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- W1970000996 abstract "We have designed an intensity-demodulated sensing system based on Fabry-Perot interferometer and fiber Bragg grating(FBG) for pressure measurement. The structure of the sensor probe is presented. It is an optical fiber extrinsicFabry-Perot interferometer(EFPI) composed of silica tube and optical fibers. The variable quantity of cavity length of theEFPI is equal to that of silica tube, which has direct proportion to external pressure. The sensing system is interrogatedby broadband light. In order to compensate intensity fluctuation, we use an FBG as a narrow band filter to obtain thesensing signal and reference signal from white-light interference fringe returned from EFPI. The sensing signal is in thereflected beam from FBG, and the reference signal is contained in reflected beam and transmitted beam of FBGsimultaneously. Then two output light signals are transformed into current signals by two photodiodes. Subsequently twocurrent signals are processed at the same time. After the signals being treated with circuit, the inherent disadvantage ofintensity-demodulated sensor is removed. It is also to say the sensing system has immunity from the drift of light sourcepower and fluctuation in fiber attenuation by using only a FBG. Meanwhile, the system has advantages of fast response,simple circuitry, strong ability of intensity compensation and low cost. Experimental results show that the experimentaldata are consistent with theoretical analysis. The dynamic range of sensor is from 0 to 500KPa, and the resolutionreaches to 0.5KPa. The sensing system can be used to measure pressure in inflammable and explosive circumstance suchas oil height of super oil storage tanks." @default.
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- W1970000996 date "2009-05-11" @default.
- W1970000996 modified "2023-09-26" @default.
- W1970000996 title "Fabry-Perot fiber pressure sensor based on white light interferometry and intensity demodulation method" @default.
- W1970000996 doi "https://doi.org/10.1117/12.828669" @default.
- W1970000996 hasPublicationYear "2009" @default.
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