CN104180834B - A kind of fiber laser sensor system for bifrequency sonic detection - Google Patents
A kind of fiber laser sensor system for bifrequency sonic detection Download PDFInfo
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- CN104180834B CN104180834B CN201410366571.7A CN201410366571A CN104180834B CN 104180834 B CN104180834 B CN 104180834B CN 201410366571 A CN201410366571 A CN 201410366571A CN 104180834 B CN104180834 B CN 104180834B
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Abstract
nullThe present invention relates to a kind of fiber laser sensor system for bifrequency sonic detection，Including optical fiber DBR grating，Rotary part，980/1550 wavelength division multiplexer，Pump laser，Optoisolator，Polarization Controller，The polarizer and photoelectric detector，Wherein，The 980nm laser of pumping enters optical fiber DBR grating through 980/1550 wavelength division multiplexer after pump laser penetrates，Rotary part is for keeping the rotation of optical fiber DBR grating，From the extraneous double frequency acoustic wave action of different directions on rotating optical fiber DBR grating，The grating rotated is at a certain angle sonic sensitive to a frequency，At another angle sonic sensitive to another frequency，The modulates information of double frequency sound wave is in the light wave of transmission，Optical wavelength is converted into 1550nm，And it is reflected back 980/1550 wavelength division multiplexer；Light wave is through preventing the optoisolator of optical echo from entering in Polarization Controller, then makes two polarization states become same direction through the polarizer to be converted into the signal of telecommunication.The present invention can detect the sound wave of two different frequencies simultaneously.
Description
Art
The present invention relates to a kind of optical-fiber laser acoustic wave sensing system, be specifically related to use Fibre Optical Sensor that bifrequency sound wave is detected simultaneously.
Background technology
The fiber laser sensor being applied to sonic detection at present mainly carries out sensing detection to single sound source, and patent " optical fibre sound pressure sensor " is (public
The number of opening CN101660939A) mention based on beat frequency detection optical fibre sound pressure sensor be only capable of the sound source of single-frequency is sensed, multifrequency sound source
Crossmodulation and the frequency multiplication of sound source itself between sound source, the result of impact detection can be produced during sensing.In oceanic sounding field, often use height
Double frequency sound wave detects, and high frequency sound wave can be with the detected with high accuracy depth of water, and low-frequency sound wave can detect sea-floor relief on a large scale, and double frequency sound wave improves
The accuracy of detection.In submarine detection field, ocean, the sound wave of different frequency represents submarine or naval vessel different device, needs to use induction frequencies
Sensor at different frequency range works simultaneously and can be only achieved the target of complete detection, so also result in the bulky of sensor array.
Summary of the invention
It is contemplated that propose the double Acoustic wave sensing devices of a kind of novel optical fiber laser, utilize sensor from different directions different frequency acoustic sensitivity not
Same characteristic, uses the mode of rotation sensing parts, detects the sound wave of two different frequencies simultaneously.The present invention utilizes polarization heterodyne fiber grating DBR
(distributed Blatt reflective) laser sensor senses, and has highly sensitive, the advantage that space availability ratio is high, and, the present invention utilizes rotation
Parts keep the rotation of fiber grating, and in its rotation process, utilization orientation accurately detects the different frequency sound wave of both direction, can eliminate simultaneously
The multiple harmonic of demodulation output end signal.Technical scheme is as follows:
A kind of fiber laser sensor system for bifrequency sonic detection, including optical fiber DBR grating, rotary part, 980/1550 wavelength division multiplexer,
Pump laser, optoisolator, Polarization Controller, the polarizer and photoelectric detector, it is characterised in that the 980nm laser of pumping is from pumping laser
After device injection in 980/1550 wavelength division multiplexer enters optical fiber DBR grating, rotary part is used for keeping the rotation of optical fiber DBR grating, from
The extraneous double frequency acoustic wave action of different directions is on rotating optical fiber DBR grating, and the grating of rotation is at a certain angle sound wave to a frequency
Sensitivity, in another angle sonic sensitive to another frequency, the modulates information of double frequency sound wave to the light wave of transmission, optical wavelength is converted into
1550nm, and it is reflected back 980/1550 wavelength division multiplexer；Light wave, through preventing the optoisolator of optical echo from entering in Polarization Controller, utilizes partially
The controller that shakes adjusts the polarization state direction of light wave and prevents polarization state Energy distribution uneven, and the light wave being adjusted makes two polarization states become by the polarizer
After same direction, entering in photoelectric detector, to complete the optical signal conversion to the signal of telecommunication, two polarization states are carried out in electricity frequency domain simultaneously
Beat frequency.
The invention has the beneficial effects as follows: first, sensing element DBR grating sensitivity is the highest, can detect the sound wave that intensity is the lowest；Secondly, DBR
Grating is different to the double frequency acoustic sensitivity from different directions, and when grating is in certain angle, grating is to a certain frequency sound on some direction
Ripple is sensitive, and insensitive to another frequency sound waves on another direction, and this characteristic makes the grating can be to difference in the case of keeping rotating
The sound wave of frequency detects effectively, avoids double frequency sound wave simultaneously and crossmodulation occurs in demodulated equipment thus generation and frequency or difference frequency, also
Avoid the frequency multiplication that sound wave self is likely to occur, it is therefore prevented that unnecessary signal disturbing testing result.
