A Distributed Sensing System Based on Differential Amplification Technology

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...

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

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