Simple optoacoustic detector for detecting high-corrosion gas

Abstract

The invention relates to the field of optoacoustic detection, and provides a simple optoacoustic detector for detecting high-corrosion gas. The simple optoacoustic detector comprises an infrared laser, an infrared laser beam, an optoacoustic pool, an energy meter, a cantilever, a probe laser beam, a probe laser, a photodiode detector, a differential amplification circuit, a digital-to-analogue conversion circuit and a computer, wherein the photodiode diode detector is sequentially connected with the differential amplification circuit, the digital-to-analogue conversion circuit and the infrared laser; the cantilever is made of mica materials and is positioned in the optoacoustic pool; the distance from the photodiode detector to the surface of the cantilever is about 10cm; the infrared laser beam can enter the optoacoustic pool; the energy meter is positioned at the back side of the optoacoustic pool; the energy of each laser pulse can be measured; the optoacoustic signal can be normalized; the probe laser beam can be directly irradiated onto the surface of the cantilever and can be reflected to the photodiode detector; the signal distinguished regulation can be realized through inclining the photodiode.

Description

technical field [0001] The invention relates to the field of photoacoustic detection, in particular to a simple photoacoustic detector for detecting highly corrosive gases which is suitable for detecting toxic and harmful gases in industrial processes. Background technique [0002] Photoacoustic spectroscopy (PAS) is a spectroscopic technique based on the photoacoustic (PA) effect. As an important branch of spectroscopy, it is different from traditional spectroscopy in that it does not detect the optical signal after the interaction between light and matter. It is an acoustic signal, which overcomes many difficulties in sample analysis of traditional spectroscopy. A photoacoustic spectrum detection system is generally composed of a light source, a photoacoustic cell, and an acoustic signal detector. The transducer unit of the sound pressure signal contained in the acoustic signal detector plays a crucial role in the sensitivity of the gas detection and the performance of the...

AI Technical Summary

Problems solved by technology

For gas samples, the molecules absorb the energy of the excitation light to generate heat, which generates sound pressure. The gas detection technology based on photoacoustic spectroscopy can monitor various toxic and harmful gases, and has important practical significance for the overall development of gas detection technology. , but the sound pressure signal transducer unit used in the existing photoacoustic spectroscopy application does not have certain specific chemical resistance, and cannot be used immediately after direct contact with corrosive gases in practical applications

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