An interrogator for FBG sensors using an ultrasonically induced long-period optical fiber grating

Norimichi Fukuma; Kentaro Nakamura; Sadayuki Ueha

doi:10.1117/12.624269

23 May 2005 An interrogator for FBG sensors using an ultrasonically induced long-period optical fiber grating

Norimichi Fukuma, Kentaro Nakamura, Sadayuki Ueha

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.624269
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

An ultrasonically induced long-period fiber grating (U-LPFG) functions as a tunable notch filter, since its refractive index modulations are made by the bending vibration propagating along the fiber and the pitch can be changed by the ultrasonic frequency. In this report, we consider the application of the U-LPFG for FBG sensor interrogator. If the ULPFG is connected to the FBG sensor output and the ultrasonic frequency is swept linearly, the FBG center wavelength can be found as the ultrasonic frequency which gives the minimum output. To demonstrate the validity of the proposed method, we try to interrogate an FBG temperature sensor as an example. A weighted mean calculation is introduced to determine the exact center wavelength, and the accuracy of 0.13 nm was obtained.

Citation Download Citation

Norimichi Fukuma, Kentaro Nakamura, and Sadayuki Ueha "An interrogator for FBG sensors using an ultrasonically induced long-period optical fiber grating", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.624269

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