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

Active Publication Date: 2018-12-04
FUDAN UNIV
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Problems solved by technology

[0003] The measurement of this substance mainly focuses on chromatography, mass spectrometry, and spectroscopic techniques, among which gas phase and liquid chromatography are relatively cumbersome for the pretreatment process of samples, and cannot be measured quickly and in real time; mass spectrometry requires mechanical vacuum and high voltage power supply, et

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

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Embodiment Construction

[0019] Such as figure 1 The LED lamp 1 and the radiator 2 involved in the present invention are given. The radiator 2 is cylindrical in shape, its upper and lower end surfaces are polished, and threaded holes are drilled to fix the LED lamp 1, and a heat-conducting coating is applied between the two. Silicone grease; there are many V-shaped grooves on the side of the radiator 2, which are distributed circularly along the central axis of the cylinder; the side is drilled near the upper end surface with a threaded hole 16 for fixing the rod. figure 2 The shown support rod 14 fixes the entire system on the horizontal translation platform 3; the horizontal translation platform 3 is also equipped with a fan 13, and is fixed on the optical path base plate 15 of the telescope. The radiator 2 and the fan 13 can effectively dissipate the heat generated by the LED lamp to ensure the stable operation of the LED lamp.

[0020] After ensuring that the LED lamp works stably, according to ...

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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.

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 α-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...

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 周斌王珊珊郭艳林
Owner FUDAN UNIV
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