CN101241029A - Optical fiber Bragg grating sensor demodulator - Google Patents
Optical fiber Bragg grating sensor demodulator Download PDFInfo
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- CN101241029A CN101241029A CNA2007100670836A CN200710067083A CN101241029A CN 101241029 A CN101241029 A CN 101241029A CN A2007100670836 A CNA2007100670836 A CN A2007100670836A CN 200710067083 A CN200710067083 A CN 200710067083A CN 101241029 A CN101241029 A CN 101241029A
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Abstract
The invention discloses an optical fiber Bragg grating sensor demodulator comprising a broad spectrum light resource, a FP light filter, a 2*2 coupler, a measuring FRG grating, a positioning transmission grating, a light fiber air absorbing chamber, a light receiving array, a demodulating circuit, a collecting card and a control circuit. This invention has the advantages that: 1, reference light path obtains section of measuring light wave length via the positioning transmission grating, reduces time of calculation and peak-seeking, fastens the real time detecting speed; 2, feature absorbing spectrum line of the air absorbing chamber serves as reference, reduces influence for the measurement caused by environment temperature, enhances precision of the measurement; 3, optical fiber grating sensor demodulator of this invention has extensive application which is suitable for measuring optical fiber grating sensor and wavelength.
Description
Technical field
The present invention relates to relate to sensory field of optic fibre, specifically a kind of optical fiber Bragg grating sensor demodulator.
Background technology
In the fiber grating temperature sensor field, the variation of ambient temperature can cause the minor shifts of grating bragg wavelength, and the minor shifts that how to detect the sensing grating bragg wavelength is the key issue that fiber Bragg grating sensor practicability faces.A variety of demodulation methods are arranged at present, and as instruments such as spectrometer, monochromators, but spectrometer one is on the high side, is not suitable for domestic consumer.In addition as adopt F-P demodulation by filter, but also exist measurement result influenced by ambient temperature, the problem that measuring accuracy is not high.
Summary of the invention
What the present invention will solve is the problems referred to above that prior art exists, and a kind of follow-on optical fiber Bragg grating sensor demodulator is provided, and is intended to improve measuring accuracy, and simplified structure reduces cost.
For achieving the above object, technical solution of the present invention is: optical fiber Bragg grating sensor demodulator, comprise wide spectrum light source, the FP optical filter, the 2*2 coupling mechanism, measure the FBG grating, location transmission FBG grating, the fiber-optic fiber gas absorption chamber, the light-receiving array, amplifying circuit, two-way capture card of AD/DA and control circuit, it is characterized in that described wide spectrum light source and FP optical filter composition tunable light source, be divided into two-way light by the 2*2 coupling mechanism, enter respectively and measure light path and reference path: enter the light of measuring light path and pass through to measure the FBG grating, and through measuring the FBG optical grating reflection, through the laggard light inlet receiving array of coupling mechanism unit, the light that enters reference path is through location transmission FBG grating and the laggard light inlet receiving array of fiber-optic fiber gas absorption chamber again; From the analog electrical signal of light-receiving array output by amplifying circuit, after the AD of the two-way capture card of AD/DA module is converted into digital signal, import computing machine; Produce a digital controlled signal after the Computer Processing, be converted into analog control signal, be input to the FP optical filter through amplifying circuit, control circuit again through the DA of the two-way capture card of AD/DA module.
