Fiber bragg grating vibration measurement system based on pulse coding and edge filtering method

A technology of fiber grating and pulse coding, which is applied in the direction of measuring device, measuring ultrasonic/sonic wave/infrasonic wave, using wave/particle radiation, etc. It can solve the problem of attenuation of feedback signal of fiber grating vibration sensor, insufficient accuracy of measurement results, and limitation of measurement distance and other issues, to achieve the effect of improving spatial resolution, increasing measurement distance, and reducing costs

Pending Publication Date: 2018-03-09
GUANGXI NORMAL UNIV
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Problems solved by technology

[0003] When performing detection, such as monitoring high-risk areas such as earthquakes and volcanoes, the common fiber grating vibration sensor feedback signal at

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  • Fiber bragg grating vibration measurement system based on pulse coding and edge filtering method
  • Fiber bragg grating vibration measurement system based on pulse coding and edge filtering method
  • Fiber bragg grating vibration measurement system based on pulse coding and edge filtering method

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Embodiment Construction

[0029] see figure 1 , in a preferred embodiment of the present invention, the fiber grating vibration measurement system based on pulse coding and edge filtering method includes a narrow linewidth laser 1, a pulse signal generator 2, an electro-optic modulator 3, a circulator 4, a single mode fiber 5, fiber grating 6, photodetector 7 and digital signal processing unit 8. The output end of the narrow linewidth laser 1 is connected to the optical input end of the electro-optic modulator 3, and the continuous light output by it is injected into the electro-optic modulator 3 through the optical input end of the electro-optic modulator 3; the pulse signal generator 2 The output terminal of the electro-optic modulator is connected to the radio frequency input terminal of the electro-optic modulator 3, and the coded electrical pulse signal output by it is injected into the electro-optical modulator 3 through the radio frequency input terminal of the electro-optic modulator 3, and the...

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Abstract

The invention provides a fiber grating vibration measurement system based on pulse coding and edge filtering, which belongs to the technical field of fiber grating sensors, and includes a narrow line width laser, a pulse signal generator, an electro-optic modulator, a circulator, a single-mode fiber, an optical fiber Grating, photodetector and digital signal processing unit; the output end of the narrow linewidth laser is connected to the optical input end of the electro-optic modulator, the output end of the pulse signal generator is connected to the radio frequency input end of the electro-optic modulator, and the output end of the electro-optic modulator is connected to The first port of the circulator and the second port of the circulator are sequentially connected to a single-mode fiber and a fiber grating, the photodetector is connected to the third port of the circulator, and the digital signal processing unit is connected to the photodetector. The fiber grating vibration measurement system made by the present invention using the principle of pulse encoding and edge filtering has the monitoring and measurement functions of an optical time domain reflectometer (OTDR), and solves the problem that the sensing distance and spatial resolution cannot be improved simultaneously in the OTDR system contradiction.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensors, in particular to a fiber grating vibration measurement system based on pulse coding and edge filtering. Background technique [0002] Vibration is an important parameter that reflects the normal state of an object, such as the vibration of a bridge, the vibration of a large instrument when it is working, etc. When the vibration exceeds a certain range, it may bring serious consequences, so the measurement of vibration is very important for the health monitoring of large structures . Fiber Bragg grating sensors have been widely concerned and applied because of their strong anti-electromagnetic interference ability, corrosion resistance, small size, and high sensitivity, such as for building health monitoring, aircraft structure safety monitoring, land subsidence and earthquake real-time monitoring, etc. When the fiber grating is used for vibration monitoring, the sensor is embedded ...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 胡君辉陆杭林杜婧吴天银邵来鹏
Owner GUANGXI NORMAL UNIV
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