Differential type resonant photoacoustic cell for gas photoacoustic spectrometry detection
A resonant photoacoustic cell and photoacoustic spectroscopy technology, which is applied in the direction of material analysis, measurement device, and material analysis by optical means, can solve problems such as poor stability, inability to measure high-concentration gas to be measured, and poor anti-interference ability.
Active Publication Date: 2019-05-17
CHONGQING UNIV +1
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Problems solved by technology
[0005] The purpose of the present invention is to solve the technical problems of poor long-term working stability, poor anti-interference ability and inability to measure high-concentration gas to be measured in the resonant photoacoustic cell in the prior art
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[0024] Through the following examples, the technical solution of the present invention is further described.
[0025] figure 1 A schematic structural diagram of a differential resonant photoacoustic cell for gas photoacoustic spectroscopy detection according to an embodiment of the present invention is shown. Such as figure 1 As shown, the differential resonant photoacoustic cell includes a test gas chamber 1, a reference gas chamber 2, a resonant photoacoustic cell 3, light entrance windows 4 and 4', isolation windows 5 and 5', light exit windows 6 and 6' , Acoustic-to-electric conversion module 7, preamplifier circuit and filter circuit 8.
[0026] In one embodiment, the cross-sectional shape of the differential resonant photoacoustic cell is a "two" shape. The test gas chamber 1 and the reference gas chamber 2 are arranged symmetrically on both sides of the central axis of the differential resonant photoacoustic cell, and are respectively aligned with the two ends of the...
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Abstract
The invention discloses a differential type resonant photoacoustic cell for gas photoacoustic spectrometry detection. A device includes a to-be-detected gas chamber used for introducing to-be-detectedgas needing to be detected; and the differential type resonant photoacoustic cell comprises a gas inlet, a gas outlet, the to-be-detected gas chamber, a reference gas chamber, a resonant photoacoustic cell, a light entering window, an isolation window, a light emitting window, a sound-electricity conversion module, a pre-amplification circuit and a filtering circuit. By combining differential andresonant structures, the effective isolation of the to-be-detected gas and a sound-electricity converter is realized, the long-term stability and the anti-interference performance of equipment are improved, and the measurement of trace gas to gas with the concentration of 100% can be realized; a first-order longitudinal resonance structure realizes collaborative amplification of photoacosutic signals and standing waves; the detection sensitivity of the gas is improved; and the differential type resonant photoacoustic cell is suitable for application occasions of long-term online monitoring ofelectric power and nuclear energy equipment, petrochemical raw material production process monitoring and the like.
Description
technical field [0001] The invention belongs to the technical field of characteristic gas detection in electric power equipment, in particular to a differential resonant photoacoustic cell for detecting characteristic gas by photoacoustic spectroscopy. Background technique [0002] Power transformers, GIS and other equipment used for electric power and nuclear energy will decompose and produce various gases that can reflect the nature of equipment failure and insulation aging performance; accurate detection of fault and aging characteristic gases is the key to realizing the operation status diagnosis of important substation equipment; The raw materials of basic chemical materials such as ethanol 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, CO 2 、CH 4 (metha...
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Login to View More IPC IPC(8): G01N21/01G01N21/17
Inventor 万福陈伟根杨天荷王建新王有元谭亚雄杜林李剑黄正勇王飞鹏周湶
Owner CHONGQING UNIV