耐熱FBG を用いた高速炉プラント健全性監視システムの開発：耐熱FBG のひずみ計測性能評価
Development of a health monitoring system using a thermal-resistant fiber Bragg grating for fast reactor power plants: performance evaluation of a thermal-resistant FBG for strain measurement
猿田 晃一 Koichi SARUTA 月森 和之 Kazuyuki TSUKIMORI 島田 幸洋 Yukihiro SHIMADA 西村 昭彦 Akihiko NISHIMURA 小林 喬郎 Takao KOBAYASHI
fast reactorfiber Bragg gratinghealth monitoringhigh temperaturenuclear power plantstrainstructural integrity
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 se nsor. 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 spe ctra 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/u?, a measurement accu racy of 13 u? was able to be achieved by employing the Bragg wavelength determination algorithm, which was comparable to a measurement accuracy of +2 u? for the conventional FBG sensor.