Optical vibration sensor using FBG Fabry-Perot interferometer with wavelength scanning and Fourier analysis

Atsushi Wada; Satoshi Tanaka; Nobuaki Takahashi

doi:10.1117/12.866293

8 September 2010 Optical vibration sensor using FBG Fabry-Perot interferometer with wavelength scanning and Fourier analysis

Atsushi Wada, Satoshi Tanaka, Nobuaki Takahashi

Author Affiliations +

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 765313 (2010) https://doi.org/10.1117/12.866293
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

Abstract

An in-fiber Fabry-Perot interferometer with fiber Bragg grating mirrors (FBG-FPI) yields extremely narrow transmission peaks within the FBG reflection wavelength range. Periodical scanning of the laser light source wavelength produces a train of optical pulses and the occurrence time of the pulse is modulated as the FBG-FPI is under influence of strain. When dynamic strain due to mechanical vibration is applied to the FBG-FPI, the detected signal of the pulse train is Fourier transformed and processed to reproduce the waveform of the vibration-induced strain. A high signal-to-noise ratio interrogation is possible with high resolution and a wide range of vibration frequency can be analyzed since the laser wavelength can be easily scanned at high frequency. Furthermore, an inexpensive DFB laser can be utilized as a light source because the narrowness of the transmission peaks does not require broad wavelength scanning.

Citation Download Citation

Atsushi Wada, Satoshi Tanaka, and Nobuaki Takahashi "Optical vibration sensor using FBG Fabry-Perot interferometer with wavelength scanning and Fourier analysis", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 765313 (8 September 2010); https://doi.org/10.1117/12.866293

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