Optical fiber Bragg grating sensor demodulator of the present invention adopts optical filter to realize the scanning within the specific limits of transmitted light wavelength, by the wide range gas absorption spectra as a reference.Its principle of work is as follows:
The light that wideband light source produces is formed tunable light source by the FP optical filter, be divided into two light paths by the 2*2 coupling mechanism, one the tunnel enters the measuring optical fiber grating, and the light through measuring optical grating reflection enters the light-receiving array element through coupling mechanism again, obtains the relation of reflection peak and FP optical filter scanning voltage; Another road is a reference path, form by a transmission grating and an air chamber, gas in the air chamber has the characteristic absorption spectral line to light, light enters the light-receiving array element by both, obtain the relation of the peak value and the FP optical filter scanning voltage of transmission peaks, we select wherein two absorption peaks, selected foundation is that the reflection peak that makes us measure is in the middle of both, because the absorption peak wavelength value is known, two paths of data obtains by measuring the wavelength value of optical grating reflection by the computing interpolation calculation.The location grating mainly makes computing machine and finds the wavelength peak that needs than being easier to, and generally requires the smaller grating of temperature sensitivity.
The present invention has the following advantages:
1. reference path reduces and calculates and the peak-seeking time by the interval of location transmission grating acquisition measuring light wavelength, makes real-time detection speed accelerate.
2. by the gas absorption chamber characteristic absorpting spectruming line as a reference, reduce the influence of environment temperature, improve measuring accuracy measuring.
3. fiber Bragg grating (FBG) demodulator applied range of the present invention is in applicable fiber-optic grating sensor and the wavelength measurement.
As a further improvement on the present invention, described amplifying circuit comprises amplification module, filtration module and biasing module, the AD module that enters the two-way capture card of AD/DA from the analog electrical signal of light-receiving array output amplification module and the filtration module by described amplifying circuit; The digital controlled signal that produces after the Computer Processing is converted into analog control signal through the DA of the two-way capture card of AD/DA module, and amplification module and the biasing module through amplifying circuit is input to control circuit again.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is C in the fiber-optic fiber gas absorption chamber
2H
2The absorption spectra line chart of gas.
Fig. 3 is the spectrum of location grating, air chamber absorption peak 1, sensing grating peak value and air chamber absorption peak 2.
Embodiment
With reference to Fig. 1, optical fiber Bragg grating sensor demodulator, comprise wide spectrum light source, the FP optical filter, the 2*2 coupling mechanism, measure the FBG grating, location transmission FBG grating, the fiber-optic fiber gas absorption chamber, the light-receiving array, amplifying circuit, two-way capture card of AD/DA and control circuit, described amplifying circuit comprises amplification module, filtration module and biasing module, described wide spectrum light source and FP optical filter are formed tunable light source, be divided into two-way light by the 2*2 coupling mechanism, enter respectively and measure light path and reference path: enter the light of measuring light path and pass through to measure the FBG grating, and through measuring the FBG optical grating reflection, through the laggard light inlet receiving array of coupling mechanism unit, the light that enters reference path is through location transmission FBG grating and the laggard light inlet receiving array of fiber-optic fiber gas absorption chamber again; From amplification module and filtration module by amplifying circuit of the analog electrical signal of light-receiving array output, after the AD of the two-way capture card of AD/DA module is converted into digital signal, import computing machine; Produce a digital controlled signal after the Computer Processing, be converted into analog control signal through the DA of the two-way capture card of AD/DA module, amplification module biasing module, the control circuit through amplifying circuit is input to the FP optical filter again.
The explanation of functional module:
1. wide spectrum light source: output wavelength 1520nm-1570nm;
2. optical filter (FP tunable optic filter) operating wavelength range: 1520nm-1570nm, each FSR (Free Spectral Range) tuning voltage is less than 12V;
3.2 * 2 coupling mechanism;
4.FBG sensing grating (Fiber Bragg Grating FBG) centre wavelength is at 1530nm-1540nm, reflectivity is greater than 90%;
5.FBG location grating, centre wavelength near 1530nm, temperature sensitive encapsulation;
6. fiber-optic fiber gas absorption chamber: C
2H
2Gas, operating wavelength range 1510nm-1540nm, its absorption spectra line chart is as shown in Figure 2;
7. capture card: be the 1M of NI company acquisition rate, have DA (digital-to-analogue) and AD (modulus) function simultaneously, DA mainly produces 3Hz triangular voltage sweep signal, adds that by control circuit certain bias voltage is added in the tuning voltage input end of tunable optic filter.AD gathers two-way and measures light path and reference path data, obtains to measure temperature for later process.
