High-Temperature Strain Sensing Using Sapphire Fibers With Inscribed First-Order Bragg Gratings


Strain sensor styles and strain measurements based on single-crystal sapphire fibers with inscribed 1st-order fiber Bragg gratings for applications up to 60zero °C are presented. We tend to report on all the details of 2 different sensor designs; for instance, we show that the resolution of multimode sapphire fiber Bragg grating (SFBG) strain sensors is regarding $Deltal/l=10^-5$ (10 $mutextstrain$), which is comparable with state-of-the-art high-temperature sensors. We tend to apply our sensors for the determination of the thermal expansion coefficients of high-temperature steel alloys, showing a good match to known values. Hence, we believe that SFBG sensors could represent a promising different to currently used non-optic-based mostly strain-detecting devices.

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