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Enhanced photoacoustic spectrum multi-component gas sensor device

A technology of gas sensor and photoacoustic spectroscopy, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., to achieve the effect of enhancing resonance performance

Pending Publication Date: 2022-04-29
河北卫讯电力自动化设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cylindrical photoacoustic gas chamber still has a certain upper limit for the amplification of acoustic signals, so a photoacoustic spectroscopy gas detection structure that further amplifies acoustic signals is needed, and an efficient photoacoustic spectroscopy that can detect multiple gases is urgently needed Detection device

Method used

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  • Enhanced photoacoustic spectrum multi-component gas sensor device

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Embodiment

[0015] As shown in the figure, an enhanced photoacoustic spectrum multi-component gas sensor device includes a photoacoustic cell 1, a pulse laser, a detector, an amplifier, a demodulator, an oscilloscope, and a computer. The photoacoustic cell 1 communicates with the pulse through an optical fiber line The laser is connected, and the optical fiber line is equipped with a spectrometer and an energy meter, which can split the pulsed laser emitted by the pulsed laser and monitor its energy. By controlling the pulsed laser, specific types of gas components can be analyzed.

[0016] The photoacoustic cell 1 is cylindrical. The photoacoustic cell 1 includes a first buffer cavity 11 and a second buffer cavity 12. The side of the first buffer cavity 11 is provided with an incident window 17, and the side of the second buffer cavity 12 is provided with an exit window 18. , the incident window 17 and the exit window 18 are both infrared-transmissive windows, and the infrared-transmissiv...

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Abstract

The invention discloses an enhanced photoacoustic spectrum multi-component gas sensor device, which comprises a photoacoustic cell, a pulse laser, a detector, an amplifier, a demodulator, an oscilloscope and a computer, the photoacoustic cell is communicated with the pulse laser through an optical fiber line, the optical fiber line is provided with an optical splitter and an energy meter, the photoacoustic cell is cylindrical, and the optical splitter is communicated with the oscilloscope. The photoacoustic cell comprises a first buffer chamber and a second buffer chamber, a resonant cavity is arranged between the first buffer chamber and the second buffer chamber, two ends of the resonant cavity are in cup shapes with gradually increased diameters, a microphone is arranged in the middle of the resonant cavity, and an acousto-optic filter is arranged at an inlet of the resonant cavity. According to the enhanced photoacoustic spectrum multi-component gas sensor device adopting the structure, a plurality of gas components are qualitatively and quantitatively analyzed through a photoacoustic cell structure with a higher amplification coefficient.

Description

technical field [0001] The invention relates to the field of photoacoustic spectrum trace technology, in particular to an enhanced photoacoustic spectrum multi-component gas sensor device. Background technique [0002] Photoacoustic spectroscopy is a gas detection technology based on the principle that gases selectively absorb infrared light of different wavelengths. This technology mainly uses the gas to absorb light to generate thermal expansion, and then periodically modulates the input light, so that the gas expands periodically to cause sound waves, and uses a microphone to detect sound waves to realize gas sensing. However, because the photoacoustic effect is very weak, it is difficult to detect photoacoustic signals, and the high application cost of photoacoustic spectroscopy limits the application of photoacoustic spectroscopy. The photoacoustic gas chamber with a resonant structure can amplify the photoacoustic signal by allowing the photoacoustic signal to form a ...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/01
CPCG01N21/1702G01N21/01G01N2021/1704
Inventor 张彦兵赵志伟安国庆杜振斌熊海军张彦华
Owner 河北卫讯电力自动化设备有限公司
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