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Proceedings Paper

High performance interrogation of long period fiber grating sensor with wavelength scanning and Fourier analysis
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Paper Abstract

A long-period fiber grating (LPG) sensor is interrogated with the wavelength-to-time mapping scheme. Highspeed scanning of the laser light source wavelength generates a train of optical dark pulses in the transmitted light through the LPG whose peak position is modulated according to the wavelength change caused by the environmental influence. The generated dark pulses are Fourier-analyzed and the information on the wavelength shift is retrieved. The result in the temperature sensing shows the linearity of the sensor system and the validity of the interrogation scheme is verified. The scheme can be also applied to the sensing of the dynamic influence. With 20 kHz scanning frequency, dynamic influence of up to 10 kHz is expected to be interrogated. Utilizing the characteristic advantage that a LPG can be tailored to be of higher or less sensitivity to the influence, the proposed method can be expected to yield high performance operation of a LPG sensor.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536K (17 May 2011); doi: 10.1117/12.885046
Show Author Affiliations
Atsushi Wada, National Defense Academy (Japan)
Satoshi Tanaka, National Defense Academy (Japan)
Nobuaki Takahashi, National Defense Academy (Japan)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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