A high reading rate FBG sensor system using a high-speed swept light source based on fiber vibrations

Ryoichi Isago; Kentaro Nakamura; Sadayuki Ueha

doi:10.1117/12.785518

16 May 2008 A high reading rate FBG sensor system using a high-speed swept light source based on fiber vibrations

Ryoichi Isago, Kentaro Nakamura, Sadayuki Ueha

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 700411 (2008) https://doi.org/10.1117/12.785518
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

We propose a fiber Bragg grating (FBG) sensor array system using a high-speed swept light source. The light source is an external cavity semiconductor laser using an optical fiber coupling with a Littrow-mounted grating spectroscope, where the fiber end is vibrated in the cantilever bending mode using a piezoelectric transducer. The incident angle to the grating is scanned at ultrasonic frequency, and the output wavelength is swept according to the vibration displacement amplitude. The maximum sweep rate of 167 kHz was achieved for the sweep range of 70 nm. In this report, the light source is used for high speed and high sensitivity FBG sensor interrogation. First, to test the operation of the proposed FBG sensor, the center wavelength variation due to temperature shift is measured in water. Second, we experimentally demonstrate the measurements of dynamic strain oscillating at 10 kHz. The observation of high frequency vibration is achieved with a sufficient sampling rate.

Citation Download Citation

Ryoichi Isago, Kentaro Nakamura, and Sadayuki Ueha "A high reading rate FBG sensor system using a high-speed swept light source based on fiber vibrations", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700411 (16 May 2008); https://doi.org/10.1117/12.785518

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