Detection system for IMS (Ion Mobility Spectrometry) explosives

Abstract

The invention belongs to the technical field of dangerous substance detection and particularly relates to a detection system for trace substance explosives. According to the technical scheme, the detection system for IMS (Ion Mobility Spectrometry) explosives comprises a sampling device (1), a gas inlet heater (2), an outer recycle gas channel (30), an inner recycle gas channel (40), a sensor (50), a power module (6), an amplifier (7), a single-chip microcomputer control system (8), a high-pressure module (9) and a drift tube (10). According to an ion separation technology provided by the invention, sample molecules can generate corresponding product ions under the action of an ionization source in the drift tube (10); the product ions are decelerated due to the acceleration of an electric field and the collision of neutral atmospheric molecules to obtain constant average speeds; the charge-mass ratios, space geometrical configuration and collision cross sections of the different product ions are different, so that the obtained average speeds are also different, and the product ions are separated after passing through a section of electric field and can reach a collecting electrode successively so as to complete the whole detection process.

Description

technical field [0001] The invention belongs to the technical field of dangerous substance detection, and in particular relates to a detection system for trace substances and explosives. Background technique [0002] As aircraft bombs, hijacking and terrorist threats continue to grow in intensity and variety, the development of instruments to detect concealed explosives and weapons is becoming increasingly critical. In the civilian field, the detection of explosives and other threatening objects is also very necessary, for example, banks, public buildings. The requirements for explosive detectors are high sensitivity, low false alarm rate, compact structure, and easy operation. [0003] The explosives used in non-military applications mainly include NG, TNT or other polynitro compounds. [0004] Various technical methods of detecting explosives exist today. Among them: marking explosives with radioactive tracers. Another technique is to use sensitive electron capture sen...

AI Technical Summary

Problems solved by technology

Separation by gas chromatography first can improve the resolution of the instrument by two orders of magnitude, however, it also prolongs the response time

The combination of mass spectrometry and chromatography is only superior to the use of chromatography alone, but it increases the cost of the instrument and the operation process.

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