CN101476901A - Demodulation system and method for optical fiber Fabry-Perot sensor - Google Patents
Demodulation system and method for optical fiber Fabry-Perot sensor Download PDFInfo
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- CN101476901A CN101476901A CNA2009103002864A CN200910300286A CN101476901A CN 101476901 A CN101476901 A CN 101476901A CN A2009103002864 A CNA2009103002864 A CN A2009103002864A CN 200910300286 A CN200910300286 A CN 200910300286A CN 101476901 A CN101476901 A CN 101476901A
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Abstract
The invention provides a demodulation system for an optical F-P sensor. The system effectively overcomes the drawback that the prior demodulation system is susceptible to the influences of the external environment and the parameter drift of the system. The demodulation system for the optical fiber F-P sensor is first sequentially connected with two or three power supplies with different wavelengths, modulators and a coupler, then sequentially connected with a coupler or a circulator and a photoelectric detector and a photoelectric detector separately in two ways, and finally connected with a data acquisition card and a computer. The invention makes use of the excellent dynamicity of a density demodulation method and uses carrier wave technology to overcome the drawback that the prior demodulation method is susceptible to the influences of the external environment and the parameter drift of the system effectively to make the density demodulation method really practical.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, particularly relate to a kind of demodulating system and demodulation method thereof that adopts the optical fiber Fabry-Perot sensor of ZAP.
Technical background
Fibre Optical Sensor has safety, be not subjected to electromagnetic interference (EMI), be convenient to networking and remote remote measurement, be suitable for series of advantages such as rugged surroundings, becomes one of mainstream development direction of new generation sensor gradually.Sensor for temperature cross-sensitivity based on Fabry-perot optical fiber (FP) chamber is very little, and sensor disturbs little to optical signalling, very high resolution can be provided, and has obtained using widely.
According to the difference of separating the optical parametric that timing utilizes, Fabry-perot optical fiber sensing and demodulating scheme can be divided into intensity demodulation and phase demodulating two big classes.Intensity demodulation is when input optical wavelength is constant, owing to external temperature, pressure, STRESS VARIATION cause the long variation of medium refraction index and chamber, FP chamber in the chamber, thereby has changed the optical path difference of two bundle coherent lights, and then causes the variation of Fabry-Perot sensor output intensity.Therefore the changing value by the stellar interferometer output intensity just can obtain the size that external temperature, pressure, stress etc. change.The deficiency of intensity demodulation existence at present is: be operated in reflected light interference spectum slope maximum in order to make the FP chamber, need the chamber long and Wavelength matched, this acquires a certain degree of difficulty when the FP chamber makes; Secondly also be subjected to the influence of external environment and light source intensity fluctuation easily.The phase demodulating method is owing to need measure spectrum thereby can not be used for the high speed kinetic measurement.
Summary of the invention
Technical scheme to be solved by this invention provides a kind of demodulating system of optical fiber Fabry-Perot sensor, and this system has effectively avoided traditional intensity demodulation system to be subject to the shortcoming of external environment influence and systematic parameter drift influence own.
The present invention also will provide a kind of demodulation method of above-mentioned demodulating system, and this method has effectively avoided traditional intensity demodulation method to be subject to the shortcoming of external environment influence and systematic parameter drift influence own.
The technical scheme that technical solution problem of the present invention is adopted is: the demodulating system of optical fiber Fabry-Perot sensor, this system is connected with light source, modulator, the coupling mechanism of 2 or 3 different wave lengths according to this, one the tunnel be connected with coupling mechanism or circulator, photodetector according to this then, another road is connected with photodetector, is connected with data collecting card and computing machine at last according to this.
The demodulation method of optical fiber Fabry-Perot sensor, this method may further comprise the steps: 1) optical modulation of the different wave length that 2 or 3 light sources are sent is to the carrier wave of different frequency; 2) after being coupled to an optical fiber, coupling mechanism is divided into two paths of signals again; 3) one road signal is squeezed into coupling mechanism or the circulator that is connected with optical fiber F-P sensor, and another road signal is directly squeezed into photodetector; 4) the optical fiber F-P sensor reflected light signal inserts the photodetector detection by coupling mechanism or circulator; 5) signal that detects of two-way photodetector is sent into computing machine through the data collecting card collection together and is carried out signal Processing, finishes the filtering to two or three frequency carriers, draws each wavelength light intensity separately, and the chamber that draws optical fiber F-P sensor by computing is long.
