Terahertz rapid two-dimensional scanning system and method

Abstract

The invention discloses a terahertz rapid two-dimensional scanning system and method. The scanning system is composed of a transmitting antenna, a receiving antenna, a planar reflection mirror, a first scanning motor, and a second scanning motor. The receiving direction of the receiving antenna is parallel to the transmitting direction of the transmitting antenna. A transmitting antenna wave beam of the transmitting antenna is reflected to a scanning area by the planar reflection mirror and a receiving antenna wave beam formed at the scanning area is reflected to the receiving antenna by the planar reflection mirror, so that the transmitting antenna wave beam and the receiving antenna wave beam moves synchronously. A rotating shaft of the first scanning motor is connected to the planar reflection mirror, so that the planar reflection mirror rotates around a horizontal plane. A rotating shaft of the second scanning motor is perpendicular to the horizontal plane to control the first scanning motor and the planar reflection mirror to rotate around a plumb line. The scanning angle is large and the imaging speed is fast.

Description

technical field [0001] The invention relates to terahertz wave radar imaging technology, in particular to a terahertz fast two-dimensional scanning system and method. Background technique [0002] Terahertz (THz) refers to electromagnetic waves with a frequency between 0.1 THz and 10 THz (wavelength between 3 mm and 30 μm). The bandwidth of the THz band is much higher than that of the microwave band, the wavelength is shorter, and it has a larger signal bandwidth, which can better overcome the shortcomings of low imaging resolution in the microwave band. Poor penetration and other deficiencies. [0003] At present, most terahertz wave imaging systems are transmission imaging, and there are few systems with scanning imaging functions. Systems with added scanning functions are only suitable for short-distance and constant distance applications with small scanning angles, such as security inspections, sample analysis, etc. In the field of application, there are few active ter...

AI Technical Summary

Problems solved by technology

The electronic scanning system realizes scanning by electronically controlling the antenna beam. The frequency scanning antenna does not require mechanical movement for electronic scanning, so the scanning speed is relatively fast and the accuracy is relatively high. However, there are many reasons that restrict the development of terahertz electronic scanning imaging, such as The design of the antenna is difficult, the structure is complex, the radiation efficiency is low, and the loss is large. At present, there are no relevant reports on the successful engineering of electronically controlled antennas at home and abroad.

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