Optical fiber distributed perturbation sensor of Sagnac interferometer and its perturbation positioning method
A technology of optical fiber distribution and disturbance positioning, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of hardware cost and structural complexity and poor stability, and achieve the effects of good stability, low system cost and simple structure
Inactive Publication Date: 2010-08-18
BEIHANG UNIV
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Need to use two light sources and detectors, as well as devices such as practical wavelength division multiplexers and modulators of different frequencies, which increases the hardware cost and structural complexity of the system, and the stability is poor
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The invention discloses a distributed fiber disturbance sensor of a Sagnac interferometer and a disturbance positioning method thereof, comprising the following steps, using a Sagnac interferometer to couple an arm, synchronously adding a delayed fiber ring, namely superposing a delayed fiber ring in a single Sagnac interferometer to form two Sagnac interferometers with different length; realizing the time division multiplexing of the two Sagnac interferometers with different length by the propagation of optical pulses in the interferometer; and calculating the positions of disturbing points to realize the distributed sensing of the disturbance according to the amplitude of output signals of two Sagnac interferometers. The sensor has the advantages of low cost, simple structure and good stability.
Description
technical field The invention relates to an optical fiber sensor, in particular to a Sagnac interferometer optical fiber distributed disturbance sensor and a disturbance positioning method thereof. Background technique Optical fiber sensors are widely used in industrial, civil and military fields due to their excellent characteristics of anti-electromagnetic interference, small size, light weight, high sensitivity, easy networking, and especially the ability to realize distributed measurement. Among them, the optical fiber distributed disturbance sensor is of great significance in the fields of perimeter alarm, oil pipeline monitoring and acoustic emission monitoring. At present, according to the difference in working principle, optical fiber distributed sensors are mainly divided into four types: interferometer type, fiber grating type, optical time domain reflectometer type, intensity modulation type and scattering type. Among them, the interferometer-type distributed s...
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IPC IPC(8): G01D5/26
Inventor 许文渊梁生李慧张春熹李立京张晞林文台杨玉生
Owner BEIHANG UNIV