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Laser-induced fluorescence-based multichannel nitric oxide on-line monitoring system

A laser-induced fluorescence and nitrogen oxide technology, applied in the field of environmental quality detection, can solve problems such as rapid changes over time, large nitrogen oxide concentration levels, short atmospheric life, etc., and achieve the effect of small interference, stable and accurate monitoring

Inactive Publication Date: 2016-12-21
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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Problems solved by technology

[0003] However, due to the large span of nitrogen oxide concentration levels (from 10ppm in remote background areas to 1ppm in urban background areas), the short life of the atmosphere, rapid changes with time, and the measurement is easily interfered by other nitrogen oxides, which increases the concentration of nitrogen oxides. Measuring Difficulty

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0023] Such as figure 1 and figure 2 As shown, the multi-channel nitrogen oxide online monitoring system based on laser-induced fluorescence includes:

[0024] The automatic sampling control unit sends the air to be monitored (such as zero air, NO 2 Calibration gas or air sample), the flow sensor accurately and stably controls the delivery gas through the gas mass flow meter;

[0025] The pyrolysis laser-induced flu...

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Abstract

The invention relates to the field of environmental quality detection, in particular to a laser-induced fluorescence-based multichannel nitric oxide on-line monitoring system. The nitric oxide on-line monitoring system monitors the concentration of nitric oxide in the atmosphere on line through a TD-LIF (Thermal Decomposition Laser-Induced Fluorescence instrument); NO2 generated by decomposition of different nitric oxide components (NOy) at different temperatures can be directly detected at 532 nm through an LIF spectrum. The monitoring system disclosed by the invention is high in sensitivity, quick in time response and low in interference, is precise and stable, and has an important significance for the technical field of nitric oxide measurement.

Description

technical field [0001] The invention specifically relates to the field of environmental quality detection, in particular to a multi-channel nitrogen oxide online monitoring system based on laser-induced fluorescence. Background technique [0002] Nitrogen oxides play an important role in the formation of haze as well as photochemical smog. NO 2 Ozone can be formed with VOCs under the condition of atmospheric light, and NO 2 It can also form peroxyacetyl nitrates (PANs) and organic nitrates (ANs) with certain VOCs in the atmosphere. These secondary products are the main components of photochemical smog. At the same time, NO 2 It will also react with OH- radicals in the atmosphere to form nitric acid gas, which can be further converted into nitrate particles; at the same time, NO 2 It will also form secondary organic aerosols with some VOCs, they are all PM 2.5 important parts of. As one of the major urban air pollutants, nitrogen oxides participate in chemical reactions...

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 马社霞孙家仁邹维欢吕延山
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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