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Optical fiber distributed perturbation sensor of Sagnac interferometer and its perturbation positioning method

A fiber distribution and disturbance positioning technology, applied in the direction of using optical devices to transmit sensing components, can solve problems such as poor stability, increased hardware cost and structural complexity, and achieve the effects of good stability, simple structure and low cost

Inactive Publication Date: 2009-07-22
BEIHANG UNIV
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Problems solved by technology

[0008] 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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  • Optical fiber distributed perturbation sensor of Sagnac interferometer and its perturbation positioning method
  • Optical fiber distributed perturbation sensor of Sagnac interferometer and its perturbation positioning method
  • Optical fiber distributed perturbation sensor of Sagnac interferometer and its perturbation positioning method

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Embodiment Construction

[0020] Sagnac interferometer fiber optic distributed disturbance sensor of the present invention, its preferred embodiment is as follows figure 2 As shown, it includes a Sagnac interferometer, a branch arm is coupled to the sensing fiber of the Sagnac interferometer, and an optical delay device is set on the branch arm to form two Sagnac interference instrument. The branch arm can be coupled out by arranging two couplers on the sensing fiber of the Sagnac interferometer, or can be coupled out by other light splitting or coupling devices.

[0021] Wherein, the light wave of the first Sagnac interferometer propagates along the original sensing fiber without passing through the support arm; the light wave of the second Sagnac interferometer passes through the support arm and propagates along the original sensing fiber.

[0022] The optical delay device may be a delay fiber ring, or other optical delay devices.

[0023] The length of the delay fiber loop may be equal to the len...

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Abstract

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 [0001] 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 [0002] 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. [0003] 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. [0004] Among them, the i...

Claims

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Application Information

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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
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