A CN105841794 A CN 105841794A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0237—Thin materials, e.g. paper, membranes, thin films
Abstract
The invention provides an optimized coupled optical fiber sensor-based flat plate ultrasound source positioning method and system. The system comprises a laser light source, a coupled optical fiber sensor, two photoelectric detectors, a differential amplification circuit and a data collection system, wherein one input end of the coupled optical fiber sensor is connected with the laser light source, two output ends are respectively connected with a first photoelectric detector and a second photoelectric detector, and output ends of the two photoelectric detectors are orderly connected with the differential amplification circuit and the data collection system; the coupled optical fiber sensor comprises an optical fiber acoustic emission sensor, a packaging V-shaped groove and packaging UV adhesive; the coupled optical fiber sensor is formed by subjecting two single mode optical fibers to overcoupling operation, two ends of the single mode optical fibers are packaged in the V-shaped groove via the UV adhesive, and a UV adhesive packaging cut-off part is a sensor coupling region start part. Via use of the method, arrival time and propagation velocity of two frequency components of an A0 mode are extracted, calculated distance of an ultrasound source can be calculated via a flat plate ultrasound signal, and therefore single sensor linear positioning can be realized.
Description
Technical field
The present invention relates to acoustic emission on-line monitoring field, be specially based on the coupled mode Fibre Optical Sensor optimized
Flat board supersonic source localization method and system.
Background technology
In engineering industry field, sheet metal is a kind of most commonly seen engineering part, and it is long-term
Inevitably affected by overload, environment, the factor such as artificial during military service, crackle etc. is occurred
Damage, causes security incident or unnecessary economic loss.In order to prevent this type of accident to occur, need
Damage position detected timely and effectively, the health status of this type of sheet material is carried out on-line monitoring.
Ultrasound wave is propagated in flat board in the way of Lamb wave, and its composition is mainly A0With S0Two
Plant most basic mode, usual S0Mode energy is little, and frequency dispersion effect is inconspicuous, it is difficult to identify；And
A0Mode energy is relatively big, and frequency dispersion effect is obvious, easy to identify, therefore A0Mode is commonly used for reacting sound source
Information.
Accurately judgement on time of arrival (toa) is the key factor affecting positioning precision.Generally people are more
Spend first the signal wave crest moment setting threshold value as time of arrival (toa), abbreviation threshold method；Or will
First crest moment of whole signal, as time of arrival (toa), is called for short Peak Intensity Method.Y.Ding et al.
" the A new method for waveform analysis for delivered on NDT&E International
Estimating AE wave arrival times using wavelet decomposition " utilize Peak Intensity Method pair
Ultrasonic signal is positioned, and positioning result occurs in that relatively large deviation；J.Jiao et al. in
Deliver on STRUCTURAL CONTROL AND HEALTH MONITORING
“Acoustic emission source location methods using mode and frequency
Analysis " also with Peak Intensity Method, A0 mode difference component is judged the time of advent, the party is legal
The relative error of position is 8%-14%, and position error is bigger.It practice, ultrasound wave in flat board with Lamb
Waveshape is propagated, and it comprises the component of different modalities, and along with the increase of propagation distance occurs that pattern turns
The phenomenon such as change.So, the peak value of ultrasonic signal may be by shadows such as ultrasonic reflections superposition, patten transformation
Ring and produce skew, it is impossible to accurate characterization ultrasound wave time of advent, ultimately result in deviations.And with this
Method carries out linear orientation, it usually needs at least two sensor could realize, and adds cost.
Traditional piezoelectric ceramics class sonac owing to its volume is big, easily by electromagnetic interference, install and survey
The factors such as amount is inconvenient make it be difficult to apply in small space and strong electromagnetic environment, and optical fiber passes by contrast
Sensor use all-fiber measure, the little light weight of volume, be prone to landfill, not by electromagnetic interference be more suitable for application
On-line monitoring in remote workpiece device duty.
