CN103308146B - The signal demodulating system of Optic Fibre F-P Acoustic Emission Sensor - Google Patents
The signal demodulating system of Optic Fibre F-P Acoustic Emission Sensor Download PDFInfo
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- CN103308146B CN103308146B CN201310182641.9A CN201310182641A CN103308146B CN 103308146 B CN103308146 B CN 103308146B CN 201310182641 A CN201310182641 A CN 201310182641A CN 103308146 B CN103308146 B CN 103308146B
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Abstract
A kind of signal demodulating system of Optic Fibre F-P Acoustic Emission Sensor.Comprise optics self calibration laser light source module, optical circulator, Optic Fibre F-P Acoustic Emission Sensor, feeble signal photoelectric conversion module, feeble signal conditioning module, high-speed signal acquisition module and signal processing module; Optical circulator has three ports, and the 1st port connects optics self calibration laser light source module; 2nd port is connected to Optic Fibre F-P Acoustic Emission Sensor; The signal reflected by Optic Fibre F-P Acoustic Emission Sensor is connected to feeble signal photoelectric conversion module through the 3rd port; Feeble signal photoelectric conversion module, feeble signal conditioning module, high-speed signal acquisition module and signal processing module order is connected, the process of signal processing module settling signal and analysis.This signal demodulating system solves fibre-optical F-P sensor and to work online continuously the problem of light source self calibration in process, Weak Signal Processing, improves measuring accuracy, simplifies system preparation technology, reduce cost.
Description
Technical field
The present invention relates to optical fiber Fabry-Perot(F-P) calibrate AE sensor line monitor signal demodulation techniques, belong to technical field of optical fiber sensing.
Background technology
At present, the calibrate AE sensor used in various field comprises the multiple sensors such as electrical sensor, Fibre Optical Sensor, traditional calibrate AE sensor many employings resonant mode piezoelectric sensor, its major defect is: volume is large, response frequency is low, can not use under the rugged surroundings such as high temperature, strong electromagnetic and corrosion.By contrast, Fibre Optical Sensor has that volume is little, response frequency is high, measuring accuracy is high, electromagnetism interference, is easy to the advantages such as networking.Therefore, optical fiber Fabry-Perot(F-P) sensor acoustic emission signal detect in there is very important value.Up to the present, the demodulation that fiber F-P acoustic emission is used is mainly intensity demodulation.
The output signal of Optic Fibre F-P Acoustic Emission Sensor is nonlinear sinusoidal signal, and intensity type fiber F-P sensor-based system realizes the measurement to straining by the corresponding relation between sensor output intensity and sensor cavity length.Although in most of the cases may detect the change of sinusoidal transfer function, in the position of peak value or valley, can not determine that chamber length increases or reduces, because no matter chamber length increases or reduces, the light intensity of output signal is all reduction.Output side signal is fuzzy to there will be, and must use special technology to determine the direction of change.In fact light source output intensity can be subject to the impact of the external environments such as temperature, and this just causes negative impact to the accuracy of measurement of system, reduces stability and the measuring accuracy of system works.At present, main adopt double F-P chambers orthogonal measuring method and dual wavelength and three wavelength measurement methods, these method system make difficult and signal demodulating system is complicated, frequency, demodulation frequency is low, are very limited in actual applications.For this problem, the people such as University of Virginia Wang An ripple propose the self-compensation type intensity demodulation method based on wideband light source in " Self-calibrated interferometric/intensity-based optical fiber sensors " paper.Although this demodulating system easily realizes and can overcome said system affecting responsive shortcoming to external world, but the signal of this demodulating system is very faint, survey frequency and precision are all lower, can not meet the requirement of Optic Fibre F-P Acoustic Emission Sensor signal receiving in practical application.
Summary of the invention
The object of the invention is intended to overcome the deficiency existed in above-mentioned calibrate AE sensor intensity demodulation technology, a kind of optical fiber Fabry-Perot(F-P is provided) signal demodulating system of calibrate AE sensor, solve Optic Fibre F-P Acoustic Emission Sensor to work online continuously the problem of light source self calibration in process, Weak Signal Processing software and hardware, improve the measuring accuracy of system, simplify the preparation technology of sensor-based system, reduce the cost of sensor.
