Gas normal pressure sampling device suitable for vehicle-mounted measurement

Abstract

The invention relates to a gas normal pressure sampling device suitable for vehicle-mounted measurement. The gas normal pressure sampling device is characterized by comprising a sampling outer pipe, a gas sampling pipe, a pressure sensor, a stepping motor and two porous plates, wherein the sampling outer pipe consists of a thin pipe and a thick pipe which are integrally arranged; the thin pipe and the thick pipe are connected by adopting a diffuse type structure; a branch pipe which extends downwards is arranged on a side wall of the thick pipe; one end of the gas sampling pipe penetrates through the branch pipe and is communicated with an inner cavity of the thick pipe; the other end of the gas sampling pipe is connected with a first end of a three-way joint, a second end of the three-way joint is connected with a sampling header pipe of a gas concentration detection instrument, and a third end of the three-way joint is connected with the pressure sensor; the pressure sensor is electrically connected with the stepping motor; the stepping motor is fixed on the porous plate positioned on the outer side, and a rotating shaft of the stepping motor penetrates through the porous plate positioned on the outer side and is rotationally connected with the porous plate positioned on the inner side. The gas normal pressure sampling device can be widely applied to gas sampling during aerial survey.

Description

technical field [0001] The invention relates to a gas normal pressure sampling device, in particular to a gas normal pressure sampling device suitable for airborne measurement. Background technique [0002] In recent years, people's attention to environmental quality has increased year by year, and the research on air pollution has also received more attention from scholars. A large number of observations and studies have been conducted on air pollution at home and abroad, and the results show that the concentration distribution of air pollutants is not only directly related to the distribution characteristics and strength of pollution sources, but also inseparable from meteorological conditions. Local air pollution is related to the local atmospheric boundary layer conditions under different meteorological conditions. For example, turbulence changes in the vertical direction will affect the temporal and spatial distribution of pollutant concentrations. To carry out regiona...

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Problems solved by technology

There are two problems in high-altitude offline sampling: 1) The time resolution is low, which makes it difficult to meet the needs of real-time monitoring; 2) The transportation process will have an uncertain impact on the sampled samples

Although high-altitude online sampling can improve the time resolution and prevent samples from being disturbed during storage and transportation, since sampling is usually carried out at an altitude of hundreds or even thousands of meters, the collected gas pressure will change with the flight status. If the atmospheric sampling is carried out directly, there will be the following problems: 1) The sampling pressure of the sample will change with the flight state, which will bring inconvenience to the quantification of the gas concentration; 2) When the flow rate of the external gas is too low, the sampling volume may not meet the requirements of the gas concentration. Concentration detection instrument requirements, thus affecting the observation results

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