Laser-induced breakdown spectroscopy based explosive real-time remote detection method

A technology of laser-induced breakdown and detection method, applied in the field of spectral detection, can solve the problems of high false alarm rate, long analysis time, and complicated sample preparation process for detection, so as to improve the accuracy, improve the efficiency of detection, and simplify the detection. effect of the process

Inactive Publication Date: 2016-06-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the long analysis time, high false alarm rate and complex sample preparation process of these methods, these

Method used

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  • Laser-induced breakdown spectroscopy based explosive real-time remote detection method
  • Laser-induced breakdown spectroscopy based explosive real-time remote detection method
  • Laser-induced breakdown spectroscopy based explosive real-time remote detection method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0049] Example 1

[0050] Take K-means as an example to illustrate the process of using unsupervised learning to identify explosives in airport detection. Because explosives are often contaminated on suitcases, which are usually made of plastic. Therefore, the selected samples are three explosives (CL-20, RDX, HMX) and two plastics (ABS and Nylon, respectively). The specific implementation is divided into the following 3 steps.

[0051] Step 1: Collect spectrum

[0052] When collecting the LIBS spectrum, send 12 laser pulses at each place of the sample. The first two shots are used to clean the surface of the sample, so they are not used, and the last 10 shots are averaged as a spectrum. Figure . Then change to a new location to continue to obtain the LIBS spectrum of the sample. Get 50 spectra for each sample Figure , A total of 250 spectra obtained from 5 samples Figure .

[0053] The short-distance dual-pulse LIBS spectrum measurement system includes a laser 1, a pulse delay...

Example Embodiment

[0077] Example 2

[0078] Take PLS-DA as an example to illustrate the process of supervised learning for explosives identification. Select explosive TNT and 7 kinds of non-explosive ABS, HDPE, PET, PMMA, PP, PS, PVC as samples. A laser-induced breakdown spectroscopy measurement system is used to perform spectrum collection on the above samples, and 100 spectra are collected for each sample.

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Abstract

The invention relates to a laser-induced breakdown spectroscopy based explosive real-time remote detection method, belonging to the field of the spectrum detection technology. The method comprises the steps of: measuring different regions of a sample to be detected by a laser-induced breakdown spectroscopy based measurement system to obtain a spectrum; performing normalization processing to the spectral line intensity and the intensity ratio; taking the preprocessed characteristic spectral line intensity and ratio thereof as input variables, judging by a supervised learning method or a non-supervised learning method and determining whether the sample to be detected contains an explosive. According to the method, the detection efficiency is improved, the detection process is simplified, close and remote real-time detection can be realized simultaneously, a PLS-DA (partial least squares discriminant analysis) or K mean value sorting method is used to correctly judge the explosive when the processing elements constitute a substance similar to the explosive, the detection accuracy is effectively improved, and the method can be applied to airports, railway security checking and anti-terrorist and actual battlefields.

Description

technical field [0001] The invention relates to a real-time and long-distance detection method for explosives based on laser-induced breakdown spectroscopy, which belongs to the technical field of spectrum detection. Background technique [0002] High-energy explosives play an important role in the fields of military, aerospace, and infrastructure construction. With the expansion of application fields, the safety production and supervision of high-energy explosives have received more and more attention. On the other hand, with the proliferation of terrorism worldwide, there is an urgent need for a method that can detect explosives in real time at a certain safe distance in response to car bombs, mail bombs, and human bombs that threaten public safety. [0003] Anti-terrorism is a hot issue in today's world. Due to the concealment and suddenness of terrorist attacks, timely and effective early warning cannot be carried out, causing losses to people's personal and property. H...

Claims

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Application Information

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IPC IPC(8): G01N21/63G01N21/01
CPCG01N21/63G01N21/01
Inventor 王茜蒨赵宇何力骜彭中林幼娜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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