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Saruta, Koichi; Shirahama, Takuma*; Yamaguchi, Toshihiko; Ueda, Masashi
E-Journal of Advanced Maintenance (Internet), 10(2), p.1 - 8, 2018/08
Saruta, Koichi; Yamaguchi, Toshihiko; Ueda, Masashi
E-Journal of Advanced Maintenance (Internet), 7(4), p.NT75_1 - NT75_8, 2016/02
Saruta, Koichi; Yamaguchi, Toshihiko; Ueda, Masashi
EUR-27790-EN, p.209 - 214, 2016/00
Saruta, Koichi; Kobayashi, Takao*
EUR-26577-EN, p.490 - 496, 2014/07
Saruta, Koichi; Tsukimori, Kazuyuki; Shimada, Yukihiro; Nishimura, Akihiko; Kobayashi, Takao*
Nihon Hozen Gakkai Dai-6-Kai Gakujutsu Koenkai Yoshishu, p.219 - 222, 2009/08
A thermal-resistant fiber Bragg grating (FBG) fabricated by femtosecond laser processing was examined to evaluate the performance as a strain sensor, compared with a conventional FBG sensor. Each FBG was affixed on a stainless-steel beam along with a strain gauge to measure the Bragg wavelength shift as a function of strain. We used the intensity of the reflection spectra from the FBGs as a weighting factor to determine the Bragg wavelengths. Although the strain sensitivity for the thermal-resistant FBG was found to be 0.34 pm/
, a measurement accuracy of 
3 was able to be achieved by employing the Bragg wavelength determination algorithm, which was comparable to a measurement accuracy of 2 for the conventional FBG sensor.
Tachibana, Yukio; Hontani, Koji*; Kojima, Takao; Takeda, Takeshi; Emori, Koichi; Saruta, Toru; Iyoku, Tatsuo; Kunitomi, Kazuhiko
JAERI-Tech 2000-026, p.61 - 0, 2000/03
JAERI-Tech-2000-026.pdf:2.18MB
no abstracts in English
Sakaba, Nariaki; Emori, Koichi; Saruta, Toru
JAERI-Tech 99-072, p.125 - 0, 1999/10
no abstracts in English
Shimada, Yukihiro; Nishimura, Akihiko; Saruta, Koichi; Tsukimori, Kazuyuki; Yoshikawa, Masanari*; Kobayashi, Takao*
no journal, ,
A Fiber Bragg Grating (FBG) sensor is a powerful method of vibration of a structure and the leading methods of carrying out modification monitoring. However, since the FBG sensor which exists now does not have high temperature resistance, use in a high temperature plant is difficult. In recent years, the micro fabrication to high embrittlement materials, such as quartz, became possible by development of ultra fast pulsed laser. We performed the non-heat laser processing to the optical fiber using femto-second pulsed laser.
Shimada, Yukihiro; Nishimura, Akihiko; Saruta, Koichi; Tsukimori, Kazuyuki; Kobayashi, Takao*
no journal, ,
Fiber Bragg Grating (FBG) is the periodic refractive-index structure in an optical fiber core, where the light of a specific wavelength is reflected. It can be used as temperature or a distorted sensor by measuring change of the reflective wavelength of FBG. We processed FBG using a Chirped Pulse Amplification titanium sapphire laser. As a result, we confirmed produced FBG had the tolerance at the high temperature. The heat-resistant FBG sensor developed using ultra-short pulse laser processing will contribute to the surveillance of power plants.
Shimada, Yukihiro; Nishimura, Akihiko; Saruta, Koichi; Tsukimori, Kazuyuki; Kobayashi, Takao*
no journal, ,
Fiber Bragg grating (FBG) sensor system is a powerful method of detecting strain and temperature of a structure, and is put in practical use widely. However, a general FBG sensor system has a fault without tolerance in high temperature. We performed the micro fabrication in the silica fiber by the point by point method using femtosecond pulse laser. As a result, we succeeded in heat-resistant creation of FBG.
Shimada, Yukihiro; Nishimura, Akihiko; Saruta, Koichi; Tsukimori, Kazuyuki; Kobayashi, Takao*
no journal, ,
The fiber Bragg grating sensor with heat-resistance in microfabrication that used the ultrafast pulse laser was produced. The sensing system optimized to the characteristic of the produced sensor was designed, produced, and the distortion of piping in a mock plant and the examination of the vibration measurement were done. The result of current development is summarized, and the development task in the future is clarified.
Ota, Yasufumi; Saruta, Koichi; Noguchi, Shotaro; Ueda, Masashi
no journal, ,
no abstracts in English
Saruta, Koichi
no journal, ,
no abstracts in English
Saruta, Koichi; Yamaguchi, Toshihiko; Ueda, Masashi
no journal, ,
no abstracts in English
Ueda, Masashi; Yamaguchi, Toshihiko; Saruta, Koichi
no journal, ,
no abstracts in English
Saruta, Koichi; Yamaguchi, Toshihiko; Ueda, Masashi
no journal, ,
Ueda, Masashi; Saruta, Koichi; Yamaguchi, Toshihiko
no journal, ,
Mizutani, Haruki; Saruta, Koichi; Kamei, Naomitsu; Muramatsu, Toshiharu
no journal, ,
no abstracts in English
Saruta, Koichi; Kamei, Naomitsu; Sato, Yuji; Muramatsu, Toshiharu
no journal, ,
Kosuge, Atsushi; Minehara, Eisuke*; Saruta, Koichi
no journal, ,
Decontamination is required when disposing of equipment contaminated by the accident at TEPCO's Fukushima Daiichi Nuclear Power Station. The decontamination method generally used at present has a problem that a large amount of secondary waste is generated. Decontamination using a laser is non-contact and can significantly suppress the generation of secondary waste. In this study, we used a method of instantly evaporating and peeling using a continuous wave fiber laser, and observed the time change of peeling of the metal surface using a high-speed camera.
Kosuge, Atsushi; Minehara, Eisuke*; Saruta, Koichi
no journal, ,
Decontamination is required when disposing of equipment contaminated by the accident at TEPCO's Fukushima Daiichi Nuclear Power Plant. The decontamination method generally used at present has a problem that a large amount of secondary waste is generated. Decontamination using a laser is non-contact and can significantly suppress the generation of secondary waste. In this study, we used a method of instantly evaporating and peeling using a continuous wave fiber laser, and observed the time change of peeling of the metal surface using a high-speed camera. Furthermore, a decontamination test was conducted using this laser decontamination method for the parts of the analyzer installed in Minamisoma City, Fukushima Prefecture, which was contaminated with radioactive substances.
