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A Distributed Sensing System Based on Differential Amplification Technology

A technology of differential amplification and sensing system, which is applied in the direction of transmitting sensing components, measuring devices, instruments, etc. by using optical devices, which can solve the problem of non-adjustable range of data acquisition cards and achieve stable work

Active Publication Date: 2017-10-24
SOUTHWEST JIAOTONG UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Since the long-distance Brillouin time-domain analysis system needs to collect a large amount of data, it needs to use a data acquisition card for data acquisition. There is a large DC component in the data that has not been removed, and the range of the data acquisition card is not adjustable. When it is large, a large quantization error occurs

Method used

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  • A Distributed Sensing System Based on Differential Amplification Technology
  • A Distributed Sensing System Based on Differential Amplification Technology
  • A Distributed Sensing System Based on Differential Amplification Technology

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] figure 1 It is a structural diagram of a distributed optical fiber sensing system based on differential amplification in the present invention. As shown in the figure, the system consists of two parts: an optical path and an electric circuit. The continuous light output by the adjustable distributed feedback laser 1 is divided into two paths after passing through the optical coupler 2, and one path is modulated by the acousto-optic modulator 3 (pulse signal is injected into the acousto-optic modulator) and then enters the erbium-doped fiber amplifier 4 for further processing. Amplified, then filtered by the optical filter 5, and then enters the optical fiber; the other routing light passes through the polarization controller 6, enters the electro-optic modulator 7, then enters the polarization scrambler 8 and optical isolator 9, and then enters the sensing optic...

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Abstract

The invention discloses a distributed optical fiber sensing system based on differential amplification technology. It consists of two parts: optical path detection and circuit demodulation; the optical path uses two microwave signals of different frequencies to modulate onto the signal light: the frequency of one microwave signal is within the Brillouin frequency shift frequency, and the frequency of the other microwave signal is higher than that of the Brillouin frequency shift. The deep frequency shift frequency is slightly lower; on the circuit, a power divider is used to separate the two signals, filter and demodulate them separately, and then perform differential amplification to amplify the demodulated signal. The differential amplification structure is used to amplify the signal collected by the data acquisition card in a specific amplitude range, which solves the problem that the upper computer data acquisition card range is limited in the distributed Brillouin time domain analysis sensor system, and the DC component is large. Time cannot meet the accuracy of data collection, which leads to the problem that the accuracy of system measurement is reduced. The device of the invention works stably, and can accurately measure the temperature (or stress) change position and temperature value (or stress value) in multiple measurements.

Description

technical field [0001] The present invention relates to a distributed optical fiber sensing technology—a demodulation technology in a distributed Brillouin time-domain analysis sensing system, specifically applying it to a distributed Brillouin time-domain analysis sensing system , forming a distributed optical fiber sensing system based on differential amplification and demodulation. Background technique [0002] In recent years, with the rapid development of oil and gas pipelines, high-speed rail, and large buildings, distributed optical fiber sensing technology has attracted more and more attention from all walks of life. Due to its many advantages, distributed optical fiber sensing technology has become a The key technology for external information perception in long-distance and harsh environments. The Brillouin time-domain analysis technology is a member of the distributed optical fiber sensing technology family, and its main function is to use the Brillouin frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01D21/02
Inventor 邵理阳张云鹏李宗雷张志勇闫连山潘炜罗斌邹喜华
Owner SOUTHWEST JIAOTONG UNIV
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