CN101893455A - Optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof - Google Patents
Optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof Download PDFInfo
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- CN101893455A CN101893455A CN 201010222131 CN201010222131A CN101893455A CN 101893455 A CN101893455 A CN 101893455A CN 201010222131 CN201010222131 CN 201010222131 CN 201010222131 A CN201010222131 A CN 201010222131A CN 101893455 A CN101893455 A CN 101893455A
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Abstract
The invention relates to the optical fiber sensor field, in particular to an optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof. The invention comprises a 980nm pumping light source connected with one terminal of a wavelength division multiplexer, the common terminal of the wavelength division multiplexer is connected with one terminal of a composite chamber optical fiber laser to form a composite chamber laser entire part, the other terminal of the composite chamber optical fiber laser is connected with a single mode optical fiber, the terminal of the single mode optical fiber is wound on a silicon rubber cylinder to form a sensing probe, a third terminal of the wavelength division multiplexer is connected with one terminal of an isolator, the other terminal of the isolator is connected with a photo detector controlled by a computer. The diameter of silicon rubber cylinder ranges from 3cm to 6cm. The sensing detector adopts feedback effect method to demodulate. The invention has the advantages to simple and feasible demodulating method, simple manufacturing, low price, flexible structure and easy control.
Description
Technical field
The present invention relates to the Fibre Optical Sensor field, be specially a kind of optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof.
Background technology
Distributed feed-back formula/distributed Blatt reflective formula (DFB/DBR) fiber laser sensor receives much attention owing to it has advantages such as high-performance and volume be little, is widely used in vibration, temperature, sound sensor.The demodulation method of these sensors mainly passes through Zhang Zhiguo, Zhang Min, Ye Pei is greater than deliver the spectroanalysis instrument that " based on the long-distance optical fiber Bragg grating sensing of line style chamber Raman fiber lasers " proposes in August, 2006 on " Chinese laser " the 8th phase, Liu Renzhu, Zhen Sheng comes, Cao Zhigang, Yu originally stands on analysis phase carrier (PGC) method that 2007 " the doped fiber ring laser type vibrative sensors " delivered propose or passes through Lan Yuwen in the 13 optical fiber communication in the whole nation and the 14 integrated optics academic conference, Liu Bo, the beat frequency of the observation laser instrument that Luo Jianhua sets forth in " based on the pressure transducer of distributed Blatt reflective fiber laser " that deliver at " optics journal " in March, 2009 is realized.
DFB/DBR fiber laser sensor has two kinds of sensing principles, a kind of is that fiber laser is only as narrow-band light source, one arm of interferometer is a sensing head, and this sensor is owing to function admirable, long service life are widely used, but demodulation method such as PGC method more complicated; Another kind be laser instrument itself directly as sensing head, with the PGC or the method demodulation of measuring beat frequency, and that this method relies on the encapsulation of sensing head is higher, present encapsulation technology can't reach requirement.Patent " based on the Ultrashort cavity optical fiber acceleration transducer " (China Patent No.: CN101261281A, open day 2008/09/10) discloses a kind of optical fiber acceleration transducer based on ultra-short cavity optical fibre laser.This sensor is bonded at the semi-girder surface with laser instrument, and the change by semi-girder stress changes the grating bragg reflection wavelength of fiber laser, and its demodulation cost costliness is unfavorable for large-scale production and application.
Summary of the invention
The present invention seeks to propose a kind ofly to be used to vibrate, the detection optical fiber composite chamber laser feedback effect sensor of sensing such as sound, pressure.The present invention also aims to propose a kind of demodulation method of optical fiber composite chamber laser feedback effect sensor special use.
The object of the present invention is achieved like this:
The pump light source of 980nm connects an end of wavelength division multiplexer, one end of the common port of wavelength division multiplexer and Compound Cavity fiber laser is connected to form the composite chamber laser integral part, Compound Cavity fiber laser other end order mode fiber, the single-mode fiber end is wrapped on the silicon rubber cylinder and constitutes sensing probe, wavelength division multiplexer the 3rd end connects an end of isolator, and the isolator other end connects by computer-controlled photodetector.Silicon rubber column diameter scope is 3cm-6cm.
Sensing probe adopts the method for feedback effect to carry out demodulation, and concrete steps are as follows:
(1) signal acts on sensing probe, and the light that feeds back in the single-mode fiber is along with signal changes.
(2) signal acquiring system is gathered time-domain signal.
(3) time-domain signal is carried out Fast Fourier Transform (FFT), be converted to frequency-region signal.
(4) the frequency value of frequency-region signal and intensity are carried out demodulation with the frequency value of measured signal and the changing of fluctuation of intensity.
Beneficial effect of the present invention is: the present invention realizes demodulation with the weak retroactive effect of photoelastic effect, and demodulation method is simple; Sensing probe is made of single-mode fiber and silica gel cylinder, makes simple, cheap; Sensing probe is connected by length-adjustable single-mode fiber with probe portion with laser instrument can be placed apart according to actual needs, more easy to control.
Description of drawings
Fig. 1 is a systematic schematic diagram of the present invention;
Fig. 2 is a Compound Cavity fiber laser enlarged drawing;
Fig. 3 is the system experimentation time-domain diagram;
Fig. 4 is the system experimentation frequency domain figure.
