Micro-water content fiber laser detector based on secondary modulation and data stitching technology

Abstract

The invention relates to a micro-water content fiber laser detector based on secondary modulation and data stitching technology. The fiber laser detector comprises a one-chip microcomputer, a laser, a first fiber coupler and a probe. A first laser output end of the firs fiber coupler is connected with the probe. A second laser output end of the first fiber coupler is connected with a second fiber coupler, a first laser output end of which is respectively connected with a first photoelectric detector and the one-chip microcomputer. A second laser output end of the second fiber coupler is respectively connected with a reference air chamber, a third photoelectric detector and the one-chip microcomputer. The probe comprises a fiber collimator assembly which is used to couple laser from the inside of fiber to gas and make laser return into fiber. A loop laser signal output end of the first fiber coupler is respectively connected with a second photoelectric detector and the one-chip microcomputer. The one-chip microcomputer is also connected with a temperature and pressure transmitter. The micro-water content fiber laser detector is not easily influenced by infrared radiation such as temperature and the like, is not subject to electromagnetic interference, has better insulating properties and security, and can be used to detect more accurately.

Description

technical field [0001] The invention relates to a detection device, in particular to a detector for detecting the micro-water content in SF6 gas of high-voltage power equipment. Background technique [0002] SF6 gas has been recognized by people for its excellent insulation and arc extinguishing performance, and is widely used in gas insulated switchgear (GIS) and ultra-high voltage power transmission and transformation equipment as an insulating and arc extinguishing medium. However, during the long-term operation of SF6 electrical equipment, the leakage of SF6 gas in the electrical equipment will inevitably occur, resulting in a decrease in the density of SF6 gas in the electrical equipment and an increase in the micro-water content. When the water content in SF6 gas reaches a certain level, under the action of arc or corona, SF6 gas decomposition products will generate toxic gas through hydrolysis reaction, which will cause chemical corrosion to equipment, and then seriou...

AI Technical Summary

Problems solved by technology

Electronic products are susceptible to electromagnetic interference in the detection of power equipment, especially in the detection of SF6 insulation gas break micro water, and are also easy to destroy the electromagnetic field state of the original equipment, reducing the insulation performance and safety of the equipment. Optical infrared sensors are easily affected by the temperature field , resulting in abundant detection error

The gas detection technology based on the principle of laser scanning, because the gas absorption width is broadened under high pressure, so that it is difficult to cover the gas absorption peak with simple current scanning, so it is limited to detection under normal pressure or low pressure

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