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OH free radical measurement calibration system by adopting fluorescence assay by gas expansion

A laser-induced fluorescence and technical measurement technology, which is applied in the field of gas expansion laser-induced fluorescence technology to measure OH radical calibration system, can solve problems such as large error in results, and achieve the effect of improving accuracy and simple acquisition system

Inactive Publication Date: 2015-05-27
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The above two methods are calculated to obtain the concentration of OH radicals, and the results have large errors.

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  • OH free radical measurement calibration system by adopting fluorescence assay by gas expansion

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Embodiment Construction

[0018] Such as figure 1 As shown, a calibration system for measuring OH radicals by gas expansion laser-induced fluorescence technology includes a broadband light source, a water vapor generation part, an OH free radical generation part and a signal collection part, and the OH free radical generation part includes Aluminum cavity 8, U-shaped air intake pipe 9, multiple reflection pool 11, quartz sleeve 10 and high-power ultraviolet lamp, have an air outlet at the bottom of the aluminum cavity 8, and the aluminum cavity 8 The interior is anodized, and the right end surface of the aluminum cavity 8 is provided with a light inlet and a light outlet, and the light inlet and the light outlet are respectively sealed with quartz windows 3, and the length of the quartz sleeve 10 is equal to The length of the aluminum cavity 8, the quartz sleeve 10 is horizontally fixed in the middle of the aluminum cavity 8, and the U-shaped air inlet pipe 9 is fixed laterally inside the aluminum cavi...

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Abstract

The invention discloses an OH free radical measurement calibration system by adopting fluorescence assay by gas expansion. The OH free radical measurement calibration system comprises a wideband light source, a water vapor generation part, an OH free radical generation part and a signal collection part, wherein the OH free radical generation part comprises an aluminum cavity, a U-shaped air inlet pipe, a multiple-reflection cell, a quartz sleeve and a high power ultraviolet lamp. The OH free radical calibration system disclosed by the invention can integrate generation and measurement of OH free radicals, and the concentration of the generated OH free radicals is measured by adopting a differential optical absorption spectroscopy (DOAS), so that the accuracy of the measured concentration of the OH free radicals is improved; the concentration of the OH free radicals is measured by adopting an optical method, the collection system is simple, and convenient and easy to operate; the wideband light source is adopted by the OH free radical calibration system disclosed by the invention, and visible light in the light source is used as an indication and adjustment light source of 308nm to solve the problem that the optical distance of the multiple-reflection cell is hard to measure due to the invisibility of 308nm.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a calibration system for measuring OH free radicals using gas expansion laser-induced fluorescence technology. Background technique [0002] OH radical is the most important oxidant in the atmosphere. It is not only an important indicator of the oxidation ability of the atmosphere, but also a measure of the self-cleaning ability of trace gases in the atmosphere. It can chemically react with most atmospheric trace gas components, affecting the lifetime of many trace gases in the troposphere. The reaction process of OH radicals can affect major environmental issues such as regional and global climate change, atmospheric oxidation levels and acid deposition. [0003] At present, there are three commonly used methods for measuring tropospheric OH radicals: fluorescence assay by gas expansion (abbreviated as FAGE), long-range differential optical absorption spect...

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Application Information

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IPC IPC(8): G01N21/64G01N21/31
Inventor 胡仁志朱国梁谢品华陈浩刘建国
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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