The optical fibre ultrasonic sensor having pointed out is mainly interferometric optical fiber sensor, such as (1) Prague light
Grid, (2) Fabry-Perot cavity, (3) mach-zehnder are interfered, (4) Sagnac is interfered, this
A little interferometric optical fiber sensors are relatively costly, and higher and sensor the processing technology of the requirement to equipment is multiple
Miscellaneous, be not suitable for the engineer applied of reality.Such as disclosed patent CN201010185466.5 " Fiber Optic Sensor cloth
In-Perot pressure sensor and preparation method thereof " " point contact type optical fiber surpasses with CN201310061027.7
Sonic sensor " belong to the above-mentioned type sensor.
Summary of the invention
For problems of the prior art, the present invention provides a kind of and passes based on the coupled mode optical fiber optimized
Sensor flat board supersonic source localization method and system, improve localization by ultrasonic accuracy, decrease sensor
Use, reduce cost, and for realizing all-fiber of flat board supersonic source, remote tuning on-line has established base
Plinth.
The present invention is to be achieved through the following technical solutions:
Based on the coupled mode Fibre Optical Sensor flat board supersonic source alignment system optimized, including LASER Light Source, coupling
Mould assembly Fibre Optical Sensor, two photodetectors, differential amplifier circuit and data collecting system；Coupled mode
One input of Fibre Optical Sensor connects LASER Light Source, and two outfans connect the first photodetection respectively
Device and the second photodetector, the outfan of two photodetectors is sequentially connected with differential amplifier circuit sum
According to acquisition system；
Described coupled mode Fibre Optical Sensor includes Optical Fibre Acoustic Emission Sensor, packaging V type groove and encapsulation
UV glue；Coupled mode Fibre Optical Sensor is formed by two single-mode fiber overcoupling, coupled mode Fibre Optical Sensor
Two ends are encapsulated in V-groove by UV glue respectively；It is that sensor coupled zone is risen at the encapsulation cut-off of UV glue
At beginning.
Preferably, described LASER Light Source is C-band narrow linewidth light source, and live width is less than 2MHz.
Preferably, the detection wave-length coverage of described first photodetector and the second photodetector comprises light
Source wavelength, responsive bandwidth is more than 10MHz.
Preferably, described flat board supersonic source is 20kHz-250kHz in the frequency of A0 mode.
Based on the coupled mode Fibre Optical Sensor flat board supersonic source localization method optimized, use such as above-mentioned technical side
System described in any one in case, comprises the following steps:
S1: obtained the ultrasonic signal of flat panel workpieces to be measured by coupled mode Fibre Optical Sensor, carry out Gabor
Conversion, obtains the time-frequency figure of signal；
S2: identify A from time-frequency figure0Mode, and from A0In mode, preferably two calculate frequency component
f1、f2；
S3: utilize threshold method to judge f1、f2The t time of advent of componentA01、tA02；
S4: obtain and treat master plate dispersion curve, searches group velocity v of respective frequencies componentA01、vA02；
S5: according to d=(tA01-tA02)/(1/vA01-1/vA02) it is calculated supersonic source distance.
Preferably, described flat panel workpieces to be measured is isotropic material, and the parameter of isotropic material includes
Thickness, shear wave speed and compressional wave speed.
Preferably, in S1, the temporal resolution of described Gabor transformation is set to 1 μ s, frequency resolution
It is set to 1kHz.
Preferably, in S2, two calculate frequency and preferably choose at the continuous place of frequency dispersion, choose interval
At least above 20kHz, selection range is at 20kHz-250kHz.
Preferably, in S3, described threshold method be using the 1%-3% of ceiling capacity in signal time-frequency figure as
Threshold value, draws its isogram, calculates corresponding to first intersection point of frequency component and this isogram
Moment is the time of advent of this frequency component.
Compared with prior art, the present invention has a following useful technique effect:
The present invention utilizes in flat board Lamb wave that A0 mode energy is big, propagation distance is remote, frequency dispersion is obvious
Feature, extracts the time of advent and the spread speed of two frequency components of A0 mode, can be surpassed by a flat board
Acoustical signal is calculated the computed range of supersonic source, it is achieved the linear orientation of single sensor, and method is simple
Reliably, the complexity of alignment system is decreased.
