Method and system for scanning terahertz waves

Abstract

The invention relates to a method and a system for scanning terahertz waves. The system comprises a reflection device, a No.1 refraction device, a No.2 refraction device, a transmission device and a detection device, wherein the reflecting surface, the refracting surfaces or the transmitting surface of the devices are perpendicular to a common plane; the reflection device oscillates around an oscillating axle which is perpendicular to the common plane in the reflecting surface and reflects the terahertz waves onto the refracting surface of the No.1 refraction device; the No.1 refraction device and the No.2 refraction device rotate at angular velocities of the same size and opposite directions from the same initial position by taking a coincident center line of the two refraction devices as a rotation axis, wherein wedge angles theta 1 and theta 2, refractive indexes n1 and n2, and light path lengths L1 and L2 of the terahertz waves from an object point to the refracting surfaces of the No.1 refraction device and the No.2 refraction device meet the following relations that: L1*tan(arcsin(n1sin theta1)-theta1)=L2*tan(n2sin(arcsin(arcsin(n1sintheta1)-theta1) / n2+theta2))-theta2), the No.1 refraction device and the No.2 refraction device refract the terahertz waves onto the transmitting surface of the transmission device; and the transmission device converges the terahertz waves onto the detection device positioned at an image point. By the technical scheme, targets to be detected can be quickly scanned.

Description

technical field [0001] The present invention relates to the application field of terahertz waves, in particular to a terahertz wave scanning method and system. Background technique [0002] Terahertz wave, also known as T-ray, is a special electromagnetic wave with a frequency range of 0.1-10THz and a wavelength of 30-3000 microns. The frequency of terahertz waves is very high, so it has high spatial resolution and can be used to image the target to be detected. Moreover, the photon energy of the terahertz wave is very small, only one millionth of the X-ray photon energy, so the radiation damage of the terahertz wave to the living body is very small, which is a significant advantage of using the terahertz wave for imaging. [0003] The existing scanning technology using terahertz waves is to use a terahertz wave detection device to detect the terahertz waves radiated by the object points on the target to be detected, or to detect the terahertz waves reflected by the object ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that in the existing scanning technology using terahertz waves, it is necessary to use the motor to drive the terahertz wave detection device to move row by row or column by row to realize the scanning of all object points on the target to be detected, and the moving speed of the motor is relatively low. Slow, so it takes a long time to complete the scan

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