Multi-channel detection board, detection system and detection method for ion mobility spectrometer
An ion mobility spectrometer and multi-channel detection technology, applied in the field of multi-channel detection board, can solve the problems of small pulse current amplitude, affecting the sensitivity and resolution of the instrument, and achieve the effect of improving the accuracy rate and signal-to-noise ratio
Active Publication Date: 2017-11-24
中船重工安谱(湖北)仪器有限公司
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Problems solved by technology
However, because the ion transfer tube is difficult to achieve complete symmetry, and its internal distribution electric field is not a uniform electric field, the spectral peak of the pulsed ion current detected by a single ion detection board is very wide, and the pulse current amplitude is relatively large. Small, which will affect the sensitivity and resolution of this type of instrument
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[0051] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0052] Ion transfer tubes of general ion mobility spectrometers are attached figure 2 As shown: 1 is the air inlet, 2 is the Ni63 radiation source, 3 is the electrode sheet, 4 is the ion gate, 5 is the gas outlet, and 6 is the ion detection board. After the gas to be detected enters the reaction area from the air inlet 1, under the action of the Ni63 radiation source 2, positive ions or negative ions are formed in the reaction area; the electrode sheet 3 has a voltage and increases or decreases according to a certain gradient, thereby forming an electric field; positive ions Or negative ions migrate under the action of an electric field. When the ion gate 4 is closed, the migrating ions directly hit the ion gate, and there are no ions in the migration area at this time. When the ion gate 4 is opened, the ions migrate to the ion detection plate 6 under th...
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The invention discloses a multi-channel detection board, a detection system and a detection method for an ion mobility spectrometer, which are used to improve the resolution and sensitivity of the ion mobility spectrometer, including a multi-channel ion detection board, a current / voltage conversion module, and an AD conversion module and ancillary modules; the ion receiving surface of the multi-channel detection board has a circular receiving surface and multiple ring-shaped receiving surfaces whose radii vary according to certain rules, and the output is connected to the input end of the current / voltage conversion module; The current / voltage conversion module converts in the form of capacitance integration. The operational amplifier used is a precision switching integrator transimpedance amplifier IVC102. The output of the current / voltage conversion module is connected to the input terminal of the AD conversion module; the output of the AD conversion module is available For the subsequent digital signal processing, the AD conversion module adopts an 8-channel AD conversion chip AD7608; the auxiliary module includes a power module, a microcontroller MCU, and an audible and visual alarm; in addition, a compensation algorithm for improving sensitivity and resolution is also disclosed.
Description
technical field [0001] The invention relates to the technical field of ion mobility spectrometry, in particular to a multi-channel detection plate, detection system and detection method for ion mobility spectrometers. Background technique [0002] Ion mobility spectrometry (IMS) is a new gas phase separation and detection technology that appeared in the early 1970s. Its core idea is to distinguish different substances by the difference in ion migration time. The detection sensitivity of the instrument using ion mobility spectrometry technology is very high, and it can detect nanogram level (1ng=10-9kg) or even picogram level (1pg =10-12kg), the instrument using this technology can detect chemical warfare agents, drugs, explosives and air pollutants, etc., and has important applications in airport security inspection, battlefield investigation, environmental monitoring, industrial production, etc. [0003] In the instrument using ion mobility spectrometry technology, there i...
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IPC IPC(8): G01N27/66
Inventor 李明勇兰江尤兴志蔡庸军黄启勇
Owner 中船重工安谱(湖北)仪器有限公司