Relative to traditional piezoelectric transducer, native system uses the coupled mode Fibre Optical Sensor optimized, both
Effectively react the Dispersion of signal A0 mode to be detected, ensure again high sensitivity, particularly suitable
In the localization method that the present invention proposes.And make simple, it is easy to accomplish, the most effectively, success rate
Height, demodulating system low cost, electromagnetism interference, corrosion-resistant, do not affected by temperature drift etc., be more suitable for
Location in complex environment middle plateform component defect.Coupled mode Fibre Optical Sensor therein belongs to intensity modulation
Type, it is relative to phase modulation-type and interferometric optical fiber sensor, less demanding to equipment such as light sources,
And coupled mode Fibre Optical Sensor processing technology is ripe, easily realize based on its system built, be more suitable for application
The on-line monitoring of equipment in Practical Project.
Utilize localization method provided by the present invention, can realize accurately and effectively based on single sensor plate
The linear orientation of sound source；System electromagnetism interference, corrosion-resistant, and device is simple, low cost, it is easy to real
Existing, Distributed localization remote for complex environment middle plateform supersonic source and long-continued mensuration are established
Basis.Utilize threshold method that the time of advent of A0 mode different frequency component is judged simultaneously, it is possible to
Avoid ultrasonic reflections superposition, the patten transformation etc. that may be subject to affect, improve positioning precision, the present invention
The middle location relative error utilizing threshold method can reach 0.2%-2.48%.
Accompanying drawing explanation
Fig. 1 is the flat board supersonic source localization method flow chart of the present invention.
Fig. 2 is coupled mode fibre-optic sensor package top view prepared by the present invention.
Fig. 3 a is that the sensor equivalent diameter corresponding to Fibre Optical Sensor difference package position of the present invention shows
It is intended to.
Fig. 3 b is that in Fig. 3 a, package position is to survey the time frequency analysis figure of ultrasonic signal in b point place.
Fig. 3 c is that in Fig. 3 a, package position is to survey the time frequency analysis figure of ultrasonic signal in c point place.
Fig. 3 d is that in Fig. 3 a, package position is to survey the time frequency analysis figure of ultrasonic signal in d point place.
Fig. 3 e is that in Fig. 3 a, package position is to survey the time frequency analysis figure of ultrasonic signal in e point place.
Fig. 4 be the thickness of slab described in present example be the dispersion curve of the aluminium sheet (5052) of 2mm.
Fig. 5 is the Fibre Optical Sensor alignment system schematic diagram of the present invention.
Fig. 6 a is that simulated sound spacing described in present example excites when Fibre Optical Sensor 45cm, passes
Sensor surveyed ultrasonic signal time domain beamformer.
Fig. 6 b is the time frequency analysis figure of Fig. 6 a correspondence ultrasonic signal.
Fig. 7 is threshold value isogram corresponding for Fig. 6 b.
In figure, 1 for LASER Light Source, 2 for coupled mode Fibre Optical Sensor, 3 be the first photodetector, 4
Be the second photodetector, 5 for differential amplifier circuit, 6 for data collecting system, 7 for simulation ultrasonic
Source, 8 be flat board member to be measured, 21 for Optical Fibre Acoustic Emission Sensor, 22 is sensor equivalent diameter,
23 is packaging V type groove, and 24 is encapsulation UV glue.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, described in be to the present invention
Explanation rather than restriction.
The present invention is based on the coupled mode Fibre Optical Sensor flat board supersonic source localization method optimized, wherein said
Supersonic source is 20kHz-250kHz；As it is shown in figure 1, its to specifically include step as follows: (1) is by excellent
The coupled mode Fibre Optical Sensor 2 changed obtains flat board ultrasonic signal, carries out Gabor transformation, obtains signal
Time-frequency figure；(2) from time-frequency figure, A is identified0Mode, and from A0In mode, preferably two calculating frequencies are divided
Amount f1、f2；(3) threshold method is utilized to judge f1、f2The t time of advent of componentA01、tA02；(4) obtain
Treat master plate dispersion curve, search group velocity v of respective frequencies componentA01、vA02；(5) basis
D=(tA01-tA02)/(1/vA01-1/vA02) it is calculated supersonic source distance.
