Total reflection type Terahertz-wave scanning imaging device

Abstract

The invention discloses a total reflection type Terahertz-wave scanning imaging device. A plurality of ellipsoidal lenses are adopted to form a polyhedron focusing scanning lens, wherein the ellipsoidal lenses are symmetrically arranged relative to the central axis through a focus in an ellipsoid on which the ellipsoidal lenses are arranged. When the polyhedron focusing scanning lens rotates to scan an imaged object, each ellipsoidal lens on the ellipsoid can converge Terahertz waves received from a frame scanning plane mirror to the other focus, deflection of a converging point cannot be caused by vibration of the ellipsoidal lens, so that imaging quality is improved. When the polyhedron focusing scanning lens rotates, through matching with the frame scanning plane mirror, each ellipsoidal lens which passes by a reflective light path of the frame scanning plane mirror can carry out one row of scanning on the imaged object in a transverse range, and the polyhedron focusing scanning lens rotates for a circle to obtain N rows of pixel data. Compared with a scanning imaging device with one ellipsoidal lens, the total reflection type Terahertz-wave scanning imaging device greatly improves the speed of scanning and imaging.

Description

technical field [0001] The invention relates to a terahertz wave scanning imaging technology, in particular to a total reflection terahertz wave scanning imaging device. Background technique [0002] Terahertz waves are between infrared and millimeter waves, and have good penetrability to textiles, leather and other materials, and the resulting images have higher spatial resolution; they are several orders of magnitude lower than X-ray energy, and will not affect biological tissues. Therefore, the terahertz wave imaging device is practical and can effectively complement traditional security inspection devices. [0003] At present, detectors in the terahertz band are expensive, and focal plane imaging cannot be used in terahertz imaging, and scanning imaging is mostly used. In the non-contact, large field of view, fast, and high-resolution human body terahertz scanning imaging that meets the needs of public places such as airports and stations, terahertz beam scanning imagin...

AI Technical Summary

Problems solved by technology

In total reflection scanning imaging, the system that uses the two-dimensional movement of the reflective surface to realize the scanning imaging of the imaged object will prolong the imaging time and reduce the imaging quality; the method of using a single scanning mirror to realize the scanning imaging of the measured object will Increased imaging time and increased motion complexity of the scanning device

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