An on-line gas detection device and method for high voltage electrical equipment

Abstract

The embodiment of the application discloses an online gas detection device and method for high-voltage electrical equipment, wherein the device comprises a first light source, a second light source, a coupler, a first circulator, a second circulator, a first acoustic wave sensor, a second acoustic wave sensor, an optoacoustic cell, a first photodetector, a second photodetector and a signal processing module, the first acoustic wave sensor and the second acoustic wave sensor with different cavity lengths are installed in opposite directions on both sides of an optoacoustic wave, the working point of the first acoustic wave sensor is located at the maximum slope of an interference curve, the working point of the second acoustic wave sensor is located at the minimum slope of the interference curve, the optoacoustic signals of the two measurement paths are opposite, and the vibration signals are in phase, so that the subtraction of external vibration interference is realized by using a differential method. Compared with the scheme of a single microphone combined with an intensity demodulation method in the prior art, the cost does not increase obviously, but the influence of vibration interference is greatly suppressed by using the differential method.

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