Accompanying drawing explanation
Accompanying drawing 1: double frequency acoustic wave sensing system block diagram；
Accompanying drawing 2: double frequency sound wave sensing output spectrum figure.
Detailed description of the invention
The present invention will be further described for example below in conjunction with the accompanying drawings.
As it is shown in figure 1, the optical-fiber laser alliteration wave sensor mentioned in the present invention is single longitudinal mode based on optical fiber DBR grating laser polarizes outer beat
Video sensor.The 980nm laser of pumping through 980/1550 wavelength division multiplexer enters DBR grating, uses one after pump laser penetrates
Rotary part keeps the rotation of grating, and from the extraneous double frequency acoustic wave action of different directions on sensing element grating, the grating of rotation is at a certain angle
The degree sonic sensitive to a frequency, at another angle sonic sensitive to another frequency, the modulates information of double frequency sound wave has arrived the light wave of transmission
In, optical wavelength is converted into 1550nm, and is reflected back WDM.Light wave, through preventing the isolator of optical echo from entering in Polarization Controller, utilizes polarization
Controller controls the polarization state direction of light wave and prevents polarization state Energy distribution uneven.The light wave adjusted makes two polarization states become same by the polarizer
Direction, so could complete beat frequency in demodulated equipment.Light wave enters finally in photoelectric detector, completes the optical signal conversion to the signal of telecommunication, with
Time two polarization states in electricity frequency domain, carry out beat frequency, in electricity spectrum analyzer, detect the signal of telecommunication obtained during demodulation, therefrom can obtain double frequency
The information of sound wave.Accompanying drawing 2 has been the spectrogram that obtains after demodulation, and double frequency sound wave is respectively 7MHz and 14MHz, main ripple from the spectrogram of output
The frequency size of the acoustic signals of the two frequency can be obtained with the frequency difference of harmonic wave, complete the target of sensing.
Claims (1)
1. for a fiber laser sensor system for double frequency sonic detection, including optical fiber DBR grating, rotary part, 980/1550 wavelength-division multiplex
Device, pump laser, optoisolator, Polarization Controller, the polarizer and photoelectric detector, wherein, the 980nm laser of pumping is from pump
After the laser instrument injection of Pu in 980/1550 wavelength division multiplexer enters optical fiber DBR grating, rotary part is used for keeping optical fiber DBR grating
Rotation, from the extraneous double frequency acoustic wave action of different directions on rotating optical fiber DBR grating, the optical fiber DBR light of rotation
Grid are at a certain angle sonic sensitive to a frequency, in another angle sonic sensitive to another frequency, the information of double frequency sound wave
Having modulated in the light wave of transmission, optical wavelength is converted into 1550nm, and is reflected back 980/1550 wavelength division multiplexer；Light wave is through anti-
During only the optoisolator of optical echo enters Polarization Controller, utilize Polarization Controller to adjust the polarization state direction of light wave, prevent polarization state energy
Amount skewness, after the light wave being adjusted makes two polarization states become same direction by the polarizer, enters in photoelectric detector,
To complete the optical signal conversion to the signal of telecommunication, two polarization states carry out beat frequency in electricity frequency domain simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410366571.7A CN104180834B (en) | 2014-07-29 | 2014-07-29 | A kind of fiber laser sensor system for bifrequency sonic detection |
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| CN201410366571.7A CN104180834B (en) | 2014-07-29 | 2014-07-29 | A kind of fiber laser sensor system for bifrequency sonic detection |
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| CN104180834A CN104180834A (en) | 2014-12-03 |
| CN104180834B true CN104180834B (en) | 2016-08-24 |
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| CN201476770U (en) * | 2009-08-13 | 2010-05-19 | 南昌航空大学 | Double-frequency grating projection three-dimensional outline measuring device based on rotary split joint |
| CN102322880A (en) * | 2011-08-18 | 2012-01-18 | 天津大学 | Polarization sensitive distributive optical frequency domain reflection disturbance sensor and demodulation method |
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| FR2929000B1 (en) * | 2008-03-18 | 2010-04-09 | Thales Sa | SELF-REFERENCE OPTICAL FIBER SENSOR AND ASSOCIATED SENSOR ARRAY |
| US9490418B2 (en) * | 2011-03-29 | 2016-11-08 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Acoustic resonator comprising collar and acoustic reflector with temperature compensating layer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236075A (en) * | 2008-02-29 | 2008-08-06 | 南开大学 | Bending radius measuring apparatus based on optical fibre laser |
| CN201476770U (en) * | 2009-08-13 | 2010-05-19 | 南昌航空大学 | Double-frequency grating projection three-dimensional outline measuring device based on rotary split joint |
| CN102322880A (en) * | 2011-08-18 | 2012-01-18 | 天津大学 | Polarization sensitive distributive optical frequency domain reflection disturbance sensor and demodulation method |
| CN103644961A (en) * | 2013-12-04 | 2014-03-19 | 华中科技大学 | Sound-pressure measurement sensor and multi-longitudinal-mode fiber-laser sound-pressure measurement system |
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| 单频分布布拉格反射光纤激光器及温度传感实验研究;黄文财等;《中国激光》;20030831;第30卷(第08期);第695-697页 * |
| 基于铒镱共掺分布布拉格反射式光纤激光器的有源光纤水听器声压灵敏度;马丽娜等;《中国激光》;20090630;第36卷(第06期);第1473-1478页 * |
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