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Nishimura, Akihiko; Takenaka, Yusuke*; Furuyama, Takehiro*; Shimomura, Takuya; Terada, Takaya; Daido, Hiroyuki
Journal of Laser Micro/Nanoengineering, 9(3), p.221 - 224, 2014/11
Times Cited Count：0 Percentile：0(Nanoscience & Nanotechnology)Heat resistant FBG sensors were developed by femtosecond laser processing to apply them to high temperature operated piping system of nuclear power plants. The FBG sensor was installed on the surface of a steel blade and a vibration test was conducted to detect the resonant vibration frequency of the vibrating blade. The FBG sensor had the heatproof performance at 600
C. A frequency stabilized sensing system using a tunable laser was tested for structural health monitoring in daily operation of nuclear power plants. The FBG sensor was installed on the surface of a steel blade for vibration induced strain measurements. Welding, brazing, soldering and noble metal powder adhesive were discussed for molding the FBG sensors.
Nishimura, Akihiko; Terada, Takaya; Takenaka, Yusuke*; Furuyama, Takehiro*; Shimomura, Takuya
Proceedings of 22nd International Conference on Nuclear Engineering (ICONE-22) (DVD-ROM), 6 Pages, 2014/07
Since 2007, JAEA has been developing laser based technologies of structural health monitoring. The FBG sensor made by femtosecond laser processing will be the best candidate. To make the best use of the heat resistant characteristic, the FBG sensor was embedded in metal mold by laser cladding. A groove was processed to the surface of a SUS metal plate. We used a QCW laser to weld a filler wire on the plate. A series of weld beads perfectly formed a sealing clad on the groove. Though the FBG sensor was buried tightly, no degradation on the reflection spectrum was detected after the processing. The FBG sensor could detect the vibration of the plate caused by impact shocks and audio vibration. The reflection peak of the FBG sensor under laser cladding condition was shifted to be 6 nm. We demonstrated that the corresponded temperature derive from the reflection peak shift reached 600 degrees in heat shock experiments. The installation procedure of a FBG sensor using a portable laser cladding machine was described.
Kumada, Takayuki; Karavitis, M.*; Goldschleger, I. U.*; Apkarian, V. A.*
Hoshasen Kagaku, (79), p.30 - 35, 2005/03
We should know how the high energy deposited by irradiation dissipates in materials in order to understand radiation chemical processes. In this study, we carried out TR-CARS (Time-Resolved Coherent Anti-Stokes Raman Scattering) study of molecular iodine in solid krypton to understand the mechanism of vibrational relaxation in solid phase. Decoherence of the vibrational state is due to energy dissipation below 10 K whereas pure dephasing plays an important role above. We also found that the dephasing is due to the scattering with local phonon mode with the energy of 40 K.
(v = 1-19) in solid KrKaravitis, M.*; Kumada, Takayuki; Goldschleger, I. U.*; Apkarian, V. A.*
Physical Chemistry Chemical Physics, 7(5), p.791 - 796, 2005/02
Times Cited Count：30 Percentile：69.43(Chemistry, Physical)Energy dissipation and phase relaxation of the vibrational quantum states of iodine molecules in solid krypton have been studied in the temperature range between 7 and 45 K using a technique of time-resolved coherent anti-stokes Raman scattering (CARS) spectroscopy by a femto-second laser. The rate of energy dissipation was independent of tempeature, but proportional to the vibrational quantum number v. The pure dephasing rate exponentially increased with an increase in temperature and was proportional to v
. The energy relaxation was found to take place by transfering the vibrational energy of iodine to four phonons in the krypton solid. The pure dephasing was induced by elastic scattering with phonon. It was suggested by a computer simulation that the phonon which induced the pure dephasing accompanied libration mode of iodine molecules.
Daido, Hiroyuki
Reza Kenkyu, 31(11), p.696 - 697, 2003/11
no abstracts in English
Daido, Hiroyuki
Reza Kenkyu, 31(11), p.698 - 706, 2003/11
no abstracts in English
Nagashima, Keisuke; Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Sukegawa, Kota*; Namba, Shinichi; Tang, H.; Daido, Hiroyuki; Kato, Yoshiaki
Purazuma, Kaku Yugo Gakkai-Shi, 78(3), p.248 - 255, 2002/03
no abstracts in English
Kato, Yoshiaki; Daido, Hiroyuki; Nagashima, Keisuke; Kawachi, Tetsuya; Hasegawa, Noboru; Tanaka, Momoko; Tang, H.; Tai, R.; Lu, P.; Kishimoto, Maki; et al.
