A detection system and method with an anti-vibration enhanced gas photoacoustic in-situ detection mechanism

By employing multiple sets of symmetrical microphones and oil-gas separation membranes in the photoacoustic spectroscopy detection device, combined with signal differential and superposition processing technology, the vibration resistance and sensitivity issues of the photoacoustic spectroscopy oil dissolved gas detection device under vibration environment are solved, achieving efficient and reliable in-situ detection.

CN121521990BActive Publication Date: 2026-06-26WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
Filing Date
2025-11-14
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing photoacoustic spectroscopy devices for detecting dissolved gases in oil suffer from problems such as low degassing efficiency, long response time, complex structure, poor vibration resistance, and limited detection accuracy, especially in vibration environments.

Method used

By employing a design with multiple symmetrically arranged microphones and oil-gas separation membranes, combined with signal differential and superposition processing technology, in-situ photoacoustic detection of vibration-resistant and sensitive gases is achieved. By setting multiple symmetrical microphones in the central section of the photoacoustic cell, external vibration noise interference is eliminated, and an oil-gas separation membrane is set at the inlet of the photoacoustic cell, which is directly connected to the detection oil circuit, eliminating the need for a degassing unit.

Benefits of technology

It achieves highly sensitive in-situ detection in vibration environments, simplifies the detection process, shortens the response time, and improves detection reliability and efficiency, making it suitable for complex scenarios such as substations.

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Abstract

The application discloses a detection system and method with an anti-vibration and sensitivity-enhanced gas photoacoustic in-situ detection mechanism, which comprises an excitation light source and a collimating assembly, a photoacoustic cell and a signal processing unit. The laser emitted by the excitation light source and the collimating assembly is arranged along the central axis of the photoacoustic cell. A plurality of groups of microphones are arranged on the central section of the photoacoustic cell. Each group of microphones comprises two microphones symmetrically arranged on the left and right sides or the upper and lower sides of the central section of the photoacoustic cell. The signal processing unit receives the signals of each microphone, processes the signals, and the central section of the photoacoustic cell is a section perpendicular to the axial direction of the photoacoustic cell and located in the middle of the photoacoustic cell. The excitation light source and the collimating assembly emit laser, the signal processing unit collects and processes the signals of the plurality of groups of microphones, and the concentration of the dissolved gas in the oil circuit is obtained according to the corresponding matching relationship between the signal processing result of the signal processing unit and the gas concentration.
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