To achieve the above object, the technical scheme provided is as follows in the present invention:
A signal demodulating system for Optic Fibre F-P Acoustic Emission Sensor, this system comprises optics self calibration laser light source module, optical circulator, Optic Fibre F-P Acoustic Emission Sensor, feeble signal photoelectric conversion module, feeble signal conditioning module, high-speed signal acquisition module and signal processing module; Optical circulator has three ports, the optics self calibration laser light source module described in the 1st port connection of optical circulator; 2nd port of optical circulator is connected to Optic Fibre F-P Acoustic Emission Sensor; The signal reflected by Optic Fibre F-P Acoustic Emission Sensor is connected to feeble signal photoelectric conversion module through the 3rd port of optical circulator; Feeble signal photoelectric conversion module is connected to feeble signal conditioning module; Feeble signal conditioning module is connected to high-speed signal acquisition module; High-speed signal acquisition model calling to signal processing module, the process of signal processing module settling signal and analysis.
In technical scheme of the present invention, optics self calibration laser light source module selects model to be Santec TUNABLE SEMICONDUCTOR LASER TSL-510 LASER Light Source.Beam intensity ratio in this module adjusts the operating voltage of fiber F-P adjustable filter automatically compared with feedback query circuit, makes the output power all-the-time stable of optics self calibration laser light source module in the intermediate value of minimum output power and peak power output.
In technical scheme of the present invention, feeble signal photoelectric conversion module selects model to be the OP111A operational amplifier of low noise sound pitch to-noise ratio, and this module is carried out filtered signal noise obtain real transducing signal by being arranged corresponding optical band pass filter before avalanche diode.
In technical scheme of the present invention, feeble signal conditioning module selects model to be LFC2 high gain operational amplifier and Chebyshev's filtering circuit composition.By in the amplification of the multilevel of modulate circuit and the alternately filtering of software and hardware in this module, improve signal intensity and the signal to noise ratio (S/N ratio) of system.
In technical scheme of the present invention, described high-speed signal acquisition module, adopts model to be that AD7810 modulus conversion chip and NI-USB-6366 data collecting card carry out high speed acquisition to conditioned signal.
In technical scheme of the present invention, signal processing module adopts high speed fpga chip to process signal, adopt the method for multivariate wavelet transform to carry out denoising, and combine with Fast Fourier Transform (FFT) real-time analysis and process are carried out to data, and display on computers.
In technical scheme of the present invention, described optical circulator has three ports, wherein three ports are connected to described optics self calibration laser light source module, described Optic Fibre F-P Acoustic Emission Sensor and described feeble signal photoelectric conversion module respectively, object is the signal reflected by described Optic Fibre F-P Acoustic Emission Sensor, be transferred to described feeble signal photoelectric conversion module through described optical circulator, thus light signal is transmitted according to the path low-loss of specifying.
Described optics self calibration laser light source module is connected to described optical circulator, for whole system provides light source.Wherein, beam intensity ratio comparatively feedback query circuit is comprised in described optics self calibration laser light source module, fiber F-P adjustable filter driving circuit and fiber F-P adjustable filter etc., automatically adjusted the operating voltage of fiber F-P adjustable filter compared with the automatic calibration function of feedback query circuit by the beam intensity ratio in described optics self calibration laser light source module, make the output power all-the-time stable of described optics self calibration laser light source module in the intermediate value of minimum output power and peak power output, thus improve the measuring accuracy of system, simplify the preparation technology of sensor-based system, reduce the cost of sensor, described feeble signal photoelectric conversion module by arranging corresponding optical band pass filter filtered signal noise before avalanche diode, thus obtains real transducing signal.
Described feeble signal photoelectric conversion module is connected to feeble signal conditioning module, and wherein, the amplification of feeble signal conditioning module by the multilevel of modulate circuit and the alternately filtering of software and hardware, improve signal intensity and the signal to noise ratio (S/N ratio) of system.
Described feeble signal conditioning module is connected to high-speed signal acquisition module.Wherein, adopt the A/D converter of high sampling rate, high speed fpga chip carries out high speed acquisition to conditioned signal;
By described high-speed signal acquisition model calling to described signal processing module.Wherein, in signal processing module, adopt the method for multivariate wavelet transform to carry out denoising, and combine with Fast Fourier Transform (FFT) real-time analysis and process are carried out to data, and be shown on computing machine.
Based on above-mentioned technical scheme, the present invention has the following advantages:
1. the present invention adjusts the operating voltage of fiber F-P adjustable filter automatically compared with the automatic calibration function of feedback query circuit by the beam intensity ratio in optics self calibration laser light source module, make the output power all-the-time stable of described optics self calibration laser light source module in the intermediate value of minimum output power and peak power output, thus improve the measuring accuracy of system, simplify the preparation technology of sensor-based system, reduce the cost of sensor.
2. feeble signal conditioning module of the present invention improves signal intensity and the signal to noise ratio (S/N ratio) of system by the amplification of the multilevel of modulate circuit and the alternately filtering of software and hardware.
