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Masuzumi, Takashi; Tsukimori, Kazuyuki; Watashi, Katsumi
no journal, ,
no abstracts in English
Masuzumi, Takashi; Tsukimori, Kazuyuki; Watashi, Katsumi
no journal, ,
no abstracts in English
Shimada, Yukihiro; Masuzumi, Takashi; Nishimura, Akihiko; Doi, Motoo*; Tsukimori, Kazuyuki
no journal, ,
We performed irreversible lattice processing into the quartz board using the technique of non-heat processing which used femtosecond laser. The heat-resistant evaluation was performed for the purpose of development of heat-resistant FBG for always supervising heat transfer system vibration and modification of a high temperature structure. As a result, the intensity ratio of diffraction light did not change but after rising temperature up to 950 
C showed that the system of heat-resistant FBG was effective as a local vibration of high temperature piping, and the distorted detection technique.
Shimada, Yukihiro; Nishimura, Akihiko; Masuzumi, Takashi; Tsukimori, Kazuyuki
no journal, ,
The FBG (Fiber Bragg Grating) sensor already put in practical use as a method of carrying out the monitoring of modification of a structure and the vibration has a fault in which the durability under high temperature environment is inferior. In order to conquer this fault, we performed the micro fabrication in the silica optical fiber by femtosecond laser, and created a heat-resistant periodic refractive-index structure.
Masuzumi, Takashi; Tsukimori, Kazuyuki; Shimada, Yukihiro; Nishimura, Akihiko
no journal, ,
Strain sensors, which can be used for integrity monitoring of plant components and piping during the operation period continuously, are effective from the point of view of proactive maintenance. FBG (Fiber Bragg Grating) sensor is one of the expective sensors and is used in various plants and civil engineering and construction fields except for high temperature service. In order to apply to the component and piping of fast reactor, heat resistance is an indispensable feature of the sensor. In this study, we tried to improve heat resistance of FBG by using femtosecond laser in the process. The heat resistance at the FBGs was examined experimentally and the results compared with those of ordinary FBGs.
Masuzumi, Takashi; Tsukimori, Kazuyuki; Shimada, Yukihiro; Nishimura, Akihiko
no journal, ,
no abstracts in English
Shimada, Yukihiro; Nishimura, Akihiko; Masuzumi, Takashi; Tsukimori, Kazuyuki; Yoshikawa, Masanari*; Kobayashi, Takao*
no journal, ,
A FBG sensor system is a very powerful method of detecting distortion 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 method using femtosecond laser. As a result, we succeeded in heat-resistant creation of existing FBG.