Optical fiber sensing with chirped FBG Fabry-Perot interferometer: vibration measurement

K. Ikuma; A. Wada; S. Tanaka; K. Omichi; N. Takahashi

doi:10.1117/12.966349

17 October 2012 Optical fiber sensing with chirped FBG Fabry-Perot interferometer: vibration measurement

K. Ikuma, A. Wada, S. Tanaka, K. Omichi, N. Takahashi

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84213R (2012) https://doi.org/10.1117/12.966349
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A Fabry-Perot interferometer with chirped FBGs as reflectors has hundreds of resonance peeks in the transmittance spectrum and can be utilized as a sensor based on the dependency of the peak wavelengths on the influence applied to the fiber. Because the width of the peak is narrow and the number of the peak is large, one may well expect high resolution and/or large dynamic range in its operation. In this paper, we propose to use it for measuring vibration of solid. We characterize the sensor for two kinds of interrogation methods: the intensity-modulation and wavelength-sweep schemes. The sensor works well and the former scheme yields a lower minimum detectable strain while the latter gives flexibility in the magnitude of the dynamic range. In addition, difference in finesse between shorter- and longerwavelength regions allows us to design a sensor of different sensitivity by changing the operation wavelength.

Citation Download Citation

K. Ikuma, A. Wada, S. Tanaka, K. Omichi, and N. Takahashi "Optical fiber sensing with chirped FBG Fabry-Perot interferometer: vibration measurement", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84213R (17 October 2012); https://doi.org/10.1117/12.966349

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