Terahertz human body safety check system and method

Abstract

The invention discloses a terahertz human body safety check system and method. The safety check system includes a terahertz human body safety check scanning mechanism, a control circuit board connected to a terahertz detector in the terahertz human body safety check scanning mechanism, an industrial control computer connected with the control circuit board, and an image display connected with the industrial control computer. A rack of the terahertz human body safety check scanning mechanism is provided with a rolling cylinder type multi-face reflecting rotary mirror and a rotation driving mechanism driving the rolling cylinder type multi-face reflecting rotary mirror to rotate and a horizontal swinging driving device driving the rolling cylinder type multi-face reflecting rotary mirror to swing horizontally. An upper concave mirror and a lower concave mirror are disposed in the tilt upward side and the front tilt downward side of the rolling cylinder type multi-face reflecting rotary mirror and both of the upper concave mirror and the lower concave mirror face towards the rolling cylinder type multi-face reflecting rotary mirror. The terahertz human body safety check system and method have advantages of high scanning speed, low vibration and noise, simple mechanical structure, low manufacture cost and the like.

Description

technical field [0001] The invention belongs to the technical field of terahertz applications, and in particular relates to a terahertz human body security inspection system and method. Background technique [0002] Terahertz is an electromagnetic wave with a frequency of 0.1THz-10THz. The wave band is between infrared and millimeter waves, and it occupies an important position in the electromagnetic spectrum. From the perspective of physics, terahertz waves are in the transition zone from electronics to photonics; from the perspective of frequency domain, the frequencies of terahertz waves cover the characteristic frequencies of plasma waves in semiconductors, the rotation and vibration frequencies of organic and biological macromolecules, About 50% of the cosmic photon frequency and other important frequency ranges; from the perspective of application, terahertz waves have the characteristics of wide frequency band, low energy, strong coherence, and high measurement signal...

AI Technical Summary

Problems solved by technology

Since the number of all parts and optical devices is doubled, including motors, screw rods, and drivers are also independent upper and lower sets, so the mechanical structure is complicated and the cost is high

In addition, the pendulum mirror adopts a reciprocating swing form, which is characterized by the process of accelerating and decelerating to zero, and then moving in the opposite direction. The motion acceleration is large. If the mechanism cannot be made light enough, the inertia and vibration will be large, and the speed cannot be increased. , once the scanning speed of the swing mirror is increased, the noise of the screw will increase significantly, and even the motor overload alarm will appear.

[0010] Moreover, the imaging method of the existing terahertz human body security detector is to directly stack pixels by scanning line by line, so there are problems of large image deformation, blurred imaging, and low resolution.

[0011] In addition, the output voltage of the current terahertz detector will drift after working continuously for a period of time, which requires pausing the human body scan and ensuring that there is no detection object in the scanning area, switch to the calibration mode, and click the calibration soft button to perform manual calibration , can continue to work after calibration

The calibration interval of this calibration method is too long to solve the problem of detector drift during a scan

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