3. signal processing module of the present invention adopts the method for multivariate wavelet transform to carry out denoising, and combines with Fast Fourier Transform (FFT) and carry out real-time analysis and process to data, and is shown on computing machine.
Accompanying drawing explanation
Fig. 1 is the anatomical connectivity schematic diagram of the signal demodulating system of Optic Fibre F-P Acoustic Emission Sensor of the present invention.
Embodiment
As shown in Figure 1, optical fiber Fabry-Perot(F-P of the present invention) signal demodulating system of calibrate AE sensor mainly comprises: optics self calibration laser light source module 1, optical circulator 2, Optic Fibre F-P Acoustic Emission Sensor 3, feeble signal photoelectric conversion module 4, feeble signal conditioning module 5, high-speed signal acquisition module 6, signal processing module 7.Wherein, optical circulator 2 has three ports, is respectively the 1st port 8, the 2nd port 9 and the 3rd port one 0.First Optic Fibre F-P Acoustic Emission Sensor 3 is fixed on the required position measured, optics self calibration LASER Light Source 1 is connected to the 1st port 8 of optical circulator 2; 2nd port 9 of optical circulator 2 is connected to Optic Fibre F-P Acoustic Emission Sensor 3; The signal reflected by Optic Fibre F-P Acoustic Emission Sensor 3 is connected to feeble signal photoelectric conversion module 4 through the 3rd port one 0 of optical circulator 2; Feeble signal photoelectric conversion module 4 is connected to feeble signal conditioning module 5; Feeble signal conditioning module 5 is connected to high-speed signal acquisition module 6; High-speed signal acquisition module 6 is connected to signal processing module 7, and signal processing module 7 carrys out process and the analysis of settling signal by corresponding application software.
After the light that optics self calibration laser light source module 1 exports enters the 1st port 8 of optical circulator 2, Optic Fibre F-P Acoustic Emission Sensor 3 is exported to from the 2nd port 9 of optical circulator 2, when Optic Fibre F-P Acoustic Emission Sensor 3 senses the acoustic emission signal produced in sensing range, the acoustic emission signal of acquisition is reflected the 2nd port 9 entering optical circulator 2 by Optic Fibre F-P Acoustic Emission Sensor 3, export from the 3rd port one 0 of optical circulator 2, the acoustic emission signal that 3rd port one 0 of optical circulator 2 exports is transferred to feeble signal photoelectric conversion module 4, feeble signal photoelectric conversion module 4 obtains real transducing signal by other optical signalling noises of bandpass filter filtering of avalanche diode front end, then carry out opto-electronic conversion process and faint acoustic emission signal is converted to more weak electric signal, when faint electric signal is sent to feeble signal conditioning module 5, feeble signal conditioning module 5 is nursed one's health signal by the amplification of multilevel and the alternately filtering of software and hardware, signal through feeble signal conditioning module 5 is sent to high-speed signal acquisition module 6, high-speed signal acquisition module 6 comprises acp chip A/D converter and FPGA, the last entering signal processing module 7 of the signal collected, signal processing module 7 adopts the method for multivariate wavelet transform to carry out denoising, and combine with Fast Fourier Transform (FFT) real-time analysis and process are carried out to data, and be shown on computing machine.
