Gas sensitive element and gas sensitive sensor for monitoring dangerous goods in public traffic safety

Abstract

The invention discloses a gas sensitive element and a gas sensitive sensor for monitoring dangerous goods in public traffic safety, wherein the gas sensitive element comprises an insulating base and a non-metal dustproof cover, wherein the non-metal dustproof cover is internally provided with a heating element and a sensitive material piece which are respectively welded on the insulating base; a loop of the gas sensitive element is formed by the heating element, and another loop of the gas sensitive element is formed by connecting the sensitive material piece and a matched resistor in series; the sensitive material piece comprises a semiconductor oxide layer, and metal simple substance quantum dots or metal composite quantum dots are additionally arranged in the semiconductor oxide layer in a modifying or doping way; the gas sensitive sensor comprises a shell which is provided with an air inlet; the shell is internally provided with the gas sensitive element, a signal processor and a power module; the gas sensitive element is arranged at the air inlet; the shell is provided with a display device; an output end of the signal processor is connected with the display device.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a gas sensor and a gas sensor for monitoring dangerous goods in public traffic safety. Background technique [0002] In recent years, with the continuous growth of the national economy and the large-scale development of urbanization, public transportation such as airplanes, trains, ferries, subways, and buses has developed rapidly. As public transportation serving the public, safety must be regarded as the top priority. However, so far, there are still many potential safety hazards in public transportation, and public transportation safety incidents occur frequently at home and abroad. Among them, the incidents caused by toxic, harmful, flammable and explosive dangerous goods have attracted the most attention, such as the sarin gas incident that shocked the world in the Tokyo subway in 1995, and the TNT explosive explosion in the Moscow subway in 2004. Explosions, the bus g...

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods for detecting toxic, harmful, flammable and explosive dangerous goods include police dogs, X-ray imaging technology, gas chromatography, liquid chromatography, mass spectrometry, infrared radiation, traditional gas sensors, etc. However, these methods are all has certain limitations

Equipment such as chromatography and mass spectrometry: First, the selectivity and sensitivity are poor, and dangerous goods cannot be detected and monitored well; second, the cost is high, which is not conducive to the popularization and use of detection equipment; third, the detection time is long, which seriously hinders The normal operation of public transportation; Fourth, the large size of the equipment is not conducive to practical application

The traditional gas sensor is mainly used to detect gas or volatile liquid, but dangerous goods such as solid or non-volatile liquid, which are toxic, harmful, flammable and explosive, cannot be effectively monitored.

It is these shortcomings that seriously limit the use of these products in public transportation safety detection and cannot meet actual needs

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