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Proceedings Paper

Ultrahigh-sensitivity HDTV new super-HARP camera
Author(s): Kazunori Miyakawa; Yuji Ohkawa; Tomoki Matsubara; Tamotsu Takahata; Shiro Suzuki; Misao Kubota; Norifumi Egami; Kenkichi Tanioka; Kouichi Ogusu; Akira Kobayashi; Tadaaki Hirai; Toshiaki Kawai; Masanori Hombo; Tetsuo Yoshida
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Paper Abstract

We developed an ultrahigh-sensitivity camera tube with a 15-μm-thick high-gain avalanche rushing amorphous photoconductor (HARP) film and applied it to an HDTV camera. The camera, called the "New Super-HARP", can achieve about 30 times the sensitivity (62.5 lux, F10) of conventional HDTV CCD cameras. Furthermore, for slow-moving subjects, the camera can dramatically increase the sensitivity in the intermittent read-out mode (for an accumulation time of 4 seconds, about 240 times the sensitivity of a New Super-HARP camera under normal operations). The very-low-dark-current feature of the HARP film results in excellent video images without any fixed pattern noise. We investigated the relationship between the operating temperature of the film and the occurrence of highlight defects in 15-μm-thick HARP films when shooting fixed, strong spot-lights directly. We found that defects could be suppressed by shifting the operating temperature to 35°C from the conventional 25°C. Furthermore, we optimized the concentration of arsenic (As) doped in the film to improve the heat resistance so that the film could be used at temperatures as high as 35°C. Ultrahigh-sensitivity imaging technology using HARP has been attracting considerable interest from many fields outside of broadcasting, such as medicine, biology, and digital film production.

Paper Details

Date Published: 7 March 2005
PDF: 9 pages
Proc. SPIE 5677, Sensors and Camera Systems for Scientific and Industrial Applications VI, (7 March 2005); doi: 10.1117/12.585434
Show Author Affiliations
Kazunori Miyakawa, NHK Science and Technical Research Labs. (Japan)
Yuji Ohkawa, NHK Science and Technical Research Labs. (Japan)
Tomoki Matsubara, NHK Science and Technical Research Labs. (Japan)
Tamotsu Takahata, NHK Science and Technical Research Labs. (Japan)
Shiro Suzuki, NHK Science and Technical Research Labs. (Japan)
Misao Kubota, NHK Science and Technical Research Labs. (Japan)
Norifumi Egami, NHK Science and Technical Research Labs. (Japan)
Kenkichi Tanioka, NHK Science and Technical Research Labs. (Japan)
Kouichi Ogusu, Hamamatsu Photonics K.K. (Japan)
Akira Kobayashi, Hamamatsu Photonics K.K. (Japan)
Tadaaki Hirai, Hamamatsu Photonics K.K. (Japan)
Toshiaki Kawai, Hamamatsu Photonics K.K. (Japan)
Masanori Hombo, Hitachi Kokusai Electric Inc. (Japan)
Tetsuo Yoshida, Hitachi Kokusai Electric Inc. (Japan)


Published in SPIE Proceedings Vol. 5677:
Sensors and Camera Systems for Scientific and Industrial Applications VI
Morley M. Blouke, Editor(s)

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