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Apparatus and method for measurement of trace gas with photoacoustic spectroscopy technology

A technology for technical measurement and trace gas, which is applied in the field of devices for measuring trace gases using photoacoustic spectroscopy, which can solve problems such as window and cell wall noise, improve detection signal-to-noise ratio, improve detection limit, and weaken correlation. effect of noise

Inactive Publication Date: 2016-01-13
ANHUI WAYEE SCI & TECH CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to provide a device and method for measuring trace gas using photoacoustic spectroscopy to solve the problem of noise generated by the absorption of windows and cell walls in the prior art gas concentration measurement device based on photoacoustic cells

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  • Apparatus and method for measurement of trace gas with photoacoustic spectroscopy technology
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  • Apparatus and method for measurement of trace gas with photoacoustic spectroscopy technology

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Embodiment Construction

[0020] Such as figure 1 , Figure 4 As shown, a device using photoacoustic spectroscopy to measure trace gases includes a light source, a photoacoustic cell, a chopper, a preamplifier, a lock-in amplifier, a digital signal processing unit, an optical power meter, and a photoacoustic cell. The inner cavity is composed of buffer gas chambers 1 and 2 located at the front and rear ends of the photoacoustic cell, and a first-order longitudinal resonant cavity 3 that is coaxial with the photoacoustic cell and connected to the two buffer gas chambers. The wall of the photoacoustic cell corresponds to the front of the resonant cavity 3 The side is provided with an air inlet 4 communicating with the front buffer air chamber 1, and the rear side of the photoacoustic pool corresponding to the resonant cavity 3 is provided with an air outlet 5 communicating with the rear end buffer air chamber 2, and the photoacoustic pool wall is also provided with a For the sound holes 6 and 7 that are...

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Abstract

The invention discloses an apparatus and method for measurement of trace gas with photoacoustic spectroscopy technology. On the basis of the first-order longitudinal resonance photoacoustic spectroscopy technology, a differential photoacoustic signal method is utilized to significantly weaken the influence of correlated noise caused by photoacoustic effect in solid and improve the detection signal-to-noise ratio of a photoacoustic signal. Compared with existing photoacoustic spectroscopy detection methods, the method provided by the invention further improves the detection limit of trace gas.

Description

technical field [0001] The invention relates to the field of gas concentration measurement systems, in particular to a device and method for measuring trace gases using photoacoustic spectroscopy. Background technique [0002] Spectral detection technology is divided into emission spectroscopy technology and absorption spectroscopy technology. Photoacoustic spectroscopy (photo-acoustic spectroscopy), like differential absorption spectroscopy (DOAS), belongs to absorption spectroscopy technology and is a kind of indirect absorption spectroscopy technology. Photoacoustic spectroscopy, characterized by high sensitivity and selectivity, is an important limit detection method. [0003] The basic principle of photoacoustic spectroscopy technology is based on the photoacoustic effect, that is, when a beam of light close to the absorption frequency of the gas to be measured intermittently irradiates the gas in a closed container, there will be sound waves in the container. This phen...

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Application Information

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IPC IPC(8): G01N21/17G01N21/25
Inventor 刘洋
Owner ANHUI WAYEE SCI & TECH CO LTD
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