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Method for improving sensitivity for detecting NO3 in atmosphere by deducting vapor interference

A sensitivity, water vapor density technology, applied in the direction of color/spectral characteristic measurement

Inactive Publication Date: 2015-12-16
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0003] The object of the invention is to provide a method to improve the detection of atmospheric NO by deducting water vapor interference. 3 Sensitivity approach to address atmospheric NO measured by prior art IBBCEAS techniques 3 Problems in the method of subtracting water vapor absorption interference in

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  • Method for improving sensitivity for detecting NO3 in atmosphere by deducting vapor interference
  • Method for improving sensitivity for detecting NO3 in atmosphere by deducting vapor interference
  • Method for improving sensitivity for detecting NO3 in atmosphere by deducting vapor interference

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Embodiment Construction

[0048] Such as figure 1 As shown, the present embodiment improves the IBBCEAS technology to detect atmospheric NO by deducting water vapor interference. 3 There are 10 steps in the method of sensitivity, that is, step 1 to step 10.

[0049] In step 1, nitrogen (purity is 99.999%) is charged in the cavity of the optical cavity, and the spectral signal output by the optical cavity is recorded with a spectrometer to obtain I 0 (λ); the actual atmosphere is pumped into the optical resonant cavity, and the spectral signal output by the optical resonant cavity is recorded with a spectrometer to obtain I(λ). When calibrating the reflectivity curve R(λ) of the lens, the cavity is filled with nitrogen and helium with a purity of 99.999% respectively, and the R(λ) and R( λ) is specifically calculated by formula (1):

[0050] R ( λ ) = 1 - I ...

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Abstract

The invention discloses a method for improving the sensitivity for detecting NO3 in the atmosphere by deducting vapor interference. The method comprises the following steps: measuring a spectrum, and demarcating a lens reflectivity; calculating the Rayleigh scattering extinction of nitrogen; calculating a high-resolution vapor absorption cross section; facilitating high resolution of the measured spectrum, the lens reflectivity and the nitrogen Rayleigh scattering extinction; measuring the concentration of vapor in a cavity; calculating a high-resolution vapor absorption spectrum; calculating a low-resolution vapor absorption spectrum; calculating a low-resolution vapor absorption cross section; fitting the spectrum; and judging whether the iteration is ended or not. The vapor absorption cross section is calculated in real time according to the pressure and temperature in an IBBCEAS (incoherent broad-band cavity-enhanced absorption spectroscopy) optical resonant cavity, and the real vapor absorption cross section is gradually obtained by adopting an iteration calculation method, so that a vapor absorption structure can be effectively deducted from the absorption spectrum in the subsequent spectrum inversion. Compared with an existing method, the sensitivity of the IBBCEAS technology for detecting the NO3 in the atmosphere can be greatly improved.

Description

technical field [0001] The invention relates to the field of methods for improving the sensitivity of gas detection by absorption spectroscopy, in particular to a method for improving the detection of atmospheric NO by deducting water vapor interference. 3 sensitivity method. Background technique [0002] NO 3 It is an important trace gas in the atmosphere, and it is a key species and oxidant in the nocturnal chemistry of the troposphere. It monitors atmospheric NO 3 Concentrations are critical to the study of atmospheric chemistry. NO 3 The volume mixing ratio in the atmosphere is usually in the range of several pptv to hundreds of pptv, which requires atmospheric NO 3 Measurement techniques and methods must have high detection sensitivity. For absorption spectroscopy measurement technology, the direct way to obtain high detection sensitivity is to obtain long-distance absorption light path. As one of many absorption spectroscopy measurement techniques, Incoherent Bro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 凌六一黄友锐韦颖陈珍萍邢丽坤徐善永唐超礼韩涛
Owner ANHUI UNIV OF SCI & TECH
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