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27 April 2010 Indirect holographic imaging: evaluation of image quality at 310 GHz
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We present an active THz-imaging technique, which utilizes holographic process in image retrieval. In this technique, information of the target is stored in an interference pattern. The pattern is formed with a reference field and a field reflected from the target. This technique, called indirect holographic imaging, involves only amplitude detection. The image of the target is formed computationally from the complex field given by the holographic process. An experimental imaging system operated at 310 GHz is described. Millimeter-wave images of different targets are presented. The imager performance is described with image signal-to-noise ratio and noise equivalent reflectivity difference, as well as with the cross-range resolution. The indirect holographic imaging method is assessed with variable system signal-to-noise ratios. A knife-edge method is utilized to approximate the point spread function of the imaging system. Cross-range resolution of 0.18° and noise equivalent reflectivity level of 0.002 is achieved with an experimental imager at 310 GHz with 40-cm aperture.
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A. Tamminen, J. Ala-Laurinaho, and A. V. Räisänen "Indirect holographic imaging: evaluation of image quality at 310 GHz", Proc. SPIE 7670, Passive Millimeter-Wave Imaging Technology XIII, 76700A (27 April 2010);

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