Off-resonance photoacoustic spectrometric detection and analysis device

Abstract

An off-resonance photoacoustic spectrometric detection and analysis device consists of a photoacoustic spectrometric module (8). The photoacoustic spectrometric module (8) comprises a light source module (2-1), a photoacoustic signal generation module (2-2), an optical power measurement module (2-3) and a fault diagnostic analysis module (2-4). Optical signals generated by an infrared incoherence light source in the light source module (2-1) are focused by an ellipsoidal reflector to form a focused light beam, the focused light beam is modulated into light of specific frequency and wavelength by chopping blades of an optical chopper and optical filters and then transmitted to the photoacoustic signal generation module (2-2), and the fault diagnostic analysis module (2-4) calculates each gas concentration according to to-be-tested gas photoacoustic signals generated by irradiation, diagnoses faults and alarms. The off-resonance photoacoustic spectrometric detection and analysis device can be used for quantitative detection of gases such as SF6, CF4, SO2F2, SOF2, SO2, SF4 and H2O and is applicable to onsite online monitoring.

Description

technical field [0001] The present invention relates to a kind of SF 6 Decomposition gas detection and internal fault analysis and diagnosis device. Background technique [0002] With sulfur hexafluoride gas (SF 6 ) as electrical equipment for insulation and arc extinguishing medium, such as GIS (Gas-Insulated Switchgear, Gas-Insulated Switchgear), circuit breakers, transformers, switch cabinets, etc., with its advantages of high reliability, small maintenance, and small footprint It develops rapidly and is widely used in the high-voltage and ultra-high-voltage fields of power systems, and has gradually become one of the preferred equipment for modern substations. However, in recent years SF 6 However, some problems and accidents have occurred in the operation of gas-insulated electrical equipment. According to decades of operation and failure statistics, the SF 6 In electrical equipment with insulating gas, the proportion of insulation failures is the highest (more tha...

AI Technical Summary

Problems solved by technology

However, since the infrared incoherent light source is a surface light source, the output power and radiation intensity are low, and the signal divergence of the light source is large. At this time, the power of the light signal penetrating into the photoacoustic cell is very low, resulting in a very weak photoacoustic signal intensity, which is easy to Interferenced by surrounding noise, it is difficult to separate the desired signal, and its detection accuracy is low

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