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Closed loop all-fiber interference system

An interference system, all-fiber technology, applied in the field of all-fiber interference and optical fiber sensing, can solve the problems of complex structure, insensitive cost system, etc., achieve high phase sensitivity, eliminate reciprocity changes, and improve extraction ability. Effect

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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Embodiment Construction

[0019] The invention discloses a closed-loop all-fiber interference system. The invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0020] A closed-loop all-fiber interference system is composed of a light source 1, a light detection module 2, a 3×3 fiber coupler 3, a delay fiber 4 and a sensing fiber 5. Its structural features are as follows: the light source 1 and the light receiving module 2 are connected to the input end of the 3×3 fiber coupler 3 respectively, and the other input end of the 3×3 fiber coupler 3 passes through the delay fiber 4 and the 3×3 fiber coupler 3 One output end is connected, and the other two output ends of the 3×3 fiber coupler 3 are connected through a sensing fiber 5 .

[0021] The two coherent optical paths of the present invention are:

[0022] (1) Light source 1-fiber coupler 3-delay fiber 4-sensing fiber 5-light detection module 2

[0023] (2) Light source 1-fiber coupler 3-...

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Abstract

The invention discloses a closed loop all-fiber interference system, belonging to the technical field of fibers. The system is characterized in that an optical source and an optical receiver module are respectively connected with one input end of a fiber coupler; another input end of the fiber coupler is connected with one output end of the fiber coupler via a delay fiber; and other two output ends of the fiber coupler are connected with each other via a sensing fiber. Two beams of coherent light interfere with each other in the optical receiver module. The system can be applied in the interference systems in any phase size, especially the systems with instable interference signal amplitude.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to the technical field of all optical fiber interference. Background technique [0002] Optical interference has been widely used in the field of sensing testing and communication technology, especially in perimeter security, the technology of using optical interferometry to measure vibration and stress signals is becoming more and more perfect. The existing technology uses all-fiber interferometry to measure 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. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the invention provides a closed-loop all-fiber interference system. [0004] The object of the present invention is achieved as follows: a closed-loop all-fiber interference system is composed of a li...

Claims

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Application Information

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