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Optical fiber distributed perturbation sensor based on Sagnac interferometer

An optical fiber distribution and interferometer technology, which is applied in the direction of using optical devices to transmit sensing components, can solve the problems of poor stability, increased hardware cost and structural complexity, and achieves 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

Method used

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  • Optical fiber distributed perturbation sensor based on Sagnac interferometer
  • Optical fiber distributed perturbation sensor based on Sagnac interferometer
  • Optical fiber distributed perturbation sensor based on Sagnac interferometer

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Embodiment Construction

[0019] The optical fiber distributed disturbance sensor based on Sagnac interferometer 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.

[0020] 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.

[0021] Pass light into the Sagnac interferometer, and the light waves propagate in the first Sagnac interferometer and the second Sagnac interfe...

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Abstract

The invention discloses a distributed fiber disturbance sensor based on a Sagnac interferometer. A Sagnac interferometer is used for coupling an arm, synchronously a delayed fiber ring is added, namely a delayed fiber ring is superposed in a single Sagnac interferometer to form two Sagnac interferometers with different length; the time division multiplexing of the two Sagnac interferometers with different length is realized by the propagation of optical pulses in the interferometer; and the positions of disturbing points are calculated 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 an optical fiber distributed disturbance sensor based on a Sagnac interferometer. 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 interferometer-type distributed se...

Claims

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Application Information

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IPC IPC(8): G01D5/26
Inventor 张春熹许文渊梁生李立京张晞林文台杨玉生
Owner BEIHANG UNIV
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