Suspicious object detection method

Abstract

The invention discloses a suspicious object detection method. The suspicious object detection method comprises the steps of: detecting a target area of an object to be detected within a predeterminedtime by utilizing multiple detection units; on the basis of measurement values of the various detection units and a conversion rule, obtaining a conversion value; and, comparing the conversion value with a first threshold value and a second threshold value, so that whether a suspicious object exists in the target area or not can be judged.

Description

technical field [0001] The invention relates to the field of object detection, in particular to a suspicious object detection method. Background technique [0002] With the development of the country, in recent years, China has carried out more and more international activities and held many important exhibitions such as the World Expo and the Expo. In exhibitions where crowds gather, people need to go through security checks before entering the venue, mainly for the detection of flammable and explosive items. [0003] Neutrons are highly penetrating and can be used to detect explosives concealed in schoolbags, suitcases and other outer packaging. Neutrons interact with material elements to emit characteristic gamma rays, which are the fingerprint rays of the elements. By detecting the fingerprint rays, it can be judged whether the substance exists in schoolbags, suitcases and other outer packaging. The main component of flammable and explosive items is nitrogen. By detect...

AI Technical Summary

Problems solved by technology

[0004] Since nitrogen also exists in some non-flammable and explosive items, such as leather, wool fabrics, etc., the existing devices that use neutrons to react with nitrogen to detect the fingerprint rays of nitrogen will fail due to the detection of non-flammable and explosive materials. The nitrogen element in the explosive material will form a false alarm signal, the reliability of the device is low, and the fingerprint rays of the detected nitrogen element are not necessarily flammable and explosive items

[0005] In addition, the existing technology usually detects the entire object to be tested, so the required detection area is relatively large. Using this method, the distribution range of neutrons used for detection is relatively large, and the neutron flux Relatively small, the detection effect is not ideal and the detection efficiency is low

At the same time, due to the large detection range, it is easy to detect non-explosive substances containing nitrogen such as leather and wool fabrics, thereby introducing large interference and forming false alarm signals

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