An all-electronic terahertz tomography device and its control method

Abstract

The invention discloses an all-electronic terahertz tomography device and a control method thereof. The device comprises: a dual-channel microwave signal source for generating one channel of radio frequency microwave signal and one channel of local oscillator microwave signal; a multi-channel spread spectrum module , used to expand 1 channel of RF microwave signal and 1 channel of local oscillator microwave signal into N channels of RF microwave signal and N channel of local oscillator microwave signal, and generate 1 channel of reference intermediate frequency signal; multi-transmission and multi-reception terahertz ring array is used for Frequency multiplication and amplification of N channels of RF microwave signals and N channels of local oscillator microwave signals are performed to generate N channels of terahertz transmission signals and N channels of terahertz local oscillator signals, and N channels of terahertz local oscillator signals are combined with N channels of tested samples The scattered signals are mixed to obtain N test intermediate frequency signals; the multi-channel synchronous acquisition unit is used to collect N test intermediate frequency signals and one reference intermediate frequency signal; the main control computer collects and processes the scattering data of the tested sample, and compares the The algorithm realizes high-resolution imaging of the tested sample.

Description

technical field [0001] The present disclosure relates to the technical field of terahertz imaging, in particular to an all-electronic terahertz tomography device and a control method thereof. Background technique [0002] Terahertz waves are located between microwaves and infrared rays, and have physical properties such as no ionizing radiation, high resolution, harmlessness to the human body, and strong penetrability. Terahertz imaging can obtain images of the spatial density distribution of substances, so terahertz imaging is especially suitable for applications such as internal structure measurement and defect imaging of materials that are invisible to visible light and have insufficient X-ray contrast. Compared with ultrasonic waves, terahertz waves have small attenuation, deep penetration, and short wavelength in the tested sample, and can obtain high-resolution imaging effects, which can visually display internal defects; compared with X-rays, it will not be destroyed ...

AI Technical Summary

Problems solved by technology

[0003] For terahertz imaging, the inventor found in the research and development process that the current common method is to install the terahertz transceiver module or the sample under test on a mechanical motion device for scanning. This method is simple in structure, but the test efficiency is low. In addition, because only Using the reflection or transmission information of the measured sample, theoretically only half the theoretical resolution of the wavelength can be obtained

Images