Parameter measuring device of distributed optical fiber sensing system

Abstract

The invention provides a parameter measuring device of a distributed optical fiber sensing system. The parameter measuring device comprises the distributed optical fiber sensing system based on the BOTDA (Brillouin optical time domain analysis) technology, an optical OFDM (orthogonal frequency division multiplexing) signal generating module, on OFDM detecting module and a signal processing module. The distributed optical fiber sensing system comprises a laser, a coupler, a first electro-optical modulator, a second electro-optical modulator, a pulse / random sequence generator, a circulator and a single mode fiber serving as a sensing fiber. By the parameter measuring device, the problems the measuring precision is low, measuring range is limited and measuring results are singular in the prior art can be solved.

Description

【Technical field】 [0001] The invention relates to the technical field of parameter measurement of electric power systems, 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 It is a very important aspect that affects the safe operation of the power system. If the early warning of a safety accident can be carried out through temperature measurement and measures can be taken quickly, such safety accidents can be effectively avoided. [0003] The distributed optical fiber measurement system can realize multi-point and online distributed m...

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

[0008] The loss-type BOTDA distributed optical fiber sensing technology based on microwave external modulation mainly has the following technical defects: (1) In order to improve the measurement accuracy, it is necessary to measure multiple frequency points and average multiple times, so the measurement time is long; (2) the scheme Because a large amount of experimental data needs to be statistically analyzed, the requirements for experimental equipment and environment are very high.

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