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Concentration quantification method of broadband cavity strengthening type atmosphere NO2 detection system

A detection system, enhanced technology, applied in the direction of color/spectral characteristic measurement, etc., to avoid quantitative errors, simplify the operation process, and ensure the effect of accurate measurement

Active Publication Date: 2014-04-30
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve these problems that the existing concentration quantitative method of broadband cavity enhanced absorption spectroscopy needs to regularly calibrate the emissivity of the lens, and the concentration quantitative result is affected by the calibration result of the reflectivity of the lens. Calibrated Broadband Cavity Enhanced Atmospheric NO 2 Concentration quantification method for detection system

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  • Concentration quantification method of broadband cavity strengthening type atmosphere NO2 detection system
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  • Concentration quantification method of broadband cavity strengthening type atmosphere NO2 detection system

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Embodiment Construction

[0019] In this embodiment, broadband cavity enhanced atmospheric NO 2 The detection system is equivalent to a long optical path differential absorption spectroscopy (DOAS) detection system, using the oxygen dimer (O 2 -O 2 ) content is stable to obtain the absorption optical path of the detection system, and then according to the DOAS fitting technology to obtain the atmospheric NO 2 Column concentration, and then quantify atmospheric NO 2 molecular concentration.

[0020] Such as figure 1 As shown, this embodiment broadband cavity enhanced atmospheric NO 2 The concentration quantification method of the detection system has eight steps in total, that is, step 1 to step 8. In step 1, the function L eff (λ) The length d of the optical resonant cavity in the expression can be measured by a meter ruler; the mirror reflectivity R (λ) uses the factory nominal value; the atmospheric Rayleigh scattering coefficient α Ray (λ) is determined by the extinction of 78% nitrogen and 2...

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Abstract

The invention discloses a concentration quantification method of a broadband cavity strengthening type atmosphere NO2 detection system. The detection system is equivalent to a light optical path difference absorption spectrum (DOAS) detection system, the characteristic of the stable oxygen dipolymer content in atmosphere is utilized to obtain a light-absorbing optical path of the detection system, and the size of the concentration of the atmosphere NO2 is quantified. The quantification method comprises the following steps: determining an effective optical path function; selecting a measuring wave band, and calculating an effective optical path of an oxygen dipolymer absorption peak wavelength; calculating a correction factor of a gas absorption cross section, and correcting the absorption cross section of the gas; calculating the optical thickness to obtain the concentration of a gas pillar by virtue of DOAS matching; calculating the absorption optical path, and calculating the concentration of the atmosphere NO2. Compared with the existing method, the concentration quantification method provided by the invention has the advantages that the reflectivity of a lens is not needed to be calibrated, the operation process of the detection system is simplified, and the influence of a calibration error of the reflectivity of the lens on the quantification result is avoided.

Description

technical field [0001] The invention relates to a method for quantifying the concentration of atmospheric trace gases based on optical measurement, more particularly to a broadband cavity enhanced atmospheric trace gas NO 2 Concentration quantification methods for detection systems. Background technique [0002] Atmospheric NO 2 The content is in the range of sub ppbv to hundreds of ppbv, to measure NO in the atmosphere 2 content, it is necessary to require measurement techniques with high sensitivity. Broadband cavity-enhanced absorption spectroscopy technology is a highly sensitive optical measurement method, which uses an optical resonant cavity composed of high-reflectivity mirrors to increase the absorption optical path, thereby improving detection sensitivity. Then according to the fingerprint absorption characteristics of the gas, the gas components with extremely low concentration can be identified. At present, the technology has realized the NO 2 Highly sensiti...

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Application Information

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IPC IPC(8): G01N21/31
Inventor 凌六一黄友锐唐超礼韩涛曲立国陈珍萍徐善永
Owner ANHUI UNIV OF SCI & TECH
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