A Composite Detection Device Based on Multi-core Optical Fiber Sensor

Abstract

The invention discloses a composite detection device based on a multi-core optical fiber sensor, which relates to the field of sensing and detection, including a light source module, an optical fiber coupling module, a sensing and detecting optical fiber module, an imaging optical fiber module, a sensing and demodulating module, a photoelectric conversion module, Signal processing module and host computer; the light source module generates broadband optical signals and transmits them to the fiber coupling module; The detection fiber module detects the curvature, temperature, refractive index and stress information of the object to be measured and sends it to the signal processing module through the sensing demodulation module; the imaging fiber module is used to measure the image information of the object to be measured and sends it to the The signal processing module, the signal processing module processes the received two-way electrical signals and transmits them to the host computer after signal processing. The present invention can simultaneously detect a plurality of different parameters.

Description

technical field [0001] The invention relates to the field of sensing detection, in particular to a composite detection device based on a multi-core optical fiber sensor. Background technique [0002] The invention patent with the application number of 201310710629.0 discloses a multi-core optical fiber, a sensing device using the multi-core optical fiber, and an operation method thereof, which adopts an optical fiber with three or more cores, and at least one core is used as the optical signal core. , other fiber cores are used as sensing fiber cores. The lengths of the test fiber core and the sensing fiber core in the fiber are different. Fiber cores with different lengths obtain different optical signals at the same physical quantity to be measured. The detection results are obtained after comparison. The cores are helically distributed and have different lengths, which is difficult to manufacture and has a high cost. This method can only test the same parameter at differe...

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Problems solved by technology

[0002] The invention patent with the application number 201310710629.0 discloses a multi-core optical fiber, a sensing device using the multi-core optical fiber and its operating method. It uses an optical fiber with three or more cores, and at least one core is used as the optical signal core , the other core is used as the sensing core, the lengths of the test core and the sensing core in the fiber are different, the cores of different lengths obtain different optical signals at the same position of the physical quantity to be measured, and the detection results are obtained after comparison. The fiber cores are distributed in a spiral shape and have different lengths, making it difficult to manufacture and costly. This method can only test the same parameter at different positions, and cannot test multiple parameters at the same time. The test range is small

[0003] The invention patent with the application number CN201310258720.3 discloses a distributed sensing method of multi-core optical fiber, which uses space division multiplexing to realize distributed sensing of multi-core optical fiber, but it does not explain how to eliminate The cross influence of temperature, strain, pressure and other environmental parameters on the sensing fiber, or how to simultaneously detect temperature, strain, pressure and other environmental parameters

The invention patent with the application number 201310258720.3 discloses a method for manufacturing an interferometer by dislocation fusion splicing of multi-core optical fibers. This method adopts the method of space division multiplexing and realizes the integration of multi-channel interferometers on one optical fiber. However, the method It does not specify which physical quantities can be detected, how to distinguish and eliminate the influence of each physical quantity, and does not specify the method and steps of using multiple channels to detect physical quantities, and requires a multi-core coupler to extract the optical signal in the fiber core, which increases the interferometer. cost and complexity

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