A optical fiber micro -vibration dynamic detection system

A measurement system and micro-vibration technology, which is applied in the direction of measurement devices, geophysical measurement, and measurement of ultrasonic/sonic/infrasonic waves. The effect of increasing sensitivity

Active Publication Date: 2022-08-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0010] In view of this, it is necessary to provide a fiber optic micro-vibration detection and measurement system to solve the technical problems that the existing micro-vibration detection methods are susceptible to electromagnetic interference and cannot meet the requirements in terms of accuracy and reliability.

Method used

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  • A optical fiber micro -vibration dynamic detection system
  • A optical fiber micro -vibration dynamic detection system
  • A optical fiber micro -vibration dynamic detection system

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Embodiment Construction

[0032] The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

[0033] Please refer to figure 1 , the present invention provides an optical fiber micro-vibration detection measurement system, comprising at least one vibration conduction mechanism 1 , a sensing optical fiber 2 and a detection mechanism 3 .

[0034] The vibration transmission mechanism 1 includes a base 11, a support column 12, a first pulley 13, a second pulley 14 and a mass block 15. The base 11 is placed on the ground of the detection environment and forms a force coupling with the ground. The lower end of the column 12 is fixed to the base 11 , the support column 12 can also be...

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Abstract

The invention discloses an optical fiber micro-vibration detection measurement system, comprising at least one vibration transmission mechanism, a sensing optical fiber and a detection mechanism; the vibration transmission mechanism includes a base, a support column, a first pulley, a second pulley and a mass block; the sensing fiber It is wound around the first pulley and the second pulley, and one end of the sensing fiber is connected with the detection mechanism; the detection mechanism is used to inject a narrow linewidth laser pulse into the sensing fiber, and at the same time receive the backscattered light in the sensing fiber, And demodulate the phase change of the backscattered light. The beneficial effects of the invention are as follows: a distributed optical fiber sensing system based on phase demodulation uses the sensing optical fiber as a sensor to detect micro-vibration signals, and detects the phase change of the backscattered light in the sensing optical fiber along the path of the sensing optical fiber. For the vibration information of each point, the distributed optical fiber sensing system based on phase demodulation has the unique advantages of simple structure, easy layout, high cost performance, and can realize large-scale and high-precision measurement.

Description

technical field [0001] The invention relates to the technical field of micro-vibration detection, in particular to an optical fiber micro-vibration detection measurement system. Background technique [0002] As a very important micro-vibration wave, seismic wave has always been a major focus of micro-vibration research. The study of seismology originated from the need of human beings to resist earthquake disasters. Early seismology mainly studied and recorded the macroscopic phenomenon of earthquakes and the geographical distribution of earthquakes from the perspective of geology. At the beginning of the 20th century, due to the recording and analysis of seismic waves, seismology developed from a macroscopic description to a mathematical science, expanding the research field, and some branch disciplines appeared, with various applications. [0003] Seismic wave detection is a key method to obtain surface hydrological information, understand the process and mechanism of maj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/18G01H9/00
CPCG01V1/181G01H9/004
Inventor 闫志君石正宣肖翔鹏李豪孙琪真
Owner HUAZHONG UNIV OF SCI & TECH
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