Terahertz compressive imaging system and method

Abstract

The invention discloses a terahertz compressive imaging system and method. The system comprises 1, a terahertz generation and detection unit which comprises a laser source, a terahertz emitter and a terahertz detector, 2, a terahertz wave coding measurement unit which comprises a light splitter lens, a semiconductor mask plate and a digital projection device, wherein the digital projection device produces encoded pattern light beams, the light beams act on the semiconductor mask plate to cause semiconductor carrier distribution and the semiconductor mask plate allows the specific terahertz wave to go through the mask plate and keeps congruity of the specific terahertz wave and the light beam pattern so that terahertz wave spatial modulation is realized and a semiconductor mask plate coding function is realized, and 3, a terahertz reconstruction imaging unit which is used for recovering the original image through a reconstruction algorithm so that terahertz imaging is realized. Through combination of digital light processing projection and semiconductor photo-induced carrier characteristics, terahertz wave light-controlled modulation is realized. The system has the advantages of complete digitization, fast rate, high programmable capability, low cost and integration easiness.

Description

technical field [0001] The present invention relates to the technical field of terahertz imaging, in particular to a terahertz compression imaging system and method. Background technique [0002] Terahertz waves refer to coherent electromagnetic radiation with frequencies in the 0.1THz--10THz far-infrared band. Due to its special position in the transition from electronics to photonics in the electromagnetic spectrum, it has unique properties such as perspective, safety, and spectral resolution, so it has very important academic value and application prospects. With the development of terahertz science and technology, terahertz spectroscopy and imaging have shown great application potential in many fields such as biology, medical disease diagnosis, material science, military and basic chemical research, and have quickly become a frontier research of concern. direction. Among them, Terahertz time domain spectroscopy (THz-TDS) technology is one of the most widely studied ter...

AI Technical Summary

Problems solved by technology

The imaging time of the point-by-point scanning system is generally too long to meet the real-time requirements; area array imaging technologies such as focal plane detection array imaging, CCD imaging based on electro-optical sampling methods, etc. have shortcomings such as complex systems and expensive equipment.

Moreover, existing imaging techniques have the disadvantage of low sampling efficiency

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