Wherein, the coupled mode Fibre Optical Sensor 2 of optimization is as in figure 2 it is shown, Optical Fibre Acoustic Emission Sensor 21
It is encapsulated in V-groove 23, with encapsulation UV glue 24 i.e. ultraviolet curing glue to Optical Fibre Acoustic Emission Sensor
21 carry out symmetric packages, and remaining overhanging portion is sensing unit, and b, c, d, e 4 expression is different
Package position, 22 represent the equivalent diameter of corresponding package position lower sensor；
As it is shown on figure 3, under same sensor difference package position, obtain same sound source measurement is super
Acoustical signal time-frequency figure, b, c, d, e 4 is corresponding with Fig. 2；The package position that b, c are 2 does not arrives
Reaching the coupled zone of sensor, sensor two-arm is in released state, not yet merges, such as Fig. 3 b and Fig. 3 c
Shown in, it is the signal time-frequency figure that 2 package position of b, c measure, and frequency dispersion effect is bad；D point
Package position exactly sensor two-arm starts at fusion, and namely UV glue 24 encapsulates at cut-off as passing
Sensor coupled zone section start, two-arm starts to merge, and as shown in Figure 3 d, it measures for d point package position
Signal time-frequency figure, frequency dispersion is effective, is also the claimed system point of the present invention；The encapsulation position of e point
Put and cross sensor coupled zone section start, packaging area covering part coupled zone, as shown in Figure 3 e, its
The signal time-frequency figure measured for e point package position, although frequency dispersion is effective, but signal to noise ratio is decreased obviously,
Reduce the sensor power of test to Weak Ultrasonic signal, affect positioning result；Consider, in order to
Ensure that sensor effectively measures the frequency dispersion effect of flat board ultrasonic signal, have higher signal to noise ratio simultaneously, encapsulation
Position should start at fusion just in sensor two-arm, i.e. position at d.
According to flat board parameter, obtain plate curve；The present embodiment is selected 5052 type aluminium sheets as to be measured
The parameters such as parts, its thickness of slab, shear wave speed and compressional wave are fast are listed in table 1.
Table 1 5052 type aluminium sheet flat board parameter.
Table 1 middle plateform parameter is substituted in Rayleigh-Lamb equation, solving equation obtain frequency f with
The dispersion curve of the relation of spread speed v, i.e. this flat board, and it is stored in data base, Rayleigh-Lamb
Equation is as follows:
Wherein:
The theoretical L amb dispersion curve of flat board member to be measured is obtained after solving, as shown in Figure 4, horizontal in figure
Axle represents frequency (kHz), and the longitudinal axis represents group velocity (m/s), and solid black lines is A0Mode, Lycoperdon polymorphum Vitt is empty
Line is S0Mode.
Fig. 5 is the detecting system schematic diagram of present example, and coupled mode Fibre Optical Sensor 2 is solid with UV glue
Due to the surface of flat board member 8 to be measured, LASER Light Source 1 sends the light of 1550nm wavelength, through single-mode optics
Fine transmission is to coupled mode Fibre Optical Sensor 2, and light is divided into two, and exports to the first light through single-mode fiber respectively
Electric explorer 3 and the second photodetector 4, after optical signal is converted to the signal of telecommunication, then send through BNC line
To differential amplifier circuit 5, carrying out differential amplification process, the signal of telecommunication after process is by data collecting system 6
Gather.In the present embodiment, supersonic source 7 uses the mode of international fracture pencil-lead (2H, 0.7)
Simulation (Hsu-Nielsen source), the most identical in order to ensure each excitation signal, lead for retractable pencil ruptures
Direction and angle keep consistent, 45 ° of simulations of employing in this preferred embodiment, LASER Light Source 1 is adopted
Use DFB LASER Light Source.