The invention has the beneficial effects as follows: the present invention has utilized the good advantage of intensity demodulation method dynamic, adopt ZAP, effectively avoid traditional intensity demodulation method to be subject to the shortcoming of external environment influence and systematic parameter drift influence own, really make the intensity demodulation method be able to practicability.
Description of drawings
Fig. 1 is the system chart that the present invention adopts 2 light sources.
Fig. 2 is the system chart that the present invention adopts 3 light sources.
Embodiment
System of the present invention is connected with light source, modulator, the coupling mechanism of 2 or 3 different wave lengths according to this, one the tunnel be connected with coupling mechanism or circulator, photodetector according to this then, another road is connected with photodetector, is connected with data collecting card and computing machine at last according to this.
Method of the present invention may further comprise the steps: 1) light of the different wave length that 2 or 3 light sources are sent by modulators modulate to the carrier wave of different frequency; 2) after being coupled to an optical fiber, coupling mechanism is divided into two paths of signals again; 3) one road signal is squeezed into coupling mechanism or the circulator that is connected with optical fiber F-P sensor, and another road signal is directly squeezed into photodetector; 4) the optical fiber F-P sensor reflected light signal inserts the photodetector detection by coupling mechanism or circulator; 5) signal that detects of two-way photodetector is sent into computing machine through the data collecting card collection together and is carried out signal Processing.Signal Processing is mainly finished the filtering to two or three frequency carriers, draws each wavelength light intensity separately, and the chamber that draws optical fiber F-P sensor by computing is long, thereby has avoided the influence of external environment to test result.
The present invention adopts ZAP first, just with the optical modulation of 2 or 3 different wave lengths to the carrier wave of different frequency, and then squeeze into optical fiber Fabry-Perot sensor, this is different from the traditional double wavelength.
Said modulator can adopt electrooptic modulator, acousto-optic modulator, or directly adopts internal modulation.The effect of photodetector is to convert light signal to electric signal.
Claims (4)
- The demodulating system of [claim 1] optical fiber Fabry-Perot sensor, it is characterized in that, this system is connected with light source, modulator, the coupling mechanism of 2 or 3 different wave lengths according to this, one the tunnel be connected with coupling mechanism or circulator, photodetector according to this then, another road is connected with photodetector, is connected with data collecting card and computing machine at last according to this.
- The demodulating system of [claim 2] optical fiber Fabry-Perot sensor as claimed in claim 1 is characterized in that, described modulator adopts electrooptic modulator or acousto-optic modulator.
- The demodulation method of [claim 3] optical fiber Fabry-Perot sensor is characterized in that, this method may further comprise the steps: 1) optical modulation of the different wave length that 2 or 3 light sources are sent is to the carrier wave of different frequency; 2) after being coupled to an optical fiber, coupling mechanism is divided into two paths of signals again; 3) one road signal is squeezed into coupling mechanism or the circulator that is connected with optical fiber F-P sensor, and another road signal is directly squeezed into photodetector; 4) the optical fiber F-P sensor reflected light signal inserts the photodetector detection by coupling mechanism or circulator; 5) signal that detects of two-way photodetector is sent into computing machine through the data collecting card collection together and is carried out signal Processing, finishes the filtering to two or three frequency carriers, draws each wavelength light intensity separately, and the chamber that draws optical fiber F-P sensor by computing is long.
