Long-distance, high-spatial-resolution sensing method based on collaboration of MZI sensing and Brillouin sensing

A high spatial resolution, sensing method technology, applied in the field of distributed optical fiber sensing, can solve problems such as only reaching 100 meters, restricting the application in the field of structural health monitoring, etc., to improve the measurement rate and space, and eliminate the spatial resolution Contradictions with measurement accuracy, the effect of improving spatial resolution

Active Publication Date: 2016-06-29
广东恒志信息技术有限公司
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Problems solved by technology

The dynamic response capability of interferometric optical fiber sensing is good, but the spatial resolution can only reach about 100 meters, which restricts its application in the field of structural health monitoring

Method used

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  • Long-distance, high-spatial-resolution sensing method based on collaboration of MZI sensing and Brillouin sensing

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] (1) The laser light from the narrow-linewidth laser (10) passes through the optical coupler (13) and then splits into two, respectively entering the optical modulator (12) and the optical coupler (15).

[0024] (2) The light from the optical modulator (12) enters the optical coupler (4) through the optical modulator (11), and then splits into two into the sensing optical fiber (5) and the reference optical fiber (9). The states of the light modulator (12) and the light modulator (11) depend on the signal processing and control unit (17).

[0025] (3) The light coming out of the sensing fiber (5) and the reference fiber (9) passes through the optical coupler (6), enters the optical coupler (15) through the return fiber (16), and then reaches the photodetector (14).

[0026] (4) The light entering the optical coupler (15) from the optical coupler (13) passes th...

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Abstract

The invention discloses a long-distance and high spatial resolution sensing method based on the cooperation of MZI sensing and Brillouin sensing. The MZI sensor first obtains the abnormal area of ​​temperature or strain, and then the measurement range of Brillouin sensing Set in the abnormal area determined by MZI sensing. It combines the superior performance of MZI sensing and Brillouin sensing. Therefore, combining MZI can eliminate the contradiction between spatial resolution and measurement accuracy in Brillouin sensing. At the same time, the measurement range of the Brillouin sensor is determined by the spatial resolution of the MZI for each measurement. Using the fast response capability of MZI sensing, it is possible to determine the approximate area where temperature or strain occurs. According to the temperature or strain abnormal area determined by MZI sensing, the Brillouin sensing measurement range is determined in the above area, so that the measurement rate and spatial resolution of the distributed optical fiber sensing system can be greatly improved.

Description

technical field [0001] The invention relates to a long-distance, high spatial resolution distributed optical fiber sensing method based on the cooperation of MZI sensing and Brillouin sensing. Background technique [0002] The invention is proposed aiming at the problems existing in the distributed optical fiber sensing technology with long distance and high spatial resolution. [0003] In distributed optical fiber sensing, there are mainly two methods: interference type and scattering type. [0004] Interferometric optical fiber sensing mainly includes distributed optical fiber sensing based on the Sagnac effect and Mach-Zehnder interferometer (MZI) distributed optical fiber sensing. The dynamic response capability of interferometric optical fiber sensing is good, but the spatial resolution can only reach about 100 meters, which restricts its application in the field of structural health monitoring. [0005] Scattering sensing mainly includes distributed optical fiber sen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/322
Inventor 万生鹏高鹏何兴道
Owner 广东恒志信息技术有限公司
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