25 January 2010 Development of FOP-HARP imaging device
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kazunori Miyakawa, Kazunori Miyakawa, Yuji Ohkawa, Yuji Ohkawa, Tomoki Matsubara, Tomoki Matsubara, Kenji Kikuchi, Kenji Kikuchi, Siro Suzuki, Siro Suzuki, Kenkichi Tanioka, Kenkichi Tanioka, Misao Kubota, Misao Kubota, Norifumi Egami, Norifumi Egami, Takuji Atsumi, Takuji Atsumi, Shonosuke Matsushita, Shonosuke Matsushita, Taisuke Konishi, Taisuke Konishi, Yuzuru Sakakibara, Yuzuru Sakakibara, Kazuyuki Hyodo, Kazuyuki Hyodo, Yoshimasa Katori, Yoshimasa Katori, Yoshiaki Okamoto, Yoshiaki Okamoto, } "Development of FOP-HARP imaging device", Proc. SPIE 7536, Sensors, Cameras, and Systems for Industrial/Scientific Applications XI, 753604 (25 January 2010); doi: 10.1117/12.838424; https://doi.org/10.1117/12.838424

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