16 February 2009 2.52-THz scanning reflection imaging and image preprocessing
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Terahertz radiation has high penetration capability and will not cause harmful ionization to human beings; therefore THz reflection imaging has wide application prospect in security inspection and counter-terrorism. However the reflection signal in THz active imaging is weak and the sensitivity of existing detectors in this wave band is low. In this paper the 2.52-THz laser reflection imaging system based on scanning imaging is constructed. The FIR laser of SIFIR-50FPL made by Coherent Inc in America is chosen as the THz radiation source and its power is about 30mW. The detector of P4-42 made by the Molectron Corporation is adopted, which works at the room temperature with the spectral range from 1nm to over 1mm. The imaging experiments on knives and some other objects are made utilizing this system. The images of concealed objects are obtained and the images are clearer after image preprocessing. The experimental results show that this imaging system has wide application potential in security inspection.
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Qi Li, Qi Li, Rui Yao, Rui Yao, Qiquo Yin, Qiquo Yin, Jixin Shan, Jixin Shan, Qi Wang, Qi Wang, "2.52-THz scanning reflection imaging and image preprocessing", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 72770J (16 February 2009); doi: 10.1117/12.821161; https://doi.org/10.1117/12.821161

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