Laser photoacoustic spectrometry device for measuring multi-component gas by adoption of single photoacoustic cell

Abstract

The invention discloses a laser photoacoustic spectrometry device for measuring multi-component gas by adoption of a single photoacoustic cell. The device comprises a stop valve (1), a particulate matter filtering device (2), a gas drying device (3), an electromagnetic switching valve I (4), a pressure sensor (5), an electromagnetic switching valve II (6), a sound velocity nozzle (7), a vacuum pump (8), a quantum cascading laser array module (9), a spectroscope module (10), a to-be-measured reference gas chamber (11), a differential resonance photoacoustic cell (12), a photoelectric conversionmodule (13), a thermostat (14), an optical power detector (15), an extinction pool (16), a phase-locked amplification circuit (17) and an industrial personal computer (18), wherein the quantum cascading laser array module (9) couples multiple beams of laser into one beam of light path. According to the device, multiple faulty gas components can be measured by the single photoacoustic cell at thesame time. The device has the advantages of being strong in anti-jamming capability, good in long-term stability of equipment, high in precision and free of later maintenance, and is capable of measuring trace gas to gas with a concentration of 100%.

Description

technical field [0001] The invention belongs to the technical field of photoacoustic spectrum gas detection, and in particular relates to an on-line monitoring or off-line detection device for characteristic gas components in electric power, nuclear energy, and petrochemical industries. Background technique [0002] In the power / nuclear energy industry, power transformers, GIS and other equipment will decompose and produce various gases that can reflect the nature of faults and insulation aging performance; accurate detection of faults and aging characteristic gases is the key to realizing the operation status diagnosis of important substation equipment; ethanol, etc. The raw materials of basic chemical materials and fine chemical products are mainly natural gas. Accurate and real-time monitoring of raw materials and gas components and content in the production process is the core to ensure the quality of the above chemical products. Real-time and accurate detection of CO, C...

AI Technical Summary

Problems solved by technology

However, most traditional differential photoacoustic cells use a single photoacoustic cell with a single laser. The differential photoacoustic cell is only filled with a standard gas of a component to be detected, which can only meet the detection of a single gas. When there are many types, the system structure will become very complicated

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