An Intrinsic Sensitivity Calibration Scheme for High Temperature Measurements Using Femtosecond Point-by-point Written Fiber Bragg Gratings
OPTICS AND LASER TECHNOLOGY（2024）
Univ Paris Saclay
Abstract
A calibration method is presented for temperature measurements using fiber Bragg grating transducers written with the point-by-point technique and femtosecond laser impulsions in silica optical fibers. This method is based on the determination of the wavelength-independent thermal sensitivity coefficients of the waveguide over the temperature range of interest. The calibration law is calculated using the wavelength comb-like spectrum of high order fiber Bragg gratings, allowing measurement accuracy comparable to type N thermocouples up to 900°C. The effects of thermal cycling and annealing on measurement errors are also discussed.
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Key words
Fiber Bragg gratings,Femtosecond lasers,Temperature measurement,Calibration,Harsh environments,Structural health monitoring
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