Detail Imaging Through Scattering Media With Lens And A Spatial Filter: System Resolution And Signal To Noise Ratio   Oleh:  Juliastuti Mustafa, E. ; Handojo, Andrianto Jenis: Article from Article Dalam koleksi: Final Program and Book of Abstracts: The 4th Asian Control Conference, September 25-27, 2002 (Sep. 2002), page 791-796. Topik: Noise Ratio; Scattering Media; Lens Fulltext: AC021586.PDF (354.0KB) Isi artikel The imaging through a scattering medium using a positive lens and a small circular spatial filter is described in this paper. A semi transparent object is illuminated with parallel rays. If a scattering medium exists between the object and the imaging lens, almost all rays will be scattered. However, a few unscattered rays are still parallel and focused at the lens focal point. If a small circular hole is placed as a spatial filter at the focal point, it passes those parallel rays carrying the object information which will form an image despite of the existence of the scattering media. On the other hand, the hole limits the resolution of the imaging setup and determined also the amount of noise in the image induced by the scattered rays In the absence of the scattering media, the setup resolution simply increases with a wider filter diameter. It is derived in this paper that in the presence of the scattering medium, a wider filter diameter reduces the resolution while if the scattering medium moves, the tendency of the resolution approaches that in the absence of the medium. The experimental results for signal to noise ratio confirmed the theoretical equation derived in this paper, i.e. the signal to noise ratio decreases with a larger filter diameter. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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