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A Distributed Optical Fiber Sensing System for Improving Vibration Measurement Sensitivity

A technology of distributed optical fiber and sensing system, which is applied in measuring devices, measuring ultrasonic/acoustic/infrasonic waves, instruments, etc., and can solve the problems of scattered light power fluctuations, signal fading, and low vibration sensitivity

Active Publication Date: 2021-07-06
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, due to the sensitive change of the phase of the scattered light field in the traditional Φ-OTDR vibration sensing system, when the external environment of the demodulation part of the system changes, it will also lead to fluctuations in the scattered light power and signal fading, resulting in poor sensitivity for measuring vibration. high

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  • A Distributed Optical Fiber Sensing System for Improving Vibration Measurement Sensitivity

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0014] In the embodiment of the present invention, a distributed optical fiber sensing system based on Φ-OTDR and Mach-Zehnder interferometer is provided. figure 1 Description, including: the narrow linewidth light source 1 is connected to the acousto-optic modulator 2, one end of the electro-optic modulator 2 is connected to the pulse generator 3, and the other end is connected to the 1*2 optical coupler 4, and the splitting ratio of the optical coupler is 90:10. 90% of the way is connected to the erbium-doped amplifier 5, and 10% of the way is connected to the 2*2 optical coupler 12, the erbium-d...

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Abstract

The invention discloses a distributed optical fiber sensing system for improving the sensitivity of vibration measurement. The system includes: a narrow line width light source, an electro-optical modulator, a pulse generator, an optical coupler, an optical fiber circulator, piezoelectric ceramics, and a photoelectric balance detection system. detector, Mach-Zehnder interferometer, and single-mode sensing fiber. Due to the sensitivity of the phase change of the scattered light field in the traditional Φ‑OTDR vibration sensing system, when the external environment of the demodulation part of the system changes, it will also cause fluctuations in the scattered light power and signal fading. This system can reduce the vibration signal. Weakening, increased vibration sensitivity.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a distributed optical fiber sensing system that improves the sensitivity of vibration measurement. Background technique [0002] Φ-OTDR optical fiber sensing technology has good real-time performance and high sensitivity, and is suitable for online detection of large-scale and fully distributed vibration signals. Compared with traditional vibration sensors, Φ-OTDR vibration sensing system is suitable for real-time online monitoring of large-scale and long-distance objects, and has broader application prospects in construction industry, power system, petrochemical industry, security, military, aerospace and other fields . However, due to the sensitive change of the phase of the scattered light field in the traditional Φ-OTDR vibration sensing system, when the external environment of the demodulation part of the system changes, it will also lead to fluctuations in th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 文晓艳向李程
Owner WUHAN UNIV OF TECH