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

Abstract

The parameter measuring device of the bilateral band distributed optical fiber sensing system disclosed by the present invention includes a distributed optical fiber sensing system based on BOTDA technology, an optical OFDM signal generation module, an OFDM detection module and a signal processing module; wherein the distributed optical fiber sensing The sensing system includes a first laser and a second laser, a first optical coupler, a first electro-optic modulator and a second electro-optic modulator, a first amplifier and a second amplifier, a pulse / random sequence generator, a circulator and as a sensor The single-mode optical fiber of the optical fiber; the optical OFDM generating module includes an OFDM signal generator, a digital-to-analog conversion module and a driving module; the present invention can improve measurement time and accuracy, expand the dynamic range of measurement, and improve the reliability of a distributed sensing system And real-time, and suitable for parameter measurement of long-distance distributed optical fiber sensing system.

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 a power system, it is often necessary to perform online monitoring of certain parameters of equipment such as cables and wind power equipment that are exposed to the atmosphere for a long time. For example, high temperature and fire are common accidents that affect the safe operation of power systems. Therefore, the quality of temperature online monitoring is a very important aspect affecting the safe operation of the power system. If early warnings can be made through temperature measurement and measures can be taken quickly in the early stage of safety accidents, such safety accidents can be effectively avoided. The traditional temperature measurement method is to install point temperature sensing elements such as thermocouples in ...

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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