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Proceedings Paper

Development of FOP-HARP imaging device
Author(s): Kazunori Miyakawa; Yuji Ohkawa; Tomoki Matsubara; Kenji Kikuchi; Siro Suzuki; Kenkichi Tanioka; Misao Kubota; Norifumi Egami; Takuji Atsumi; Shonosuke Matsushita; Taisuke Konishi; Yuzuru Sakakibara; Kazuyuki Hyodo; Yoshimasa Katori; Yoshiaki Okamoto
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Paper Abstract

The high-gain avalanche rushing amorphous photoconductor (HARP) camera tube achieves ultrahigh-sensitivity by using the avalanche multiplication. The applications of this tube extend beyond broadcasting into other fields. It is attracting a great deal of attention especially for radiation diagnosis, such as synchrotron radiation microangiography, because it can obtain high-resolution and high-contrast images with a low dose of radiation. However, in the present system, a fluorescent screen and the photoconductive film of the HARP tube are connected optically by a lens-coupling method, and low light throughput remains a big problem. To improve the light throughput by using a fiber-coupling method, we applied a fiber-optic plate (FOP) to the substrate of a HARP tube. The FOP consists of three types of glass that have differing hardnesses and elastic coefficients that make it difficult to flatten the FOP surface enough to form the HARP film. We thus introduced a new mechanical polishing method and succeeded in realizing avalanche multiplication in the FOP-HARP tube. The results of shooting experiments by applying the FOP-HARP to the microangiography showed that a spatial resolution of over 20 line pairs/mm was obtained. Moreover, rat femoral arteries of 150-200 μm in diameter could be visualized as motion pictures with a one-fourth lower concentration of contrast material than that needed for ordinary microangiography. Another potential application of the FOP-HARP is an ultrahigh-sensitivity nearinfrared (NIR) image sensor made by fiber-coupling with an image intensifier (I.I.). The image sensor provides highquality images and should be a powerful tool for NIR imaging.

Paper Details

Date Published: 25 January 2010
PDF: 8 pages
Proc. SPIE 7536, Sensors, Cameras, and Systems for Industrial/Scientific Applications XI, 753604 (25 January 2010); doi: 10.1117/12.838424
Show Author Affiliations
Kazunori Miyakawa, NHK Engineering Services, Inc. (Japan)
Yuji Ohkawa, NHK Science & Technical Research Labs. (Japan)
Tomoki Matsubara, NHK Science & Technical Research Labs. (Japan)
Kenji Kikuchi, NHK Science & Technical Research Labs. (Japan)
Siro Suzuki, NHK Science & Technical Research Labs. (Japan)
Kenkichi Tanioka, NHK Science & Technical Research Labs. (Japan)
Misao Kubota, NHK Science & Technical Research Labs. (Japan)
Norifumi Egami, NHK Science & Technical Research Labs. (Japan)
Takuji Atsumi, Hamamatsu Photonics K.K. (Japan)
Shonosuke Matsushita, Tsukuba Univ. (Japan)
Taisuke Konishi, Tsukuba Univ. (Japan)
Yuzuru Sakakibara, Tsukuba Univ. (Japan)
Kazuyuki Hyodo, High Energy Accelerator Research Organization (Japan)
Yoshimasa Katori, Okamoto Optics Co., Ltd. (Japan)
Yoshiaki Okamoto, Okamoto Optics Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 7536:
Sensors, Cameras, and Systems for Industrial/Scientific Applications XI
Erik Bodegom; Valérie Nguyen, Editor(s)

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