期刊
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
卷 1, 期 1, 页码 183-200出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2011.2159559
关键词
Demodulating detector array; electrooptic terahertz detection; femtosecond systems; optical parametric oscillator; photonic detectors; photonic-mixer device; photonic systems; submillimeter-wave imaging; submillimeter-wave technology; synthetic-aperture imaging; synthetic-aperture radar; terahertz imaging
资金
- Federal Ministry of Education and Research Germany (BMBF) through Project LYNKEUS
- Federal Ministry of Education and Research Germany (BMBF) through Project TERACAM
- Federal Ministry of Education and Research Germany (BMBF) through Project TEKZAS
- Federal Ministry of Education and Research Germany (BMBF) through Project LiveDetect3D
- German Research Foundation (DFG) through PAK-73 Dynamisches 3-D Sehen mit PMD
- European Space Agency ESA/ESTEC [21155/07/NL/ST]
- WI Bank Hessen
- Oerlikon AG
This paper presents a survey of the status of five active THz imaging modalities which we have developed and investigated during the last few years with the goal to explore their potential for real-time imaging. We start out by introducing a novel waveguide-based all-electronic imaging system which operates at 812 GHz. Its salient feature is a 32-pixel linear detector array heterodyne-operated at the eighth subharmonic. This array in combination with a telescope optics for object distances of 2-6 m reaches a data acquisition speed suited for real-time imaging. The second system described then is again an all-electronic scanner (now for around 300 GHz), designed for object distances of 8 m, which combines mechanical scanning in vertical direction, synthetic-aperture image generation in horizontal direction, and frequency-modulated continuous-wave sweeping for the depth information. The third and fourth systems follow an optoelectronic approach by relying on several-to multi-pixel parallel electrooptic detection. One imager is based on a pulsed THz-OPO and homodyne detection with a CCD camera, the other on either continuous-wave electronic or femtosecond optoelectronic THz sources and a photonic-mixing device (PMD) camera. The article concludes with a description of the state of the art of imaging with focal-plane arrays based on CMOS field-effect transistors.
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