LED light source-based differential optical absorption spectroscopy system for measuring concentration of glyoxal in atmosphere

A differential absorption spectrum, LED light source technology, applied in the field of optical measurement, can solve the problems of increasing scientific research cost, difficulty in operation, inability to perform fast real-time online measurement, and cumbersome pre-processing process, so as to reduce thermal energy, large return light, and avoid measurement errors. Effect
CN108931489AActive Publication Date: 2018-12-04FUDAN UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
FUDAN UNIV
Publication Date
2018-12-04

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Abstract

The invention belongs to the technical field of optical measurement and specifically relates to an LED light source-based differential optical absorption spectroscopy system for measuring concentration of glyoxal in the atmosphere. The system of the invention is composed of an LED light, a plane mirror, a main concave mirror, an optical corner reflector, a secondary mirror, a fiber, a spectrometerand a computer, etc. A virtual image generated by the LED light in the plane mirror is positioned near the focus of the main concave mirror; after collimation by the main concave mirror, light beamsenter the atmosphere and reach the optical corner reflector after transmitted for some distance; the light beams are reflected back to the main concave mirror along the original path and are gatheredto the fiber after focusing by the secondary mirror; after light splitting by a spectrometer and photoelectric conversion, absorption spectrum information is obtained; by the least square method for spectral interpretation, the calibrated NO2 standard absorption spectrum is used as a fitting item for inversion of glyoxal to reduce the interference of NO2 with analysis of glyoxal, thereby achievingaccurate measurement of concentration of glyoxal in the atmosphere.
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Description

technical field

[0001] The invention belongs to the technical field of optical measurement, in particular to a differential absorption spectrum system for measuring the concentration of glyoxal in the atmosphere. Background technique

[0002] Glyoxal is the smallest ฮฑ-dicarbonyl substance present in the atmosphere. It mainly comes from the direct emission of biomass combustion and the oxidation reaction of volatile organic compounds (VOCs) with OH radicals. The oxidation process is also accompanied by the generation of ozone. . The species has an atmospheric lifetime of only a few hours and is subsequently removed by oxidation with OH radicals and heterogeneous reactions on the aerosol surface, so this species is extremely important for the study of atmospheric oxidation and secondary organic aerosol formation .

[0003] The measurement of this substance mainly focuses on chromatography, mass spectrometry, and spectroscopic techniques, among which gas phase and liquid chro...

Claims

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