Security inspection method based on terahertz waves

Abstract

The invention discloses a security inspection method based on terahertz waves. The method comprises the following steps: a detection device transmits a terahertz wave beam to a human body to be inspected; the detection device receives the terahertz reflected wave of the human body to be inspected; the distance between the current reflection point of the human body to be inspected and the detectiondevice is calculated by using the terahertz reflected wave; the detection device is moved to different positions and the above steps are repeated so as to continuously measure the distance value between different reflection points of the human body to be detected and the detection device; the variation difference of a currently measured distance value relative to the distance value of an adjacentreflection point is judged in real time; if the variation difference exceeds a threshold value, it is judged that there is an abrupt change, namely, the abnormity, at the position. The invention alsodiscloses a security inspection device based on terahertz waves. The invention reduces the complexity of security inspection algorithms and security inspection devices, reduces the application cost,and simultaneously improves the scanning efficiency and the scanning speed.

Description

technical field [0001] The invention relates to the field of security inspection, in particular to a method and device for security inspection based on terahertz waves. Background technique [0002] At present, the human body security inspection in public places mainly relies on metal security gates combined with hand-held metal security detectors to complete, which is time-consuming and labor-intensive. However, the traditional X-ray security detector cannot be used as a human body security detector because of its strong radiation and ionization damage to the human body. Compared with X-rays, terahertz electromagnetic waves have lower photon energy and will not produce ionizing radiation to biological tissues, and terahertz waves can easily penetrate clothing, which has a great advantage in security inspection of the human body. At present, the application of terahertz in domestic and foreign security checks mainly uses imaging to scan the human body, which is expensive an...

AI Technical Summary

Problems solved by technology

At present, terahertz applications at home and abroad mainly use imaging methods for human body scanning, which is expensive and takes a long time, which is not conducive to large-scale application

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