Vibration sensing of solid using long-period fiber grating

Hiroyuki Somatomo; Satoshi Tanaka; Nobuaki Takahashi

doi:10.1117/12.785961

16 May 2008 Vibration sensing of solid using long-period fiber grating

Hiroyuki Somatomo, Satoshi Tanaka, Nobuaki Takahashi

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70042J (2008) https://doi.org/10.1117/12.785961
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

Long-period fiber gratings (LPG) are fabricated by illuminating 248 nm KrF excimer laser light to a single-mode optical fiber that is photosensitized with boron doping. By applying the intensity-modulation scheme, which is known to be effective as an interrogation method for fiber Bragg grating (FBG) vibration and underwater acoustic sensors, we construct an optical vibration sensor of a solid that uses a LPG as a sensing element. It is confirmed that the LPG vibration sensor yields a clear and stable signal waveform and shows good linearity when the amplitude of the vibration strain is varied. The dynamic range of the sensor would be more than 100 dB, which is larger than that with a FBG as a sensing element. Since a LPG is known to show higher sensitivity to static strain when one uses a higher-order cladding mode, it is expected that with proper choice of the cladding mode a LPG vibration sensor will show much higher sensitivity than a FBG vibration sensor.

Citation Download Citation

Hiroyuki Somatomo, Satoshi Tanaka, and Nobuaki Takahashi "Vibration sensing of solid using long-period fiber grating", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70042J (16 May 2008); https://doi.org/10.1117/12.785961

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