High-precision nitrogen oxide and sulfur dioxide detection instrument

Abstract

The invention provides a high-precision nitrogen oxide and sulfur dioxide monitoring instrument, which is characterized in that background gas and to-be-detected gas are respectively pumped into a cavity of a long-optical-path absorption cell in sequence through a gas pump, a deuterium lamp light source is driven to emit ultraviolet light, and gas sample molecules and ultraviolet light beams interact in the long-optical-path absorption cell; the ultraviolet light beam is then split by using a spectrograph, converting an optical signal into an electric signal to be sent into a control and processing unit; and the NO concentration and SO2 concentration in the gas to be detected are calculated by the control and processing unit according to the established absorbance-concentration relationship model. The detection instrument has the advantages of good applicability, high resolution, low cost, no pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of toxic and harmful gas monitoring, and in particular relates to a high-precision nitrogen oxide and sulfur dioxide detection instrument. Background technique [0002] Nitrogen oxides and sulfur dioxide are the main pollutants in the atmosphere, and they are important indicators to measure whether the atmosphere is polluted. [0003] At present, SO in the atmospheric environment is applied 2 , NO x The monitoring methods mainly use electrochemical, ion chromatography, mass spectrometry and other methods for measurement. However, the above method has many problems such as large volume and weight, low measurement accuracy, short service life, long recovery time, poor overload capacity, greater impact of the instrument on the environment, and difficulty in adapting to harsh testing environments. [0004] The spectroscopic analysis method has many advantages such as high sensitivity, fast response, stability...

AI Technical Summary

Problems solved by technology

However, the chemiluminescence method also has some fatal defects, such as the strong dependence of the instrument on temperature, etc. For example, the sulfide and nitrogen oxide analyzers in automatic weather stations must rely on air conditioning to maintain a constant temperature to work normally, and the volume and weight are large, which is not conducive to portability.

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