Tomography imaging system and method based on terahertz quantum device

Abstract

The invention relates to a tomography imaging system and method based on a terahertz quantum device. The system comprises a terahertz source part, a transmission convergence light path system, a rotary parallel scanning table and a terahertz signal detection part, wherein the terahertz source part comprises a terahertz quantum cascade laser, a drive power supply and a chopping fan; the transmission convergence light path system comprises a first off-axis parabolic mirror group and a second off-axis parabolic mirror group; and the terahertz signal detection part comprises a terahertz quantum well detector, a signal processing module and a phase-locked amplifier. The method comprises the following steps: the continuous terahertz waves emitted by the terahertz quantum cascade laser are modulated by the chopping fan and converged on a sample by one off-axis parabolic mirror group; the terahertz waves penetrate through the sample and are converged to the terahertz quantum well detector through the other parabolic mirror group to generate a response light current; the light current signal is converted into a voltage signal; the voltage signal is amplified by a low-noise amplifier; and the data is read by the phase-locked amplifier. According to the invention, the tomographic image information of the sample can be effectively obtained.

Description

technical field [0001] The invention relates to the technical field of terahertz applications, in particular to a tomography imaging system and method based on terahertz quantum devices. Background technique [0002] At present, tomography technology mainly uses high-energy and strong penetrating rays such as X-rays. Although the technology is mature, due to the high energy of the rays, it will cause great damage to the human body and the environment, and its use has relatively large side effects and dangers. Terahertz The frequency of X-rays ("THz waves" for short) is much lower than that of X-rays, and the energy is not enough to ionize biomolecules, so it has a good application prospect in the field of medical applications. At the same time, THz waves can also penetrate high-strength polyethylene / polypropylene and other non- polar material. Based on the above characteristics, the tomographic scanning technology of THz waves can be widely used in the fields of medicine an...

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Problems solved by technology

[0002] At present, tomography technology mainly uses high-energy and strong penetrating rays such as X-rays. Although the technology is mature, due to the high energy of the rays, it will cause great damage to the human body and the environment, and its use has relatively large side effects and dangers. Terahertz The frequency of X-rays ("THz waves" for short) is much lower than that of X-rays, and the energy is not enough to ionize biomolecules, so it has a good application prospect in the field of medical applications. At the same time, THz waves can also penetrate high-strength polyethylene / polypropylene and other non- polar material

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