Gas sample inlet for atmosphere detection equipment

Abstract

The invention provides a gas sample inlet for atmosphere detection equipment. The gas sample inlet comprises a hollow casing, a shielding body and a tube, wherein a top opening and a bottom opening are formed in the hollow casing, the shielding body is inlaid in the hollow casing and stretches across a light path between the top opening and the bottom opening, one end of the tube is connected with the top opening in the hollow casing, and the other end is connected with an optical detector of the atmosphere detection equipment. The gas sample inlet is lightproof, rainproof and insect-proof, and the gas detection accuracy is improved.

Description

technical field [0001] The invention belongs to the field of atmospheric measurement, in particular to a gas sampling port used for atmospheric detection equipment. Background technique [0002] At present, the methods for measuring the mass concentration of atmospheric particulate matter at home and abroad mainly include the off-line filter membrane weighing method, the on-line β-ray method and the micro-oscillating balance method, etc. The filter membrane weighing method is currently an internationally recognized benchmark method for detecting the mass concentration of atmospheric particulate matter, but its disadvantages are time-consuming, labor-intensive, and poor timeliness. The β-ray method and the micro-oscillating balance method can be monitored automatically in real time. The disadvantages are high production costs and large equipment volume, which are not suitable for outdoor flow measurement and dense distribution. Light-scattering particle sensors based on Mie ...

AI Technical Summary

Problems solved by technology

[0004] A gas sampling port in the prior art is connected to the detector through a short straight pipe. The sampling port is provided with an insect-proof net and a rainproof cap. However, the rainproof cap has a certain light-shielding effect, but the light-shielding is not complete, and because Sampling ports and pipelines do not use special light-absorbing materials, and some scattered and reflected stray light will enter the light chamber to interfere with detection

[0005] Another kind of gas sampling port in the prior art, after the gas enters the gas detection equipment through the sampling port, it reaches the detector through a long anti-light gas path, thereby eliminating stray light such as natural light from interfering with the detection of the optical sensor. However, this The air path of the gas sampling port is long, and there may be bends and corners, which may cause the loss of particulate matter in the sampled gas, thus affecting the detection accuracy

Images