The ultrasonic signal simulation flat-panel defect that simulation supersonic source produces, propagates with Lamb wave form, coupling
Type Fibre Optical Sensor 2 detects ultrasonic signal generation microstrain, changes the coupling efficiency of sensor, makes
There is corresponding change in the light output of two-arm, ultimately results in the signal of telecommunication detected and change, formed ultrasonic
Signal waveform.In the present embodiment, ultrasonic simulation source 7 range sensor 45cm, the ultrasonic letter detected
Number time-domain diagram is as shown in Figure 6 a.
Having obtained time-domain ultrasonic signal, needed it is carried out time frequency analysis, the present embodiment uses
Gabor transformation in MATLAB time-frequency workbox, processes time-domain signal, its time resolution
Rate is set to 1 μ s, and frequency resolution is set to 1kHz.Obtain the time frequency distribution map of measured signal, as
Shown in Fig. 6 b, horizontal axis plots time (μ s) in figure, the longitudinal axis represents frequency (MHz), shade generation
Table energy size；The time of advent that can be seen that ultrasonic signal different frequency component from Fig. 6 b is different
, it shows obvious dispersion phenomenon, according to A0Mode high fdrequency component spread speed is fast, low frequency division
The feature that amount spread speed is slow, can identify A0Mode, in Fig. 6 b, white dashed line represents matching
A0Mode.
Choose calculating frequency f1、f2, by Fig. 6 b it can be seen that A0Mode has even at 40kHz-150kHz
Continuous dispersion phenomenon, in order to reduce error as far as possible, frequency component is chosen and should be tried one's best greatly, and frequency component
Difference, at least above 20kHz, chooses f in the present embodiment1=80kHz, f2=120kHz is as calculating frequency
Rate.
Calculating frequency f is determined with threshold method1、f2The time of advent, turn to reduce Lamb wave pattern
Change, reflect the impact of superposition, set threshold value and should be defined to the 1%-3% of peak signal energy, in this reality
Execute and example takes 2%.Fig. 7 is threshold value isogram corresponding in Fig. 6 b, a, b 2 the most corresponding two
The intersection point of individual calculating frequency and contour, the coordinate of 2 be respectively a (532.1 μ s, 120kHz),
B (558.1 μ s, 80kHz).Therefore, the time of advent of 120kHz is tA02=532.1 μ s, 80kHz component
The time of advent be tA01=558.1 μ s.
The dispersion curve of flat board member to be measured, f in query graph 41The A that=80kHz component is corresponding0Mode group
Speed is vA01=2121.9km/s, f1The A0 mode group velocity that=120kHz component is corresponding is
vA02=2424.1km/s.
Supersonic source distance can be calculated by following formula
Corresponding parameter being brought into formula and can be calculated the distance of supersonic source is 44.26cm, with actual value
45cm differs only by 0.74cm, it was demonstrated that this method is the most effective, also demonstrates optical fiber coupling acoustic emission
It is feasible that sensor is applied to flat board ultrasonic locating.
Table 2 lists simulation supersonic source distance to be changed from 5cm to 80cm, and every 5cm is a step-length,
Positioning the positioning result of 16 points altogether, location is carried out twice altogether, and twice time interval differs 7 days to test
The stability of card coupled mode Fibre Optical Sensor location.Location relative error is less than 3% for the first time, and second
Secondary location relative error is less than 5%, it was demonstrated that the flat board supersonic source localization method of the present invention and alignment system
It is the most effective.
Table 2 flat board supersonic source positioning result.
* represent and be separated by seven days positioning time for the first time
In sum, the light that in the present invention, LASER Light Source sends enters coupled mode Fibre Optical Sensor, and light is passing
Being divided into two in sensor, export respectively to photodetector one and photodetector two, optical signal is converted to
Sending into modulate circuit after the signal of telecommunication and carry out differential amplification process, the signal of telecommunication after process is by computer acquisition also
Being filtered denoising, the localization method that the signal obtained finally utilizes the present invention propose calculates,
To sound source distance.Flat board supersonic source localization method and alignment system that the present invention provides have the most accurately
Property and stability.Although the present invention discloses as above with preferred embodiment, so it is not limited to this
Bright, present invention primarily contemplates one-dimensional case, but described positioning principle can be generalized to two dimension and three-dimensional
Location situation.
