プラスチック光ファイバ中のモード間干渉を用いた変位計測に関する水野助教・萩原（M1）らの論文が Japanese Journal of Applied Physics に掲載されました。
Y. Mizuno, S. Hagiwara, T. Kawa, H. Lee, and K. Nakamura, “Displacement sensing based on modal interference in polymer optical fibers with partially applied strain,” Jpn. J. Appl. Phys., vol. 57, no. 5, 058002 (2018).
Strain sensing based on modal interference in multimode fibers (MMFs) have been extensively studied, but no experimental or theoretical reports have been given as to how the system works when strain is applied not to the whole MMF but only to part of the MMF. Here, using a perfluorinated graded-index polymer optical fiber as the MMF, we investigate the strain sensing characteristics of this type of sensor when strain is partially applied to fiber sections with different lengths. The strain sensitivity dependence on the length of the strained section reveals that this strain sensor actually behaves as a displacement sensor.