FBG vibration sensor based on intensity-modulation method with incoherent light

Nobuaki Takahashi; Kazuto Yoshimura; Sumio Takahashi

doi:10.1117/12.427011

8 May 2001 FBG vibration sensor based on intensity-modulation method with incoherent light

Nobuaki Takahashi, Kazuto Yoshimura, Sumio Takahashi

Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427011
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan

Abstract

A fiber Bragg grating (FBG) vibration sensor is constructed with two FBGs and an incoherent optical source. One FBG is used as a sensing element which intensity-modulates incident narrow-spectrum light, of which peak wavelength coincides with the slope in the FBG reflection spectrum curve. The narrow-spectrum light is produced by the other FBG in combination with amplified spontaneous emission output of an erbium doped fiber amplifier. Direct detection of the intensity-modulated light yields real time observation of the vibration. The developed sensor shows stable output in proportion to the vibration amplitude without using an optical isolator or fusion splicing, which are commonly used for the stabilization of FBG sensors with laser light as an optical source. Thermally stabilized operation of the sensor would be realized by keeping the temperature of both FBGs the same.

Citation Download Citation

Nobuaki Takahashi, Kazuto Yoshimura, and Sumio Takahashi "FBG vibration sensor based on intensity-modulation method with incoherent light", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); https://doi.org/10.1117/12.427011

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