Rapid terahertz continuous wave scanning imaging system and method

Abstract

The invention discloses a rapid terahertz continuous wave scanning imaging system and method and aims at providing a rapid terahertz continuous wave scanning imaging scheme. With the adoption of the scheme, the scanning imaging speed is increased, the resolution ratio is improved, and the system can stably operate at room temperature for a long time. Therefore, with the adoption of the technical scheme, according to the rapid terahertz continuous wave scanning imaging system and method, the terahertz radiation is subjected to beam splitting, and the signal to noise ratio of an imaging result is increased by introducing reference light; signal light is focused to vertically radiate to a sample, the sample is fixed on a two-dimensional translation stage, the scanning imaging is realized by changing the sample position, the two-dimensional translation stage is stable in moving speed without pause, the intensity values of the signal light and pump light are detected by using detectors of the same model, data of two terahertz detectors at corresponding positions are recorded according to the position of the translation stage, and the terahertz transmission scanning imaging result of the sample is obtained by comparison. The system and the method are mainly applied to the terahertz continuous wave scanning imaging.

Description

technical field [0001] The present invention relates to a fast terahertz continuous wave scanning imaging system and method, belonging to the technical field of terahertz imaging. Specifically, it relates to a fast terahertz continuous wave scanning imaging system and method. technical background [0002] Terahertz continuous wave scanning imaging technology is one of the main methods of terahertz imaging technology. At present, terahertz imaging technology is mainly divided into pulse wave imaging and continuous wave imaging. The former requires a femtosecond laser as a pump source, and the system cost is high, the volume is large, and the scanning speed is slow. The continuous wave imaging system can choose an area array camera as a terahertz wave detector, which has a fast imaging speed, but the imaging quality is limited by the camera array, and the imaging quality is poor. In the reported terahertz continuous wave scanning imaging technology, Gunn oscillator is mostly...

AI Technical Summary

Problems solved by technology

At present, terahertz imaging technology is mainly divided into pulse wave imaging and continuous wave imaging. The former requires a femtosecond laser as a pump source, and the system cost is high, the volume is large, and the scanning speed is slow.

The continuous wave imaging system can choose an area array camera as the terahertz wave detector, the imaging speed is fast, but the imaging quality is limited by the camera array, and the imaging quality is poor

In the reported terahertz continuous wave scanning imaging technology, Gunn oscillator is mostly used as the light source of the imaging system, its output wavelength is longer, and the imaging quality is poor; in some reports, carbon dioxide gas laser is used as the pump source to generate terahertz radiation Carried out scanning imaging studies with improved resolution and reported imaging resolutions above 0.2mm

The scanning method used in the reported terahertz continuous wave scanning imaging technology is that the platform moves a scanning step, and a data acquisition is performed. There is a scanning interval, generally about 0.5 seconds, and the variable speed movement and pause of the translation platform cause long scanning time. , the imaging speed is slow, and the time required for imaging is between tens of minutes to several hours

The lack of imaging resolution and scanning speed of existing imaging systems and methods restricts their practical application in the field of scientific research and biomedical detection

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