Two-channel feedback loop fiber interferometer

A fiber-optic interferometer and feedback loop technology, applied in the field of all-fiber interferometry and fiber-optic sensing, can solve the problems of insensitivity of the cost system and complex structure, and achieve the elimination of reciprocal changes, high phase sensitivity, and system resistance. The effect of strong interference ability

Inactive Publication Date: 2011-06-15
SHANGHAI BOOM FIBER SENSING TECH
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Problems solved by technology

[0002] The interference of light has been widely used in the field of sensing testing and communication technology, especially in the perimeter security, the technology of measuring vibration and stress signals by using light interferometry is becoming more and more perfect. The structure of the vibration signal system is usually relatively complicated, and the resulting cost problem and system insensitivity problem have not been completely solved

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  • Two-channel feedback loop fiber interferometer
  • Two-channel feedback loop fiber interferometer

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Embodiment 1

[0019] Embodiment 1: A dual-channel feedback loop fiber optic interferometer, which is composed of a light source 1, a light detection module 2, a fiber coupler 3, a delay fiber 4, sensing fibers 5 and 7, and feedback devices 6 and 8. Its structural characteristics are as follows: the light source 1 is connected to an input end of the fiber coupler 3, one end of the sensing fiber 7 is connected to an input end of the fiber coupler 3, one end is connected to a reflector 8, and the delay fiber 4 is connected to one of the fiber coupler 3. An input end and an output end; an output end of the optical fiber coupler 3 is connected to a light detection module 2, an output end is connected to a sensing fiber 5, and the end of the sensing fiber 5 is connected to a reflector 6.

[0020] The two coherent optical paths in this embodiment are:

[0021] (1) Light source 1-Fiber coupler 3-Sensing fiber 5-Mirror 6-Sensing fiber 5-Fiber coupler 3-Delay fiber 4-Fiber coupler 3-Sensing fiber 7-Mirror...

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Abstract

The invention discloses a two-channel feedback loop fiber interferometer, belonging to the technical field of fibers. The fiber interferometer adopts a fiber coupler to construct an interference optical path and adopts two feedback devices to form clockwise and counterclockwise paths of coherent light. The system can be applied in the interference systems in any phase size, especially the systems with instable interference signal amplitude. The interferometer not only can be used for sensing such dynamic signals as speed, pressure, strain, sound waves, seismic waves and the like in the harsh and complex environments, but also can realize such functions as optical switches, filters and the like in the all optical communication network and can be widely applied in the perimeter security field.

Description

Technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to the technical field of all-fiber interference. Background technique [0002] Optical interference has been widely used in the field of sensor testing and communication technology, especially in perimeter security. The technology of using optical interference to measure vibration and stress signals is becoming more and more perfect. The existing technology uses all-fiber interference measurement. The structure of the vibration signal system is usually more complicated, and the cost problems and the insensitivity of the system caused by this cannot be completely solved. Summary of the invention [0003] In order to solve the shortcomings of the prior art, the present invention provides a dual-channel feedback loop fiber interferometer. [0004] The purpose of the present invention is achieved as follows: a dual-channel feedback loop fiber interferometer, composed of a light ...

Claims

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Application Information

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IPC IPC(8): G01D5/26G01D5/353G01H9/00G02B6/26
Inventor 杨斌皋魏席刚仝芳轩周正仙
Owner SHANGHAI BOOM FIBER SENSING TECH
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