OFDR system vibration detection method based on sliding time gating

A technology of vibration detection and sliding time, which is applied in the field of OFDR system, can solve the problems of high price and increased hardware cost of distributed optical fiber sensing system, and achieve the effect of expanding the frequency response range and increasing the sampling rate

Active Publication Date: 2020-08-25
SHANDONG UNIV
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Problems solved by technology

Although the frequency response range of the system can be increased by increasing the sweep rate of the tunable light source, the hardware cost is greatly increased, which is also a main reason for the high price of the distributed optical fiber sensing system. Therefore, how to effectively solve the system Vibration detection is an important issue in current OFDR systems

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  • OFDR system vibration detection method based on sliding time gating
  • OFDR system vibration detection method based on sliding time gating
  • OFDR system vibration detection method based on sliding time gating

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Embodiment Construction

[0022] Attached below Figure 1-3 The technology will be further described with specific examples to help understand the content of the present invention.

[0023] A kind of OFDR system vibration detection method based on sliding time gating, is characterized in that, comprises the following steps:

[0024] S1. Collect two signals respectively, one is a signal that does not contain vibration information, which is a reference signal; the other is a signal that contains vibration information, which is a test signal;

[0025] S2. Sliding and dividing the reference signal and the test signal into N equal parts in the time domain according to a certain window size, the sampling time is T, and the time of each part is T / N; each part is a segmented signal, and set at the same time Determine the step size P, so as to determine the sampling rate along the sensing fiber, the sampling rate is determined by the step size q, if the duration of the step size q is L, the sampling rate is 1 / ...

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Abstract

The invention discloses an OFDR system vibration detection method based on sliding time gating, and the method comprises the steps: carrying out the processing of collected data through a time gatingmethod in a data processing process of an OFDR system, and achieving the detection of a vibration signal along an optical fiber. Meanwhile, by setting the sliding step length, the effective sampling rate of data processing is improved, so that the frequency response range of the system is increased.

Description

technical field [0001] The invention relates to an OFDR (optical frequency domain reflection) system based on sliding time gating, which is applied to the detection of external vibration information, especially an OFDR system that needs to measure high-frequency vibration signals. Background technique [0002] The safety of national defense, military, civilian facilities and people's lives and properties is a major issue related to the national economy and people's livelihood. Therefore, my country has major technical needs in the fields of perimeter security, long-distance pipeline safety, and large-scale structural health monitoring. Because the optical fiber has strong anti-electromagnetic interference, good electrical insulation and light transmission characteristics. In recent years, distributed optical fiber sensing systems using optical fibers as sensitive components and signal transmission media have attracted more and more attention in national defense, military, an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 秦增光王恒刘兆军徐演平丛振华渠帅李钊冯玉茹
Owner SHANDONG UNIV
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