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Your search keyword '"Tatsuo SUGIE"' showing total 4 results
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4 results on '"Tatsuo SUGIE"'

1. Bidirectional reflectance distribution function of recrystallized tungsten mono-block exposed to cyclic heat loading

Author

Hiroki Natsume, Kunpei Nojiri, Shin Kajita, Makoto Fukuda, Tomohiko Ushiki, Hirohiko Tanaka, Tatsuo Sugie, Sin-iti Kitazawa, Takanori Kikuchi, Tomohiro Yokozuka, Noriyasu Ohno, Koichiro Ezato, and Takaki Hatae

Subjects
BRDF, Goniophotometer, Reflection modeling, Tungsten monoblock, Spectroscopic diagnostics, Recrystallization, Nuclear engineering. Atomic power, TK9001-9401
Abstract

The bidirectional reflectance distribution function (BRDF) of recrystallized tungsten mono-blocks exposed to cyclic heat loading for ITER divertor outer vertical target was measured using a goniophotometer at a wavelength of 473 nm. Laser microscope observations revealed that the surface roughness of the mono-block increased by an order of magnitude after cyclic heat loads of approximately 20 MWm−2. Furthermore, the overall values of BRDF decreased with an increase in cyclic heat loading. A comparison between the modeled and measured BRDFs showed that an additional Lambertian component is necessary to a specular function (microfacet model or Gaussian function) to fit the measured BRDFs when the surface of the mono-blocks becomes rough.

Published
2022
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2. Dual two-color method: A new concept of ultra-wide temperature range thermography (200-3600 °C) for ITER divertor infrared thermography

Author

Tomohiko Ushiki, Ryota Imazawa, Hidetoshi Murakami, Kosuke Shimizu, Tatsuo Sugie, and Takaki Hatae

Subjects
Instrumentation
Abstract

A new temperature measurement method—the dual two-color method—was developed to accurately measure the temperature over an ultra-wide temperature range (200–3600 °C) for ITER divertor infrared thermography. This novel method introduces a third wavelength filter to the conventional two-color method by replacing the shorter single wavelength bandpass filter with a customized dual-bandpass filter having two transmission bands, without having to add a third infrared camera. The dominant wavelength band of the total radiance through the dual-band filter changes automatically as the temperature increases and, consequently, either the shorter or longer wavelength band of the dual-bandpass filter is used to establish the two-color combination at both low and high temperatures. The dual two-color method increased the acceptable measurement error of the two-color radiance ratio for the temperature measurement requirement of the ITER divertor infrared thermography to 9.45% from that of 4.3% when using the conventional two-color method.

Published
2022

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