18 November 2009 CW THz standoff imaging
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Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 75120L (2009) https://doi.org/10.1117/12.838033
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China
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.
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Chao Deng, Chao Deng, Yalin Zhang, Yalin Zhang, Junkai Mu, Junkai Mu, Yuejin Zhao, Yuejin Zhao, Cunlin Zhang, Cunlin Zhang, "CW THz standoff imaging", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120L (18 November 2009); doi: 10.1117/12.838033; https://doi.org/10.1117/12.838033
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