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Method and device for realizing interference determination and non-interference measurement of oh radical measurement

An implementation method and technology of free radicals, applied in measurement devices, material excitation analysis, fluorescence/phosphorescence, etc., can solve the problem of determining and eliminating unknown interference of OH radicals, and achieve accurate measurement without interference, avoid gas circulation, avoid Effects of propane residues

Active Publication Date: 2022-07-01
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the existing laser-induced fluorescence technology has not been able to effectively determine and eliminate the unknown interference in the measurement process of OH radicals

Method used

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  • Method and device for realizing interference determination and non-interference measurement of oh radical measurement
  • Method and device for realizing interference determination and non-interference measurement of oh radical measurement

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Embodiment Construction

[0039] Below in conjunction with the accompanying drawings, the present invention is further described by means of embodiments, but the scope of the present invention is not limited in any way.

[0040] In the specific implementation of the present invention, a chemical titration device suitable for OH radical external observation interference determination is developed on the basis of the existing Peking University Laser Induced Fluorescence System (PKU-LIF) instrument. like figure 1 and 2 As shown, the main body of the chemical titration device based on the laser-induced fluorescence technology to realize the interference determination of OH radical measurement includes two parts: the chemical titration reactor module and the gas distribution control system module. The chemical titration reactor part includes: 1-1, Teflon cylindrical flow tube; 1-2, 1 / 16 inch inner diameter stainless steel tube injection needle; 1-3, 1 / 8 turn 1 / 16 inch stainless steel union; 1- 4, the inne...

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Abstract

The invention discloses a method and device for realizing interference determination and interference-free measurement of OH radical measurement, a spectral modulation measurement method based on laser-induced fluorescence technology, an expansion of a chemical zero point measurement method based on chemical modulation, and a design and development suitable for OH radicals. A chemical titration device for external field observation interference determination. The chemical titration device includes a chemical titration reactor and a gas distribution control system. By separating the OH radicals in the real atmosphere and the OH radicals generated in the low-pressure fluorescence cavity of the laser-induced fluorescence system, OH radicals are realized. Determination of free radical interference and its interference-free measurement. The method of the invention can effectively avoid the gas circulation in the flow tube and reduce the wall loss, and realize the interference-free and precise measurement of OH radicals; the device is small in size, easy to install and disassemble, and can perform spectral modulation measurement and chemical modulation measurement conversion at any time. And the time resolution is high, the sensitivity is high, the stability is high, the cost is low, and the operation and maintenance are simple.

Description

technical field [0001] The invention belongs to the technical field of air quality measurement, relates to the precise measurement of OH radicals in the atmosphere, and in particular relates to a method and a device for realizing OH radical interference determination and interference-free measurement. Based on this, the chemical titration method and device can be used to determine the unknown measurement interference of OH radicals. Background technique [0002] OH radical is the most important oxidant in the atmosphere, which determines the chemical lifetime of most trace gases and the photo-oxidative generation of secondary pollutants. It is known as the "cleaner" of the atmosphere. Due to the extremely low concentration of OH radicals, high reactivity, and extremely short atmospheric lifetime, it is very difficult to accurately measure the external field on-line. Existing OH radical measurement techniques mainly include long optical path differential absorption spectrosc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N21/01
CPCG01N21/6402G01N21/01
Inventor 陆克定马雪飞谭照峰陈肖睿张远航
Owner PEKING UNIV