Claims (6)
1. a signal demodulating system for Optic Fibre F-P Acoustic Emission Sensor, is characterized in that: this system comprises optics self calibration laser light source module (1), optical circulator (2), fiber F-P calibrate AE sensor (3), feeble signal photoelectric conversion module (4), feeble signal conditioning module (5), high-speed signal acquisition module (6) and signal processing module (7); Optical circulator (2) has three ports, the optics self calibration laser light source module described in the 1st port (8) connection of optical circulator (2); 2nd port (9) of optical circulator (2) is connected to fiber F-P calibrate AE sensor (3); The signal reflected by fiber F-P calibrate AE sensor (3) is connected to feeble signal photoelectric conversion module (4) through the 3rd port (10) of optical circulator (2); Feeble signal photoelectric conversion module (4) is connected to feeble signal conditioning module (5); Feeble signal conditioning module (5) is connected to high-speed signal acquisition module (6); High-speed signal acquisition module (6) is connected to signal processing module (7), the process of signal processing module (7) settling signal and analysis; Beam intensity ratio comparatively feedback query circuit, fiber F-P adjustable filter driving circuit and fiber F-P adjustable filter is comprised in described optics self calibration laser light source module, automatically adjusted the operating voltage of fiber F-P adjustable filter by the beam intensity ratio in described optics self calibration laser light source module compared with the automatic calibration function of feedback query circuit, make the output power all-the-time stable of described optics self calibration laser light source module in the intermediate value of minimum output power and peak power output; after the light that optics self calibration laser light source module (1) exports enters the 1st port (8) of optical circulator (2), Optic Fibre F-P Acoustic Emission Sensor (3) is exported to from the 2nd port (9) of optical circulator (2), when Optic Fibre F-P Acoustic Emission Sensor (3) senses the acoustic emission signal produced in sensing range, the acoustic emission signal of acquisition is reflected the 2nd port (9) entering optical circulator (2) by Optic Fibre F-P Acoustic Emission Sensor (3), export from the 3rd port (10) of optical circulator (2), the acoustic emission signal that 3rd port (10) of optical circulator (2) exports is transferred to feeble signal photoelectric conversion module (4), feeble signal photoelectric conversion module (4) obtains real transducing signal by other optical signalling noises of bandpass filter filtering of avalanche diode front end, then carry out opto-electronic conversion process and faint acoustic emission signal is converted to more weak electric signal, when faint electric signal is sent to feeble signal conditioning module (5), feeble signal conditioning module (5) is nursed one's health signal by the amplification of multilevel and the alternately filtering of software and hardware, signal through feeble signal conditioning module (5) is sent to high-speed signal acquisition module (6), high-speed signal acquisition module (6) comprises acp chip A/D converter and FPGA, the last entering signal processing module (7) of the signal collected, signal processing module (7) adopts the method for multivariate wavelet transform to carry out denoising, and combine with Fast Fourier Transform (FFT) real-time analysis and process are carried out to data, and be shown on computing machine.
2. the signal demodulating system of a kind of Optic Fibre F-P Acoustic Emission Sensor as claimed in claim 1, is characterized in that: optics self calibration laser light source module (1), selects model to be Santec TUNABLE SEMICONDUCTOR LASER TSL-510 LASER Light Source.
3. the signal demodulating system of a kind of Optic Fibre F-P Acoustic Emission Sensor as claimed in claim 1, is characterized in that: feeble signal photoelectric conversion module (4), selects model to be the OP111A operational amplifier of low noise sound pitch to-noise ratio.
4. the signal demodulating system of a kind of fiber F-P calibrate AE sensor as claimed in claim 1, is characterized in that: feeble signal conditioning module (5) is LFC2 high gain operational amplifier and Chebyshev's filtering circuit composition.
5. the signal demodulating system of a kind of fiber F-P calibrate AE sensor as claimed in claim 1, it is characterized in that: described high-speed signal acquisition module (6), adopt model to be that AD7810 modulus conversion chip and NI-USB-6366 data collecting card carry out high speed acquisition to conditioned signal.
6. the signal demodulating system of a kind of Optic Fibre F-P Acoustic Emission Sensor as claimed in claim 1, is characterized in that: described signal processing module (7), adopts high speed fpga chip to process signal.
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| CN104467966B (en) * | 2014-12-31 | 2017-10-24 | 中国人民解放军信息工程大学 | A kind of LED modulator approaches and system based on visible light communication |
| KR101772160B1 (en) * | 2016-02-15 | 2017-08-29 | 조선대학교산학협력단 | Multivariate wavelet transform-based battery discrimination method and apparatus |
| CN106017522B (en) * | 2016-05-11 | 2018-09-14 | 武汉理工大学 | A kind of quick high accuracy signal demodulating method of fibre-optical F-P sensor |
| CN105973282B (en) * | 2016-05-20 | 2018-10-09 | 武汉理工大学 | The long Wavelet Phase of fibre-optical F-P sensor chamber extracts demodulation method |
| CN106441654A (en) * | 2016-09-12 | 2017-02-22 | 电子科技大学 | Micro broadband fiber micro pressure sensing device |
| CN106338352A (en) * | 2016-09-19 | 2017-01-18 | 电子科技大学 | Optical fiber pressure sensor of inaction contact angle measurement error |
| CN106672887B (en) * | 2016-12-29 | 2018-05-01 | 武汉理工大学 | A kind of vibration acceleration sensing device based on carborundum fiber F-P resonator |
| CN106959269B (en) * | 2017-03-29 | 2020-07-31 | 天津大学 | Simplified chip bonding strength measuring device and method |
| CN107561160B (en) * | 2017-08-31 | 2020-04-07 | 西北大学 | High signal-to-noise ratio optical fiber ultrasonic sensor based on polytetrafluoroethylene film |
| CN109088670B (en) * | 2018-08-10 | 2019-12-24 | 华中科技大学 | Method and system for determining sound wave signal |
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