A Differential Resonant Photoacoustic Cell to Improve the Stability of Gas Photoacoustic Spectroscopy
A resonant photoacoustic cell and photoacoustic spectroscopy technology, which is applied in the direction of material analysis, measuring devices, and analytical materials through optical means, can solve the problems of inability to measure high-concentration gas to be measured, poor anti-interference ability, and poor stability.
Active Publication Date: 2021-06-08
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] The following examples are further illustrated by the following examples.
[0025] figure 1 A schematic structural diagram of a differential resonant spectroscopy for gas photonic spectrum detection in accordance with one embodiment of the present invention is shown. Such as figure 1 As shown, the differential resonance photocochrum includes a gas chamber 1, a reference gas chamber 2, a resonant photovoltaic pool 3, a light window 4 and 4 ', isolation window 5 and 5', outlet window 6 and 6 ' , Sound electrical conversion module 7, front amplifier circuit and filter circuit 8.
[0026] In one embodiment, the cross-sectional shape of the differential resonance photocoyer pool is "two" shaped. The gas chamber 1 and the reference gas chamber 2 are symmetrically disposed on both sides of the central axis of the differential resonance photoconograph and aligned with both ends of the resonant photovoltaic pool 3, respectively. The gas chamber 1 includes an inlet 11 and an air ope...
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Abstract
A differential resonant photoacoustic cell for gas photoacoustic spectrometry detection, the device includes a gas chamber to be tested, which is used to pass through the gas to be detected; the differential resonant photoacoustic cell includes: an air inlet, Gas outlet, gas chamber to be tested, reference gas chamber, resonant photoacoustic cell, light inlet window, isolation window, light outlet window, acoustic-electric conversion module, preamplifier circuit and filter circuit. The invention realizes the effective isolation between the gas to be measured and the acoustic-electric converter through the combination of differential and resonance structures, improves the long-term stability and anti-interference performance of the equipment, and can realize the measurement of trace gas to 100% concentration gas, the first order The longitudinal resonance structure realizes the coordinated amplification of photoacoustic signal standing waves and improves the detection sensitivity of gases. It is suitable for long-term on-line monitoring of electric power and nuclear energy equipment, petrochemical raw material production process monitoring and other applications.
Description
Technical field [0001] The present invention belongs to the field of feature gas detection techniques in a power apparatus, and more particularly to a differential resonant photovoltaic pool using a photonic sound spectroscopy. Background technique [0002] For electricity, nuclear power transformers, GIS and other devices can decompose a gas that produces a variety of gas that can react to fault properties and insulation agents; accurately detect failures and aging feature gases, is the key to realization of important substation equipment operating state diagnosis; The raw materials of basic chemical materials and fine chemical products such as ethanol are mainly natural gas, accurately monitoring the gas components and content in the production process, and is the core of the quality of the above chemical products. Real-time accurate detection of CO, CO 2 CH 4 (Methane), C 2 Hide 4 (Ethylene), C 2 Hide 6 (Ethane), C 2 Hide 2 (Acetylene), H 2 SO 2 Fly 2 (DFC), CF 4 (Tetrafluorid...
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IPC IPC(8): G01N21/01G01N21/17
Inventor 万福陈伟根杨天荷陈淼王建新黄政伟王有元姜德涛谭亚雄杜林李剑黄正勇王飞鹏周湶
Owner CHONGQING UNIV