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Substance identification method of ion mobility spectrum (IMS) detection instrument based on ion diagram sequence

A technology of ion mobility spectrometry and identification method, which is applied in the field of trace substance detection, can solve the problems of misleading and false alarms of inspectors who use the instrument, and achieves the effect of low false alarm rate and strong resolution ability.

Active Publication Date: 2011-06-29
NUCTECH CO LTD
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Problems solved by technology

[0008] A common deficiency of the substance identification method in the general IMS detector data processing system is that the peak position information is only extracted from a preprocessed ion map for substance identification, but in fact there are some substances, whose Within a certain period of time (usually a few seconds) after being sent to the instrument for detection, the information such as the number of peaks and peak positions will change with time. For these substances, the general substance identification method cannot only identify the ion from a pretreated ion. If the correct identification result is obtained, it will cause false alarms, which will mislead the inspectors who use the instrument.

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  • Substance identification method of ion mobility spectrum (IMS) detection instrument based on ion diagram sequence
  • Substance identification method of ion mobility spectrum (IMS) detection instrument based on ion diagram sequence
  • Substance identification method of ion mobility spectrum (IMS) detection instrument based on ion diagram sequence

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example 1

[0054] Figure 5-12 It exemplarily shows that after a mixture of 50ng bimodal substance A and 30ng unimodal substance B is fed into a portable IMS detector in a certain experiment, the process and results of this method for the continuous 8 ion maps output by the instrument are shown. Figure 5 a- Figure 12 a The 8 ion maps are given in sequence, the time interval between two adjacent ion maps is 1 second, and each ion map is obtained by averaging 10 consecutive ion maps without time intervals.

[0055] Peak-finding algorithm and environmental compensation method. The software of the instrument adopts the peak-finding algorithm based on wavelet transform, Figure 5 b- Figure 12 b is the Figure 5 a- Figure 12 The ion maps shown in a are the results obtained by wavelet transform respectively, and the material peak positions and peak heights are extracted from the ion maps after wavelet transform. The peak-finding threshold set in the software of the instrument is 60, a...

example 2

[0065] Figure 13-20 It exemplarily shows that after 50ng of bimodal substance A is injected into a portable IMS detector in a certain experiment, the processing process and results of the continuous 8 ion diagrams output by the instrument are shown by this algorithm. Figure 13 a- Figure 20 a The 8 ion maps are given in sequence, the time interval between two adjacent ion maps is 1 second, and each ion map is obtained by averaging 10 consecutive ion maps without time intervals.

[0066] Peak-finding algorithm and environmental compensation algorithm. The software of the instrument adopts the peak-finding algorithm based on wavelet transform, Figure 13 b- Figure 20 b is the Figure 13 a- Figure 20 The ion maps shown in a are the results obtained by wavelet transform respectively, and the material peak positions and peak heights are extracted from the ion maps after wavelet transform. The peak-finding threshold set in the software of the instrument is 60, and a peak i...

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Abstract

The invention discloses a substance identification method of an ion mobility spectrum (IMS) detection instrument based on an ion diagram sequence. The method comprises the following steps: 1. executing preliminary substance identification for one time on a preprocessed ion diagram by utilizing a peak-detection algorithm, and storing substances matched in substance identification at this time; 2. continuously executing step 1 at a time interval of Delta t until times of preliminary substance identification reach preset times M, wherein, M is a natural number which is greater than 2; and 3. eliminating interfering substances from the substances matched in preliminary substance identification for M times. In the invention, for certain multi-peak substances, information such as peak quantity,peak position and the like changes with time, so a false alarm is given if only based on the identification result of the preprocessed ion diagram, which causes misguidance on an inspector using the detection instrument. By utilizing the substance identification method based on the ion diagram sequence, probability of the false alarm can be lowered so as to reduce misguidance on the inspector.

Description

technical field [0001] The present invention relates to a trace substance detection technology based on ion mobility spectrometry, and more specifically, to a substance identification method based on an ion map sequence of an ion mobility spectrometer detector. Background technique [0002] Ion mobility spectrometry (IMS) detection technology is an effective chemical substance analysis method, which has been widely used in airports, docks, stations and other places for trace detection of explosives, drugs, etc., and the detection accuracy can generally reach micrograms or even nanometers. Below the gram level. The basic composition of an IMS detector is as follows: figure 1 As shown, the IMS detector is mainly composed of a migration tube, peripheral control circuits and other equipment. The migration tube is the core part of the instrument, and it is the place where the substance molecules in the sample to be detected are ionized into ions and the ions drift. The data pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N27/622
Inventor 马建湖阮明赵崑曹学光
Owner NUCTECH CO LTD
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