AIP Conference Proceedings 641, p.31 - 39, 2002/00
no abstracts in English
Nagashima, Keisuke; Koga, J. K.; Kando, Masaki
Physical Review E, 64(6), p.066403_1 - 066403_4, 2001/12
Times Cited Count：12 Percentile：50.69(Physics, Fluids & Plasmas)no abstracts in English
Sasaki, Akira; Utsumi, Takayuki*; Moribayashi, Kengo; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Kawachi, Tetsuya; Daido, Hiroyuki
Journal of Quantitative Spectroscopy & Radiative Transfer, 71(2-6), p.665 - 674, 2001/10
Times Cited Count：9 Percentile：46.28(Optics)no abstracts in English
Auguste, T.*; Faenov, A. Y.*; Fukumoto, Ichiro; Hulin, S.*; Magunov, A. I.*; Monot, P.*; D'Oliveira, P.*; Pikuz, T. A.*; Sasaki, Akira; Sharkov, B. Y.*; et al.
Journal of Quantitative Spectroscopy & Radiative Transfer, 71(2-6), p.147 - 156, 2001/10
Times Cited Count：14 Percentile：57.94(Optics)no abstracts in English
Sasaki, Akira; Utsumi, Takayuki*; Moribayashi, Kengo; Zhidkov, A. G.; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Kawachi, Tetsuya
Journal de Physique, IV, 11(Pr2), p.Pr2_75 - Pr2_78, 2001/07
no abstracts in English
Kato, Yoshiaki
Kogaku, 29(5), p.279 - 286, 2001/05
no abstracts in English
Hosokai, Tomonao; Kando, Masaki; Dewa, Hidenori; Kotaki, Hideyuki; Kondo, Shuji; Hasegawa, Noboru; Kanazawa, Shuhei; Nakajima, Kazuhisa*; Horioka, Kazuhiko*
Denki Gakkai Rombunshi, A, 120(5), p.575 - 582, 2000/05
no abstracts in English
Zhidkov, A.*; Sasaki, Akira; Tajima, Toshiki*
Physical Review E, 61(3), p.R2224 - R2227, 2000/03
Times Cited Count：44 Percentile：83.29(Physics, Fluids & Plasmas)no abstracts in English
Zhidkov, A. G.; Sasaki, Akira; Tajima, Toshiki*
Review of Scientific Instruments, 71(2), p.931 - 934, 2000/02
Times Cited Count：9 Percentile：52.82(Instruments & Instrumentation)no abstracts in English
Zhidkov, A. G.*; Sasaki, Akira; Tajima, Toshiki*; T.Auguste*; D'Olivera, P.*; S.Hulin*; P.Monot*; A.Y.Faenov*; T.A.Pikuz*; I.Y.Skoblev*
Physical Review E, 60(3), p.3273 - 3278, 1999/09
Times Cited Count：62 Percentile：88.8(Physics, Fluids & Plasmas)no abstracts in English
Zhidkov, A.*; Sasaki, Akira
Physical Review E, 59(6), p.7085 - 7095, 1999/06
Times Cited Count：23 Percentile：67.8(Physics, Fluids & Plasmas)no abstracts in English
B.N.Chichkov*; A.Egbert*; S.Meyer*; B.Wellegehausen*; L.Aschke*; H.Kunze*; Kato, Yoshiaki
Japanese Journal of Applied Physics, Part 1, 38(4A), p.1975 - 1978, 1999/04
Times Cited Count：13 Percentile：53.04(Physics, Applied)no abstracts in English
Sasaki, Akira; *; Moribayashi, Kengo*; Kado, Masataka; Hasegawa, Noboru; Tajima, Toshiki*; *
Inst. Phys. Conf. Ser., (159), p.387 - 390, 1999/00
no abstracts in English
