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Proceedings Paper

CW THz standoff imaging
Author(s): Chao Deng; Yalin Zhang; Junkai Mu; Yuejin Zhao; Cunlin Zhang
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Paper Abstract

We present a continuous-wave (CW) terahertz (THz) standoff scanning imaging system at 0.2 THz. This system works at reflection geometry and the imaging distance is 30 m. A Gunn oscillator is utilized as emitter and an unbiased Schottky diode operated at room temperature is employed as detector. A polyethylene Fresnel lens is used to collimation terahertz wave for standoff propagation. five aluminum mirrors are employed to increase distance. The sample is placed on an X-Y two-dimensional stage which is controlled by a computer. The collimated THz wave propagates in air and is focused to the sample by another polyethylene Fresnel lens. The back scatted THz wave from the sample surface is collected by the detector alone the same path. The two-dimensional image of sample is obtained by a raster scanning fashion. An aluminum plate with holes, an airplane model and a toy gun contained in a box are imaged at 30 m from the imaging unit. The results show that this standoff imaging system has a wide potential to be applied in the area of security inspection and screening.

Paper Details

Date Published: 18 November 2009
PDF: 9 pages
Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120L (18 November 2009); doi: 10.1117/12.838033
Show Author Affiliations
Chao Deng, Beijing Institute of Technology (China)
Yalin Zhang, Beijing Institute of Technology (China)
Junkai Mu, Beijing Institute of Technology (China)
Yuejin Zhao, Beijing Institute of Technology (China)
Cunlin Zhang, Capital Normal Univ. (China)

Published in SPIE Proceedings Vol. 7512:
2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security
Cunlin Zhang; Tiegen Liu, Editor(s)

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