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

Atsushi Wada; Satoshi Tanaka; Nobuaki Takahashi

doi:10.1117/12.885046

17 May 2011 High performance interrogation of long period fiber grating sensor with wavelength scanning and Fourier analysis

Atsushi Wada, Satoshi Tanaka, Nobuaki Takahashi

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77536K (2011) https://doi.org/10.1117/12.885046
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

Citation Download Citation

Atsushi Wada, Satoshi Tanaka, and Nobuaki Takahashi "High performance interrogation of long period fiber grating sensor with wavelength scanning and Fourier analysis", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536K (17 May 2011); https://doi.org/10.1117/12.885046

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