- The demodulation method of [claim 4] optical fiber Fabry-Perot sensor as claimed in claim 3 is characterized in that, electrooptic modulator or acousto-optic modulator modulation are adopted in the described modulation of step 1, or directly adopt internal modulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009103002864A CN101476901B (en) | 2009-01-20 | 2009-01-20 | Demodulation system and method for optical fiber Fabry-Perot sensor |
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| CN2009103002864A CN101476901B (en) | 2009-01-20 | 2009-01-20 | Demodulation system and method for optical fiber Fabry-Perot sensor |
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| CN101476901A true CN101476901A (en) | 2009-07-08 |
| CN101476901B CN101476901B (en) | 2010-12-08 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864911A (en) * | 2015-05-29 | 2015-08-26 | 北京航空航天大学 | High-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement |
| WO2016041214A1 (en) * | 2014-09-15 | 2016-03-24 | 江苏昂德光电科技有限公司 | F-p cavity optical fiber pressure sensing device and demodulation method thereof |
| CN105890679A (en) * | 2016-06-20 | 2016-08-24 | 天津大学 | Optical fiber Fabry-Perot type flow measuring device with local bending for flow guiding and measuring method |
| CN106125348A (en) * | 2016-06-08 | 2016-11-16 | 哈尔滨工业大学 | A kind of fast tunable reconfigurable microwave photon filter based on electric light Fa-Po cavity |
| CN106482862A (en) * | 2016-09-29 | 2017-03-08 | 西安交通大学 | A kind of demodulation method of optical fiber F P temperature sensor and system |
| CN106770029A (en) * | 2016-11-16 | 2017-05-31 | 电子科技大学 | A kind of face type optic fibre refractive index sensor array measurement system and method |
| CN108507597A (en) * | 2018-04-09 | 2018-09-07 | 西安工业大学 | Optical fiber Fabry-Perot sensor demodulating equipment and method |
| CN109443403A (en) * | 2018-11-21 | 2019-03-08 | 北京遥测技术研究所 | A kind of optical fiber EFPI sensor demodulating equipment |
| CN112097808A (en) * | 2020-08-18 | 2020-12-18 | 中国科学院空天信息创新研究院 | F-P interference optical fiber sensing system based on phase generation carrier modulation |
| CN113670359A (en) * | 2021-08-26 | 2021-11-19 | 中国核动力研究设计院 | High-speed demodulation system and method for optical fiber Fabry-Perot sensor |
-
2009
- 2009-01-20 CN CN2009103002864A patent/CN101476901B/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016041214A1 (en) * | 2014-09-15 | 2016-03-24 | 江苏昂德光电科技有限公司 | F-p cavity optical fiber pressure sensing device and demodulation method thereof |
| CN104864911A (en) * | 2015-05-29 | 2015-08-26 | 北京航空航天大学 | High-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement |
| CN106125348B (en) * | 2016-06-08 | 2019-05-10 | 哈尔滨工业大学 | A kind of fast tunable reconfigurable microwave photon filter based on electric light Fa-Po cavity |
| CN106125348A (en) * | 2016-06-08 | 2016-11-16 | 哈尔滨工业大学 | A kind of fast tunable reconfigurable microwave photon filter based on electric light Fa-Po cavity |
| CN105890679B (en) * | 2016-06-20 | 2019-11-22 | 天津大学 | The Fabry-perot optical fiber formula flow rate test method of local buckling water conservancy diversion |
| CN105890679A (en) * | 2016-06-20 | 2016-08-24 | 天津大学 | Optical fiber Fabry-Perot type flow measuring device with local bending for flow guiding and measuring method |
| CN106482862A (en) * | 2016-09-29 | 2017-03-08 | 西安交通大学 | A kind of demodulation method of optical fiber F P temperature sensor and system |
| CN106770029A (en) * | 2016-11-16 | 2017-05-31 | 电子科技大学 | A kind of face type optic fibre refractive index sensor array measurement system and method |
| CN106770029B (en) * | 2016-11-16 | 2020-06-02 | 电子科技大学 | End-face type optical fiber refractive index sensor array measuring system and method |
| CN108507597A (en) * | 2018-04-09 | 2018-09-07 | 西安工业大学 | Optical fiber Fabry-Perot sensor demodulating equipment and method |
| CN109443403A (en) * | 2018-11-21 | 2019-03-08 | 北京遥测技术研究所 | A kind of optical fiber EFPI sensor demodulating equipment |
| CN109443403B (en) * | 2018-11-21 | 2021-09-07 | 北京遥测技术研究所 | Optical fiber EFPI sensor demodulating device |
| CN112097808A (en) * | 2020-08-18 | 2020-12-18 | 中国科学院空天信息创新研究院 | F-P interference optical fiber sensing system based on phase generation carrier modulation |
| CN113670359A (en) * | 2021-08-26 | 2021-11-19 | 中国核动力研究设计院 | High-speed demodulation system and method for optical fiber Fabry-Perot sensor |
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| CN101476901B (en) | 2010-12-08 |
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