The concrete course of work of the present invention is as follows:
The light that wideband light source produces is formed a tunable optical source wavelength coverage from 1520nm to 1570nm by the FP optical filter, be divided into two light paths by 2 * 2 coupling mechanisms, one the tunnel enters the FBG sensing grating, return through 2 * 2 coupling mechanisms again through the light of sensing grating reflection and to enter the light-receiving array element, obtain the relation of FBG sensing grating centre wavelength value (centre wavelength value along with ambient temperature changes can drift) and FP optical filter scanning voltage; Another road is a reference path, form by a location grating and an air chamber, the standard of gas in the air chamber to there is characteristic absorpting spectruming line to measure by light as us, enter the light-receiving array element at last, obtain comprising the relation of location grating peak value and air chamber absorption peak and FP optical filter scanning voltage, we select wherein two absorption peaks of air chamber, selected foundation is to make the reflection peak of our sensing grating be in two absorption peaks of air chamber in the middle of both, because the absorption peak wavelength value is known, two paths of data obtains wavelength by the sensing grating reflection by the computing interpolation calculation.The location grating mainly makes computing machine and finds the wavelength peak that needs than being easier to, and generally requires the smaller grating of temperature sensitivity.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (3)
1. optical fiber Bragg grating sensor demodulator, comprise wide spectrum light source, the FP optical filter, the 2*2 coupling mechanism, measure the FBG grating, location transmission FBG grating, the fiber-optic fiber gas absorption chamber, the light-receiving array, amplifying circuit, two-way capture card of AD/DA and control circuit, it is characterized in that described wide spectrum light source and FP optical filter composition tunable light source, be divided into two-way light by the 2*2 coupling mechanism, enter respectively and measure light path and reference path: enter the light of measuring light path and pass through to measure the FBG grating, and through measuring the FBG optical grating reflection, through the laggard light inlet receiving array of coupling mechanism unit, the light that enters reference path is through location transmission FBG grating and the laggard light inlet receiving array of fiber-optic fiber gas absorption chamber again; From the analog electrical signal of light-receiving array output by amplifying circuit, after the AD of the two-way capture card of AD/DA module is converted into digital signal, import computing machine;
Produce a digital controlled signal after the Computer Processing, be converted into analog control signal, be input to the FP optical filter through amplifying circuit, control circuit again through the DA of the two-way capture card of AD/DA module.
2. optical fiber Bragg grating sensor demodulator as claimed in claim 1 is characterized in that being filled with in the described fiber-optic fiber gas absorption chamber gas N that light is had the characteristic absorption spectral line
2H
2
3. optical fiber Bragg grating sensor demodulator as claimed in claim 1 or 2, it is characterized in that described amplifying circuit comprises amplification module, filtration module and biasing module, the AD module that enters the two-way capture card of AD/DA from the analog electrical signal of light-receiving array output amplification module and the filtration module by described amplifying circuit; The digital controlled signal that produces after the Computer Processing is converted into analog control signal through the DA of the two-way capture card of AD/DA module, and amplification module and the biasing module through amplifying circuit is input to control circuit again.
