16 February 2009 1.63-THz transmission imaging experiment by use of a pyroelectric camera array
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With the deepening of research on the terahertz imaging, real-time imaging is becoming more and more important. Right after Massachusetts Institute of Technology demonstrated 2.52-THz CW imaging by use of a 160×120 element microbolometer camera with spectral coverage from 7.5-14 μm, the single frequency CW THz imaging using the focal-plane array has become a new research direction. In this paper, 124×124 array transmission imaging is demonstrated. The 1.63-THz CW CO2-pumped laser with the output power of 45mW is used as the illumination source, and a pyroelectric camera is adopted as the array detector with spectral response range of 1.06μm - >1mm. In the imaging experiments, RMB watermark, gasket and key are chosen as objects and several pieces of paper are placed before the objects to test the transmission imaging effect. The experimental results show that utilizing the experimental devices designed in this paper the 1.63-THz images generated are basically clear and objects' contours are clear. The images of gasket and key can be generated penetrating at most 4 pieces of B5 paper in the transmission distance of 0.5m when the power is 45mW and the focal length of polyethylene lens is 120mm.
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Rui Yao, Rui Yao, Qi Li, Qi Li, Qi Wang, Qi Wang, } "1.63-THz transmission imaging experiment by use of a pyroelectric camera array", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 72770D (16 February 2009); doi: 10.1117/12.820868; https://doi.org/10.1117/12.820868

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