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Distributed fiber sensing system based on periodically non-uniform sampling technology

A distributed optical fiber, non-uniform sampling technology, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc. the effect of

Inactive Publication Date: 2017-08-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] In the prior art, the research on the vibration sensing system based on fiber optic technology has been very extensive, but the existing measurement methods cannot realize the accurate measurement of the vibration position and the broadband vibration signal at the same time, and it is difficult to achieve the technical indicators in practical engineering applications.

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  • Distributed fiber sensing system based on periodically non-uniform sampling technology
  • Distributed fiber sensing system based on periodically non-uniform sampling technology

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Embodiment Construction

[0010] A distributed sensing system based on periodic non-uniform sampling technology of the present invention, its structure is: light source (1), acousto-optic modulator (2), signal generator (3), erbium-doped fiber amplifier (4), Composed of optical filter (5), three-port circulator (6), sensing fiber (7), photodetector (8) and data acquisition card (9); light source (1) and acousto-optic modulator (2) The input end is connected to the optical path, and the output end 1 of the signal generator (3) is connected to the driving end of the acousto-optic modulator (2); the acousto-optic modulator (2) modulates the input light and outputs the light to the erbium-doped fiber amplifier (4), the erbium-doped fiber amplifier (4) amplifies the input light and then outputs the light to the optical filter (5) for noise reduction processing, and the light after the noise reduction processing is transmitted to the three The input end of the port circulator (6), the output end of the three...

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Abstract

The invention discloses a distributed fiber sensing system based on periodically non-uniform sampling technology. The system comprises a light source, an acousto-optic modulator, a signal generator, erbium-doped fiber amplifier, an optical filter, a three-port circulator, a sensing fiber, a photoelectric detector and a data collection card. The system detects vibration position and frequency through the periodically non-uniform sampling technology, and can realize high-precision detection of the wide-frequency vibration position and vibration signals.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a distributed optical fiber sensing system based on periodic non-uniform sampling technology. Background technique [0002] Vibration measurement has potential application value in engineering fields, such as structural health monitoring, aerospace, petrochemical, power system and other safety monitoring; traditional vibration measurement methods such as mechanical measurement and electrical measurement have low sensitivity and large volume 1. The measurement range is limited by the amplification device, and the traditional vibration measurement method can only perform point measurement, which is limited in practical application. Therefore, it is imperative to develop a high-performance distributed vibration measurement system. [0003] Distributed optical fiber sensing technology refers to the continuous modulation of the light wave in the optical fiber by the extern...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 何茜谭国伟刘嵘唐立军
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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