Chemical gas trace detector

Abstract

The invention discloses a chemical gas trace detector, which includes a gas inlet, a gas outlet, a first gas pump, a solenoid valve group, a gas flow detector, a filter tube, a second gas pump, a pressure detector, an ion drift spectrum detection unit, and a central processing unit. An ammonia salt assembly is set to release an ammonia dopant, the interference of interfering gases in air can be reduced, the measurement accuracy can be improved, and the problem of a high misjudgment rate of the ion drift spectrum instrument in the prior art can be solved. A tritium source is adopted as an ionization source, the molecule ionization efficiency for a to-be-detected gas is higher, processing after the ionization source is discarded is more convenient, and radioactive pollution is not caused.

Description

technical field [0001] The invention relates to the technical field of analytical instruments and detection, and more specifically, to a chemical gas trace detector. Background technique [0002] Ion mobility spectrometry (IMS) was originally developed as an analytical technique in chemical laboratories. In recent years, this technology has been perfected and has been applied in many fields, including the monitoring of chemical warfare agents in the national military field, the monitoring of explosives in security departments at all levels, and the inspection of prohibited items such as drugs and narcotics by customs and airport entrance security inspection departments. monitoring and the monitoring of toxic and harmful gases by the environmental monitoring department. With the widening of the application range, IMS technology has aroused the research interest of experts from all over the world, so this technology has been continuously updated and developed. [0003] Altho...

AI Technical Summary

Problems solved by technology

[0004] 1. Ion drift spectrometers basically use radioactive sources, the conventional one is Ni 63 , when the instrument is eliminated or scrapped, it is difficult and expensive to deal with the radioactive source;

[0005] 2. The substance concentration measurement range of the existing instrument is ppm, and the sensitivity is low

[0006] 3. The false alarm rate of existing instruments is high, about 30%

[0007] 4. The replacement rate of the consumables of the existing instruments is high and cumbersome, and it needs to be shut down when replacing the consumables of the accessories

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