Ion sensor based on FAIMS principle

Abstract

The embodiment of the invention provides an ion sensor based on an FAIMS principle. The ion sensor comprises a corona ionization chamber, an ion screening channel and an ion detection part which are connected in sequence. The corona ionization chamber comprises an ionization chamber shell, a corona ionization source and an air inlet, and the corona ionization source provides a preset negative highvoltage to ionize the sample. The ion screening channel comprises a screening passage outer wall, an internal columnar electrode and a passage formed between the outer wall and the electrode, and thepassage is used for ion screening. The ion detection part comprises a deflection electrode and an ion detection plate, an air outlet is formed between a deflection electrode ring and the ion detection plate and is used for allowing air flowing into the corona ionization chamber to flow out, and a deflection electric field is arranged between the deflection electrode and the ion detection plate and used for allowing ions to be detected to reach the ion detection plate. The ionization source is a non-radioactive ionization source and does not generate radioactive radiation; the ion sensor has the advantage of being capable of working normally in the normal-temperature and normal-pressure external environment, and can be suitable for various working environments.

Description

technical field [0001] The invention relates to the field of sensors, in particular to an ion sensor based on the FAIMS principle. Background technique [0002] With the continuous development of explosives and narcotics detection equipment based on IMS (Ion mobility spectroscopy) and FAIMS (High-field Asymmetric Waveform Ion Mobility Spectrometry) technology, the volume of equipment, The impact on human health and the speed of detection have higher and higher requirements. Requirements such as small size, high efficiency, and no pollution have gradually become the targets that new testing equipment needs to pay attention to. [0003] At present, most of the explosive detection equipment on the market adopts the method of ionizing the sample with an artificial radioactive ion source first and then detecting it. But this method has a serious disadvantage, that is, the ion source it uses is an artificial radioactive isotope. First of all, if the operation process is imprope...

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Problems solved by technology

But this method has a serious disadvantage, that is, the ion source it uses is an artificial radioactive isotope

First of all, if the operation process is improper, the artificial radioactive ion source has a certain radioactive risk to the human body; secondly, due to the possibility of harm to the human body, the procedures for purchasing, storing, selling, and discarding the artificial radioactive ion source are very complicated, and the cost of implementation also very high

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