論文
FBG センサによる高温環境下原子炉配管変形計測用 歪み・温度モニタリング技術の開発
著者:
小林 喬郎,Takao KOBAYASHI,猿田 晃一,Koichi SARUTA,福元 謙一,Ken-ichi FUKUMOTO
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Abstract : A new technique of temperature and strain measurement using fiber Bragg grating (FBG) optical fiber sensor at high temperature in irradiation environment was proposed, in which interrogation of FBGs is carried out based on optical time-domain reflectometry (OTDR). Heating test results showed that stable temperature measurement can be done at 600°C and the reflectance of FBG can be kept constant up to 1000°C. From the strain measurement test on a cantilever, multi-point strain measurement c...
英字タイトル:
Development of the FBG sensor for strain and temperature monitoring of high-temperature pipelines of nuclear power reactors
第13回
ナトリウム工学研究施設における高速炉の保全技術開発
著者:
上田 雅司,Masashi UEDA,山口 智彦,Toshihiko YAMAGUCHI,猿田 晃一,Koichi SARUTA
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The Sodium Engineering Research Facility was constructed next to the MONJU site to conduct R&Ds such as sodium handling technology, maintenance technology, safety related research and so on. This facility also supports safety and stable operation of the MONJU and is expected to be a foothold of regional and international collaboration between academia and industry. In this paper, overview of this facility and specifications of test equipment will be explained. Also the research program related to main...
英字タイトル:
R&D Program of Maintenance Technologies for the Fast Reactors in the Sodium Engineering Research Facility
論文
レーザ干渉計を用いた非接触 AE 法による 軸受の欠陥計測
著者:
大田 恭史,Yasufumi OHTA,猿田 晃一,Koichi SARUTA
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Abstract: In order to investigate the relationship between the defect size and the corresponding AE parameters, we carried out laboratory tests using a rotating machine and bearing specimens. The rotational speed is 837 rpm and the size of defect diameter of the specimens ranges from 0.25 mm to 1.00 mm, in 0.25 mm steps. AE signals caused from interaction between balls and defects are measured at the rotating shaft using a laser interferometer and also measured on the bearing housing by a piezoelectri...
英字タイトル:
Defects measurement of bearings by non-contact acoustic emission method using a laser interferometer
第6回
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
著者:
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
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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 ...
英字タイトル:
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
第6回
超短パルスレーザーによるFBG センサの製作と性能評価
著者:
島田 幸洋,Yukihiro SHIMADA,西村 昭彦,Akihiko NISHIMURA,猿田 晃一,Koichi SARUTA,月森 和之,Kazuyuki TSUKIMORI,小林 喬郎,Takao KOBAYASHI
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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 te mperature 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, the peak intensity of reflective spectrum has been successfully improved from -40 dB to -24 dB. Heating test under operational temperature of Fast Breeder React...
英字タイトル:
Fabrication and performance assessment of FBG sensor with pulse laser processing