Affiliations: Power and Industrial Systems R&D Center, Industrial
and Power Systems & Services Company, Toshiba Corporation, 8
Shinsugita-cho, Isogo-ku, Yokohama 235-8523, Japan. E-mail:
chikara.konagai@toshiba.co.jp, koichi.nittoh@toshiba.co.jp | Power and Industrial Systems R&D Center, Industrial
and Power Systems & Services Company, Toshiba Corporation, 4-1
Ukishima-cho, Kawasaki-ku, Kawasaki 210-0662 Japan | Isogo Nuclear Engineering Center, Industrial and Power
Systems & Services Company, Toshiba Corporation, 8 Shinsugita-cho,
Isogo-ku, Yokohama 235-8523, Japan | Joint Research Center For Supercritical Fluids, Japan
Chemical Innovation Institute, 4-2-1 Nigatake, Miyagino-ku, Sendai 983-8551,
Japan
Abstract: A real-time X-ray visualization system for low X-ray absorption
materials has been developed. The system is mainly composed of a multi-color
scintillator based image intensifier and a real-time image-processing unit. The
color image intensifier has such advantages as the high sensitivity, the wide
dynamic range and the long lifetime over the conventional one. The dynamic
imaging of low X-ray absorption materials was realized by the video-rate image
subtraction function of the image processor. The system has been successfully
applied for an observation of a carbon-particle oxidation process in
supercritical water. The low X-ray absorption difference between carbon and
supercritical water, surrounded by high X-ray absorption metal wall, is one of
the most difficult objects to get good image. In our system, the
carbon-particle image was taken at a 30 frame/sec video-rate by continuously
subtracting the background image until at the instance of the carbon-particle
disappearance by oxidation.
Keywords: X-ray imaging, Color image intensifier, Real-time image processing, Supercritical water, Oxidation process
