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Hydroxy free radical in-situ measurement system

An in-situ measurement, free radical technology, applied in the direction of chemical reaction of materials for analysis, chemiluminescence/bioluminescence, etc., can solve the problems of interference, high manufacturing cost, and large equipment volume of hydroxyl free measurement devices, and achieve elimination Background interference, improve detection sensitivity, increase the effect of absorption optical path

Inactive Publication Date: 2018-06-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide an in-situ measurement system for hydroxyl free radicals, which is used to solve the defects of interference in existing hydroxyl free radical measurement devices, large equipment volume, high manufacturing cost, and cumbersome operation

Method used

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  • Hydroxy free radical in-situ measurement system
  • Hydroxy free radical in-situ measurement system
  • Hydroxy free radical in-situ measurement system

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Embodiment Construction

[0025] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] Such as figure 1 As shown, the hydroxyl radical in-situ measurement system of the present invention includes a light source 1, a collimated polarized light component, a photochemical reaction chamber 4, a polarized light conversion component and a detection device, wherein the light source 1 adopts a 2.8um mid-infrared distributed feedback type diode laser. The photochemical reaction chamber 4 has a cavity 401, an optical multi-pass pool 402 positioned in the cavity 401 and a magnet positioned outside the cavity 401, and a plurality of ultraviolet lamps 4011 are ringed between the optical multi-pass pool 402 and the magnet 403. The lamp 4011 is arranged on the circumference of the inner side wall of the cavity 401, and the optical multi-pass pool 402 is packaged in the photochemical reaction chamber 4, and the photochemical rea...

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Abstract

The present invention discloses a hydroxy free radical in-situ measurement system, which includes a light source, a collimation polarized light component, a photochemical reaction chamber, a polarizedlight conversion module, and a detection device. The photochemical chamber has a cavity, an optical multipass pool in the cavity, and a magnet outside the cavity. A plurality of ultraviolet lamps arecircularly arranged between the optical multipass pool and the external magnet; the photochemical reaction chamber is provided with a sample inlet tube and an exhaust pipe; the light of the light source forms collimated polarized light through the collimation polarized light component, the incident collimated polarized light is reflected by the optical multipass pool for multiple times, emergentlight is processed by the polarized light conversion module, and converted into a detection signal by the detection device. The hydroxy free radical in-situ measurement system uses infrared spectroscopy in 2.8um to avoid secondary OH free radical interference caused by HO2 free radicals and ultraviolet light sources, and avoids the competitive interference of chemical reaction in chemical methods.

Description

technical field [0001] The invention relates to the technical field of gas detection devices, in particular to an in-situ measurement system for hydroxyl radicals. Background technique [0002] Hydroxyl radical (OH) is one of the most important oxidants in the atmosphere. Its concentration level in the atmosphere can be used as an indicator of the oxidation capacity of the atmosphere, and it is also a measure of the self-cleaning ability of the local atmosphere for trace pollution gases. A very important research hotspot in the field. [0003] At present, the photochemical reaction chamber is used to simulate the real atmospheric environment to study the mechanism of atmospheric chemical reactions. Accurate measurement of hydroxyl radical concentration is very difficult due to its high reactivity, low concentration, and short lifetime. Therefore, it is of great significance to accurately measure the changes of hydroxyl radicals in the photochemical reaction chamber to prom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
CPCG01N21/76
Inventor 赵卫雄方波张为俊
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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