Photoacoustic spectrometry detection device adopting axial multilayer filter plate structure

Abstract

The invention relates to a photoacoustic spectrometry detection device adopting an axial multilayer filter plate structure. The photoacoustic spectrometry detection device adopting the axial multilayer filter plate structure comprises light sources, a light source installation support, a mechanical photochopper, a photochopper controller, multiple layers of filter plates, a filter plate drive device, a photoacoustic cell, a circulating air pump, a filter device, an electromagnetic valve, an light emitting opening parabolic reflector, a high-sensitivity microphone, a lock-phase amplifier and an embedded main machine. The photoacoustic spectrometry detection device is characterized in that the multiple layers of filter plates comprise two or more filter plates, each filter plate is of a gear-shaped structure, namely, the outer edge of each filter plate is provided with tooth grooves which are matched with a driving gear on the filter plate drive device. One of filter installation holes of each filter plate is not provided with a filter. Two or more filter plates are coaxially installed, and each filter plate is driven by the filter plate drive device to rotate. The filter plate drive device comprises a drive motor, a guide rail, a drive gear and an adjustable installation base. A plurality of filter plates can be driven by one filter plate drive device.

Description

technical field [0001] The invention relates to a gas detection device, in particular to a photoacoustic spectrum detection device capable of detecting various gases. Background technique [0002] Gas detection technology has a wide range of applications in industrial production and daily life, such as leak detection of oil and gas pipelines, detection of dissolved gases in transformer oil in power systems, detection of exhaust gases from chemical companies, and detection of trace pollutant gases in the air, Exhaled gas detection in human diseases and medical diagnosis, etc. [0003] For example, in the power industry, it is used to detect electrical equipment failures, such as power transformers, SF6, fluorocarbon mixed gas and other gas-insulated electrical equipment failure decomposition gas; [0004] For oil-filled power transformers, the characteristic gases that need to be detected are CH4, C2H4, H2, CO, CO2, C2H2, C2H6, etc. At present, there are many detection meth...

AI Technical Summary

Problems solved by technology

Under this structure, if more filters are to be installed on the filter disc, the diameter of the filter disc needs to be increased, which will cause the size of the filter disc to be too large, resulting in a large volume of detection equipment, and large filters It is also difficult to drive the filter disc to rotate stably

In addition, the reliability of the thermal infrared light source currently used is low, and the spectral distribution cannot completely correspond to the gas to be detected; in addition, for the photoacoustic spectroscopy device using the infrared light source, it is necessary to configure a narrow-band filter, and the qualified narrow-band filter Light sheets are often expensive

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