Double-sideband distributed type optical fiber sensing system parameter measuring device

Abstract

The invention discloses a double-sideband distributed type optical fiber sensing system parameter measuring device. The double-sideband distributed type optical fiber sensing system parameter measuring device comprises a distributed type optical fiber sensing system based on a Brilouin optical time domain analysis (BOTDA) technology, a light orthogonal frequency division multiplexing (OFDM) signal producing module, an OFDM detecting module and a signal processing module, wherein the distributed type optical fiber sensing system comprises a first laser device, a second laser device, a first optical coupler, a first electro-optic modulator, a second electro-optic modulator, a first amplifier, a second amplifier, a pulse / random sequence generator, a circulator and a single mode optical fiber which is taken as a sensing optical fiber, and the light OFDM signal producing module comprises an OFDM signal generator, a digital-analog conversion module and a drive module. The double-sideband distributed type optical fiber sensing system parameter measuring device can improve measuring time and measuring precision, expand a measured dynamic range, and improve the reliability and the real-time performance of the distributed type optical fiber sensing system, and is suitable for long distance distributed type optical fiber sensing system parameter measurement.

Description

【Technical field】 [0001] The invention relates to the technical field of optical fiber measurement, in particular to a parameter measurement device of a double-sideband distributed optical fiber sensing system. 【Background technique】 [0002] In the power system, it is often necessary to conduct online monitoring of certain parameters of equipment such as cables and wind power equipment that have been exposed to the atmosphere for a long time. For example, high temperature and fire are common accidents that affect the safe operation of the power system. Therefore, the quality of online temperature monitoring is a very important aspect affecting the safe operation of power systems. If early warnings can be made through temperature measurement and measures can be taken quickly in the early stages of safety accidents, such safety accidents can be effectively avoided. The traditional temperature measurement method is to install point temperature sensing elements such as thermoco...

AI Technical Summary

Problems solved by technology

However, this technology has the following problems: (1) high frequency stabilization requirements for light sources; (2) due to the need for a large number of analysis points, in order to improve the test sensitivity, multiple averages are required, so the test time is very long; (3) the gain-type sensing method It will cause a sharp decrease in the energy of the pump light, making it difficult to achieve long-distance detection

[0007] The lossy BOTDA distributed optical fiber sensing technology based on microwave external modulation mainly has the following technical defects: (1) the single-ended scheme cannot realize long-distance sensing; (2) in order to improve the measurement accuracy, it is necessary to measure multiple frequency points, multiple Average, so the measurement time is longer; (3) Because this program needs to perform statistical analysis on a large number of experimental data, it has high requirements for experimental equipment and environment

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