Embodiment
Below the present invention will be further described:
The 980nm pump light of 980nm pump light source 3 outputs enters the 980nm end of wavelength division multiplexer WDM4, the common port of WDM links to each other with Compound Cavity fiber laser CCFL5, CCFL encapsulated prevent the influence of outer signals whole sensor-based system, the single-mode fiber of the CCFL other end and actual needs length welds together, the single-mode fiber tail end is wrapped on the silica gel cylinder as sensing head 8, the size of silica gel cylinder is with extraneous strain variation, diameter is got the value the when loss that is wrapped in its surperficial fiber optic loop can be ignored, cut-off directly is 3cm in the present embodiment, section single-mould fiber between CCFL and sensing head encapsulates, avoid outer signals that it is disturbed, the light of the 1550nm that returns in the optical fiber enters optoisolator 6 through the 1550nm end of WDM, surveyed by photodetector 7, the signal that detects enters computing machine and handles.When external world's variation acted on sensing head, the feedback in the optical fiber was owing to photoelastic effect changes, and the light intensity of CCFL output 1550nm changes, and surveys transducing signal by photoelectric detector PD.Signal acts on the sensing head, the light that feedbacks in the single-mode fiber can have corresponding variation along with the variation of signal, adopt signal acquiring system to gather time-domain signal as shown in Figure 3, time-domain signal is that signal intensity is time dependent, time-domain signal is carried out Fast Fourier Transform (FFT), obtain frequency-region signal as shown in Figure 4, at institute plus signal frequency values place, obtain a peak value that exceeds background noise, variation along with institute's plus signal, frequency meeting and institute's plus signal of the size of peak value and correspondence are corresponding one by one, thereby reach the purpose of restituted signal, realize the demodulation of composite chamber laser vibration transducer.
Claims (3)
1. optical fiber composite chamber laser feedback effect sensor, it is characterized in that: the pump light source of 980nm connects first end of wavelength division multiplexer, second end of wavelength division multiplexer and an end of Compound Cavity fiber laser are connected to form the composite chamber laser integral part, Compound Cavity fiber laser other end order mode fiber, the single-mode fiber end is wrapped on the silicon rubber cylinder and constitutes sensing probe, wavelength division multiplexer the 3rd end connects an end of isolator, and the isolator other end connects by computer-controlled photodetector.
2. a kind of optical fiber composite chamber laser feedback effect sensor according to claim 1 is characterized in that: described silicon rubber column diameter scope is 3cm-6cm.
3. optical fiber composite chamber laser feedback effect sensor demodulation method is characterized in that: sensing probe adopts the method for feedback effect to carry out demodulation, and concrete steps are as follows:
(1) measured signal acts on sensing probe, and the light that feeds back in the single-mode fiber is along with signal changes;
(2) the measured signal acquisition system is gathered time-domain signal;
(3) time-domain signal is carried out Fast Fourier Transform (FFT), be converted to frequency-region signal;
(4) the frequency value of frequency-region signal and intensity are carried out demodulation with the frequency value of measured signal and the changing of fluctuation of intensity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010222131 CN101893455A (en) | 2010-07-09 | 2010-07-09 | Optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof |
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| CN 201010222131 CN101893455A (en) | 2010-07-09 | 2010-07-09 | Optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697609A (en) * | 2015-03-24 | 2015-06-10 | 吉林大学 | Optical fiber interference water level sensor |
| CN105953826A (en) * | 2013-11-21 | 2016-09-21 | 充梦霞 | Laser sensor frequency division multiplexing device adopting optical fiber coupler and fiber bragg grating |
| CN106052730A (en) * | 2016-07-28 | 2016-10-26 | 北京邮电大学 | Signal demodulation method and signal demodulation device used in optical fiber distributed sensor system |
| CN110608797A (en) * | 2019-10-29 | 2019-12-24 | 中国人民解放军国防科技大学 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
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| CN101236075A (en) * | 2008-02-29 | 2008-08-06 | 南开大学 | Bending radius measuring apparatus based on optical fibre laser |
| CN101261281A (en) * | 2007-03-07 | 2008-09-10 | 中国科学院半导体研究所 | Optical fibre acceleration sensor based on ultra- short cavity optical fibre laser |
| CN101729145A (en) * | 2009-11-06 | 2010-06-09 | 山东大学 | DFB fiber laser type fiber-optic microphone and distributive array device thereof |
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| CN101261281A (en) * | 2007-03-07 | 2008-09-10 | 中国科学院半导体研究所 | Optical fibre acceleration sensor based on ultra- short cavity optical fibre laser |
| CN101236075A (en) * | 2008-02-29 | 2008-08-06 | 南开大学 | Bending radius measuring apparatus based on optical fibre laser |
| CN101729145A (en) * | 2009-11-06 | 2010-06-09 | 山东大学 | DFB fiber laser type fiber-optic microphone and distributive array device thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953826A (en) * | 2013-11-21 | 2016-09-21 | 充梦霞 | Laser sensor frequency division multiplexing device adopting optical fiber coupler and fiber bragg grating |
| CN106197497A (en) * | 2013-11-21 | 2016-12-07 | 充梦霞 | A kind of laser sensor frequency division multiplexing device using fiber coupler |
| CN106197499A (en) * | 2013-11-21 | 2016-12-07 | 充梦霞 | Use pump light source and the laser sensor frequency division multiplexing device of fiber grating |
| CN106197498A (en) * | 2013-11-21 | 2016-12-07 | 充梦霞 | The method of work of laser sensor frequency division multiplexing device based on fiber grating |
| CN104697609A (en) * | 2015-03-24 | 2015-06-10 | 吉林大学 | Optical fiber interference water level sensor |
| CN106052730A (en) * | 2016-07-28 | 2016-10-26 | 北京邮电大学 | Signal demodulation method and signal demodulation device used in optical fiber distributed sensor system |
| CN106052730B (en) * | 2016-07-28 | 2018-05-08 | 北京邮电大学 | A kind of signal demodulating method and device for distributed fiber-optic sensor system |
| CN110608797A (en) * | 2019-10-29 | 2019-12-24 | 中国人民解放军国防科技大学 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
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Application publication date: 20101124 |