Claims (9)
1. based on the coupled mode Fibre Optical Sensor flat board supersonic source alignment system optimized, it is characterised in that bag
Include LASER Light Source (1), coupled mode Fibre Optical Sensor (2), two photodetectors, differential amplifier circuit
And data collecting system (6) (5)；One input of coupled mode Fibre Optical Sensor (2) connects laser
Light source (1), two outfans connect the first photodetector (3) and the second photodetector respectively
(4), the outfan of two photodetectors is sequentially connected with differential amplifier circuit (5) and data acquisition system
System (6)；
Described coupled mode Fibre Optical Sensor (2) includes Optical Fibre Acoustic Emission Sensor (21), packaging V
Type groove (23) and encapsulation UV glue (24)；Coupled mode Fibre Optical Sensor (21) is by two single-mode fibers
Overcoupling is formed, and coupled mode Fibre Optical Sensor (21) two ends are encapsulated in V by UV glue (24) respectively
In type groove (23)；It is sensor coupled zone section start at UV glue (24) encapsulation cut-off.
The most according to claim 1 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
System, it is characterised in that described LASER Light Source is C-band narrow linewidth light source, live width is less than 2MHz.
The most according to claim 1 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
System, it is characterised in that described first photodetector (3) and the spy of the second photodetector (4)
Surveying wave-length coverage and comprise optical source wavelength, responsive bandwidth is more than 10MHz.
The most according to claim 1 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
System, it is characterised in that described flat board supersonic source is 20kHz-in the frequency of A0 mode
250kHz。
5. based on the coupled mode Fibre Optical Sensor flat board supersonic source localization method optimized, it is characterised in that adopt
By the system as described in any one in claim 1-4, comprise the following steps:
S1: obtained the ultrasonic signal of flat panel workpieces to be measured by coupled mode Fibre Optical Sensor (2), carry out
Gabor transformation, obtains the time-frequency figure of signal；
S2: identify A from time-frequency figure0Mode, and from A0In mode, preferably two calculate frequency component
f1、f2；
S3: utilize threshold method to judge f1、f2The t time of advent of componentA01、tA02；
S4: obtain and treat master plate dispersion curve, searches group velocity v of respective frequencies componentA01、vA02；
S5: according to d=(tA01-tA02)/(1/vA01-1/vA02) it is calculated supersonic source distance.
The most according to claim 5 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
Method, it is characterised in that described flat panel workpieces to be measured is isotropic material, the ginseng of isotropic material
Number includes thickness, shear wave speed and compressional wave speed.
The most according to claim 5 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
Method, in S1, the temporal resolution of described Gabor transformation is set to 1 μ s, and frequency resolution is set to
1kHz。
The most according to claim 5 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
Method, in S2, two calculate frequency and preferably choose at the continuous place of frequency dispersion, choose interval the biggest
In 20kHz, selection range is at 20kHz-250kHz.
The most according to claim 5 based on the coupled mode Fibre Optical Sensor flat board supersonic source location optimized
Method, in S3, described threshold method is as threshold value using the 1%-3% of ceiling capacity in signal time-frequency figure,
Draw its isogram, calculate the moment corresponding to first intersection point of frequency component and this isogram i.e.
The time of advent for this frequency component.
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| CN111141829A (en) * | 2019-12-28 | 2020-05-12 | 西安交通大学 | Plane positioning method based on micro-nano coupling optical fiber sensor |
| CN111141830A (en) * | 2019-12-28 | 2020-05-12 | 西安交通大学 | Micro-nano coupling optical fiber sensor-based linear positioning system and method |
| CN111141830B (en) * | 2019-12-28 | 2021-04-20 | 西安交通大学 | Micro-nano coupling optical fiber sensor-based linear positioning system and method |
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