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Proceedings Paper

A high reading rate FBG sensor system using a high-speed swept light source based on fiber vibrations
Author(s): Ryoichi Isago; Kentaro Nakamura; Sadayuki Ueha
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Paper 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.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700411 (16 May 2008); doi: 10.1117/12.785518
Show Author Affiliations
Ryoichi Isago, Tokyo Institute of Technology (Japan)
Kentaro Nakamura, Tokyo Institute of Technology (Japan)
Sadayuki Ueha, Tokyo Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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