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Proceedings Paper

Spatial resolution improvement of the scanning detector
Author(s): Yasuto Katoh; Yoshihiro Ito; Nobuhisa Tomonura; Satoshi Tomioka; Takeaki Enoto
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Paper Abstract

In the scanning detector we propose the new system for improving spatial resolution by making sensitivity distribution of a detecting element vary. This can be simply done by only adding the filter with sensitivity distribution in front of a detecting element without requiring the higher density of equipment. In our laboratory, the plasma electron density distribution measurement by the holographic interferometry in far-infrared region has been proceeded. As one of the infrared detection material, we chose HgCdTe, and it was used as a scanning detecting element. As a verification of this system, we added the infrared filter in the front of HgCdTe, and measured the spatial resolution using a knife edge. For the method for calculating Modulation Transfer Function (MTF) from Edge Response Function (ERF), we also propose the new technique that we name the virtual test chart method. In this technique, we simulate the response corresponded to periodic bar patterns from ERF, and calculate the contrast ratio from this response. From the result of measurement that added the infrared ray filter, the validity of this system was shown. By the simulation and the experiment, the optimum sensitivity distribution was obtained in this system.

Paper Details

Date Published: 17 April 2001
PDF: 8 pages
Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); doi: 10.1117/12.424279
Show Author Affiliations
Yasuto Katoh, Hokkaido Univ. (Japan)
Yoshihiro Ito, Hokkaido Univ. (Japan)
Nobuhisa Tomonura, Hokkaido Univ. (Japan)
Satoshi Tomioka, Hokkaido Univ. (Japan)
Takeaki Enoto, Hokkaido Univ. (Japan)

Published in SPIE Proceedings Vol. 4183:
24th International Congress on High-Speed Photography and Photonics
Kazuyoshi Takayama; Tsutomo Saito; Harald Kleine; Eugene V. Timofeev, Editor(s)

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