高温で計測可能な光ファイバ超音波センサの構築

• 于 豊銘

  東京大学 生産技術研究所

• 岡部 洋二

  東京大学 生産技術研究所

書誌事項

タイトル別名

• Optical fiber sensor for ultrasonic detection at high temperature

抄録

Because of the stable material property of optical fiber up to 1000℃, fiber-optic Bragg grating (FBG) sensor is considered as one of possible ultrasonic sensors used at ultrahigh temperature. However, disappearance of reflectivity of a normal FBG in the high temperature above 900℃ makes the ultrasonic detection impossible. In order to detect ultrasonic wave under high temperature environments, we conducted an anneal heat treatment to produce a regenerated fiber Bragg grating (RFBG) sensor. Because the RFBG has a stable reflectivity even at temperature of 1000℃, we detected the ultrasonic wave successfully at the temperature. Especially, because a π-phase-shifted FBG (PSFBG) was used as the seed grating, the RFBG sensor possessed very short effective gauge length that resulted in a broad bandwidth response to ultrasonic wave over 1 MHz. Hence, we believe that the ultrasonic RFBG sensors could be potentially applied for ultrasonic detection in non-destructive tests to evaluate microscopic damage in materials under extreme high-temperature environment.

収録刊行物

• 日本機械学会論文集

  日本機械学会論文集 84 (857), 17-00406-17-00406, 2018

  一般社団法人 日本機械学会

キーワード

• Regenerated fiber Bragg grating
• High tempeture
• Ultrasonic detection
• Non-destructive test
• Composite materials

詳細情報

• CRID: 1390282680492339584
• NII論文ID: 130006320946
• DOI: 10.1299/transjsme.17-00406
• ISSN: 21879761
• Web Site: https://www.jstage.jst.go.jp/article/transjsme/84/857/84_17-00406/_pdf
• 本文言語コード: ja
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