Distributed optical fiber sensing system and detection method for smart grid

Abstract

The invention belongs to a distributed Raman optical fiber sensing system, and discloses a smart grid-oriented distributed optical fiber Raman sensing system and a detection method that take into account both long sensing distance and high spatial resolution. The system includes a pulse laser, a wavelength division Multiplexer, sensing optical fiber, first photodetector, second photodetector and data acquisition system, the pulsed laser output from the pulsed laser enters the sensing optical fiber after passing through the wavelength division multiplexer, and the Stokes reflected in the sensor After passing through the wavelength division multiplexer, the Sri Lankan light and the anti-Stokes light are detected by the first photodetector and the second photodetector and then sent to the data acquisition system. A part of the sensing fiber is set in the constant temperature bath, and the constant temperature bath is used to It is used for constant temperature control of the sensing optical fiber located therein; the data acquisition system is used for data acquisition and demodulation to obtain distributed temperature field information along the sensing optical fiber. The invention improves the resolution and measurement accuracy of the system, and can be applied to the field of smart grid detection.

Description

technical field [0001] The invention belongs to a distributed Raman optical fiber sensing system, in particular to a smart grid-oriented distributed optical fiber Raman sensing system and a detection method that take both long sensing distance and high spatial resolution into consideration. Background technique [0002] The high-voltage power transmission network throughout the country has become the lifeblood of modern industry and the national economy. With the increasing complexity and precision of the power supply network, the security monitoring of the power grid is becoming more and more urgent. Because there are many links in the power supply system that are easily disturbed by various factors, if the hidden dangers and faults in the power supply system cannot be discovered in time, major safety accidents are very likely to occur. However, the current single-point, multi-probe, and single-parameter sensors cannot meet the large-scale and long-distance detection requi...

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the deficiencies of the existing technology, and the technical problem to be solved is: to propose a smart grid-oriented distributed optical fiber Raman sensing system and detection method that takes into account both long sensing distance and high spatial resolution, so as to solve the current There is a problem that the spatial resolution and sensing distance of the distributed optical fiber Raman sensing system cannot be balanced, so that the spatial resolution of the system can be increased to 1 cm

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