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| CNA2007100670836A CN101241029A (en) | 2007-02-09 | 2007-02-09 | Optical fiber Bragg grating sensor demodulator |
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| CNA2007100670836A CN101241029A (en) | 2007-02-09 | 2007-02-09 | Optical fiber Bragg grating sensor demodulator |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832791A (en) * | 2010-04-13 | 2010-09-15 | 浙江大学 | Fiber grating sensor wavelength demodulating system based on C8051F320 singlechip |
| CN101949744A (en) * | 2010-09-06 | 2011-01-19 | 国网电力科学研究院武汉南瑞有限责任公司 | Fiber grating-based transformer internal temperature detection system |
| CN102098101A (en) * | 2011-01-04 | 2011-06-15 | 武汉理工大学 | Crest searching method and system |
| CN101769762B (en) * | 2010-01-29 | 2011-10-19 | 武汉理工大学 | Sensing demodulating system for optical chirped-grating |
| CN102313559A (en) * | 2010-07-09 | 2012-01-11 | 上海华魏光纤传感技术有限公司 | Closed loop multi-functional fiber grating sensing device for built-in standard measurement source and method |
| CN102944255A (en) * | 2012-11-20 | 2013-02-27 | 武汉理工光科股份有限公司 | Instrument and method for demodulating digital fiber bragg grating |
| CN105758434A (en) * | 2015-10-12 | 2016-07-13 | 北京信息科技大学 | FBG reflectance spectrum sensing demodulation method based on linear array InGaAs scanning |
| CN112344974A (en) * | 2020-10-21 | 2021-02-09 | 北京自动化控制设备研究所 | Phase demodulation system and demodulation method for interference type optical fiber sensor |
| CN116046036A (en) * | 2023-04-03 | 2023-05-02 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing demodulation system |
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2007
- 2007-02-09 CN CNA2007100670836A patent/CN101241029A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769762B (en) * | 2010-01-29 | 2011-10-19 | 武汉理工大学 | Sensing demodulating system for optical chirped-grating |
| CN101832791A (en) * | 2010-04-13 | 2010-09-15 | 浙江大学 | Fiber grating sensor wavelength demodulating system based on C8051F320 singlechip |
| CN102313559A (en) * | 2010-07-09 | 2012-01-11 | 上海华魏光纤传感技术有限公司 | Closed loop multi-functional fiber grating sensing device for built-in standard measurement source and method |
| CN102313559B (en) * | 2010-07-09 | 2016-03-30 | 上海华魏光纤传感技术有限公司 | A kind of closed loop multifunctional optical fiber optical grating sensing device and method of built-in standard volume source |
| CN101949744A (en) * | 2010-09-06 | 2011-01-19 | 国网电力科学研究院武汉南瑞有限责任公司 | Fiber grating-based transformer internal temperature detection system |
| CN101949744B (en) * | 2010-09-06 | 2012-08-08 | 国网电力科学研究院武汉南瑞有限责任公司 | Fiber grating-based transformer internal temperature detection system |
| CN102098101A (en) * | 2011-01-04 | 2011-06-15 | 武汉理工大学 | Crest searching method and system |
| CN102098101B (en) * | 2011-01-04 | 2013-05-08 | 武汉理工大学 | Crest searching method and system |
| CN102944255B (en) * | 2012-11-20 | 2016-02-10 | 武汉理工光科股份有限公司 | Digital optical fiber grating demodulation instrument and method |
| CN102944255A (en) * | 2012-11-20 | 2013-02-27 | 武汉理工光科股份有限公司 | Instrument and method for demodulating digital fiber bragg grating |
| CN105758434A (en) * | 2015-10-12 | 2016-07-13 | 北京信息科技大学 | FBG reflectance spectrum sensing demodulation method based on linear array InGaAs scanning |
| CN105758434B (en) * | 2015-10-12 | 2018-04-10 | 北京信息科技大学 | Sensing demodulation method based on linear array InGaAs scanning FBG reflectance spectrums |
| CN112344974A (en) * | 2020-10-21 | 2021-02-09 | 北京自动化控制设备研究所 | Phase demodulation system and demodulation method for interference type optical fiber sensor |
| CN112344974B (en) * | 2020-10-21 | 2022-05-20 | 北京自动化控制设备研究所 | Phase demodulation system and demodulation method for interference type optical fiber sensor |
| CN116046036A (en) * | 2023-04-03 | 2023-05-02 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing demodulation system |
| CN116046036B (en) * | 2023-04-03 | 2023-05-30 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing demodulation system |
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