Parameter Measurement Device of Single Sideband Distributed Optical Fiber Sensing System

Abstract

A parameter-measuring system for a single side band distributed optical fiber sensing system, which is provided by the invention, comprises the BOTDA (Brilouin Optical Time Domain Analysis) technology-based distributed optical fiber sensing system, an optical OFDM (Orthogonal Frequency Division Multiplexing) signal generation module, an OFDM detection module and a signal processing module; the BOTDA technology-based distributed optical fiber sensing system comprises a laser, a coupler, a first electrooptical modulator, a second electrooptical modulator, an amplifier, an optical filter, a pulse / random sequence generator, a circulator and a transformer winding made of a wound single-mode optical fiber as a sensing optical fiber; the OFDM signal generation module comprises an OFDM signal generator, a digital-to-analog converter and a driving module; and the OFDM detection module comprises a detection module, an analog-to-digital converter and a channel estimation module. The parameter-measuring system can prolong the time of measurement, increase the precision of measurement, broaden the dynamic range of measurement and enhance the reliability and real-timeness of the distributed 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 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 thermocouples in importa...

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

Images