Demodulation system and method for optical fiber Fabry-Perot sensor
A technology of Fap sensor and demodulation method, which is applied in the field of optical fiber sensing, can solve the problems that the intensity demodulation method is easily affected by the external environment and drift, and achieves good dynamics and avoids the effects of system parameter drift
Active Publication Date: 2010-12-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] The technical solution to be solved by the present invention is to provide a demodulation method of an optical fiber F-P sensor, which effectively avoids the shortcomings of the traditional intensity demodulation method that is easily affected by the external environment and the drift of its own system parameters
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[0009] The system of the present invention is connected with 2 or 3 light sources of different wavelengths, modulators, couplers according to this, then one road is connected with couplers or circulators, photodetectors according to this, the other road is connected with photodetectors, and finally according to This connection has the data acquisition card and the computer.
[0010] The method of the present invention comprises the following steps: 1) modulate the light of different wavelengths emitted by 2 or 3 light sources onto carriers of different frequencies through a modulator; signal; 3) One signal is injected into the coupler or circulator connected with the fiber optic FAPO sensor, and the other signal is directly injected into the photodetector; 4) The reflected light signal of the fiber optic FAPO sensor is connected to the photodetector through the coupler or circulator 5) The signals detected by the two photoelectric detectors are collected by the data acquisitio...
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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 [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a demodulation method of an optical fiber F-P sensor using carrier technology. technical background [0002] Optical fiber sensors have a series of advantages such as safety, immunity to electromagnetic interference, easy networking and long-distance telemetry, and suitable for harsh environments, and have gradually become one of the mainstream development directions of the new generation of sensors. Sensors based on fiber-optic Farpert (FP) cavities have little cross-sensitivity to temperature, and the sensor has little interference to optical signals, and can provide high resolution, which has been widely used. [0003] According to the different optical parameters used in the demodulation, the demodulation schemes of fiber-optic F-P sensing can be divided into two categories: intensity demodulation and phase demodulation. Intensity demodulation is when the wavel...
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IPC IPC(8): G01D5/26G02F2/00G02B6/26
Inventor 冉曾令饶云江徐富国
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA