Real-time terahertz imaging device and real-time terahertz imaging method

Abstract

The invention relates to a real-time terahertz imaging device and a real-time terahertz imaging method. The real-time terahertz imaging device comprises a terahertz radiating device, a chopper, an electrically-controlled and three-dimensional-displacement carrying platform, an optical path adjusting device, a focal plane detector and an acquiring and processing module, the terahertz radiating device is used for generating and emitting terahertz waves, the chopper is used for adjusting duty ratios of the terahertz waves, the electrically-controlled and three-dimensional-displacement carrying platform is used for fixing a to-be-tested sample and adjusting the position of the to-be-tested sample so as to enable the terahertz waves to transmit through the to-be-tested sample, the optical pathadjusting device is for adjusting optical paths of the terahertz waves, the focal plane detector is used for detecting compressed terahertz waves in a field of view and carrying out photoelectric conversion to output electrical signals, and the acquiring and processing module is used to processing the electrical signals output by the focal plane detector and imaging. The real-time terahertz imaging device has the advantages that terahertz focal plane array imaging and the design of arrayed conditioning circuits are adopted, the responding speed is around 5Mus, the response speed of an imagingsystem is less than 30ms, the whole imaging device can perform rapid terahertz imaging, and the frame frequency is above 26Hz; the terahertz imaging device has certain ability of remodeling an external contour of an object in three dimensions, and recognition accuracy of the object under test can be improved effectively.

Description

technical field [0001] The invention relates to the field of imaging technology, in particular to a real-time terahertz imaging device and method. Background technique [0002] Terahertz (Terahertz) waves usually refer to electromagnetic waves with a wavelength of 30μm-3mm (that is, a frequency of 0.1THz-10THz). Its frequency band is between microwave and infrared light, and it has many unique advantages, such as high transparency, low energy, selective absorption, etc. Terahertz waves have broad application prospects in the fields of safety and security, medical treatment, food safety, space communication, non-destructive testing and environmental monitoring. [0003] At present, terahertz technology has achieved rapid development, terahertz radiation source and terahertz detector technology is becoming more and more mature, and the corresponding terahertz imaging technology has also been developed rapidly. Existing terahertz transmission imaging devices are generally of ...

AI Technical Summary

Problems solved by technology

Existing terahertz transmission imaging devices are generally point-by-point scanning. The disadvantage of this device is that the imaging speed is relatively slow due to the need to scan each pixel one by one.

For example, under normal circumstances, it takes 2048 sampling points to collect a terahertz spectrum, and it takes about 200s to obtain a complete spectrum, and it takes more than 3 hours to form a simple 8×8 pixel terahertz image, so the imaging efficiency is extremely high. Low, which greatly limits its scope of application

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