Advanced fabrication and calibration of high-temperature sensor elements based on sapphire fiber Bragg gratings

Tino Elsmann; Tobias Habisreuther; Manfred Rothhardt; Reinhardt Willsch; Hartmut Bartelt

doi:10.1117/12.2059182

2 June 2014 Advanced fabrication and calibration of high-temperature sensor elements based on sapphire fiber Bragg gratings

Tino Elsmann, Tobias Habisreuther, Manfred Rothhardt, Reinhardt Willsch, Hartmut Bartelt

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91572N (2014) https://doi.org/10.1117/12.2059182
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

In this paper, improved fabrication and calibration techniques of Fiber Bragg Gratings (FBG) for very high temperature sensing applications up to more than 1500 °C will be presented. The fibers used are single crystalline sapphire fibers, which are applicable in such high temperature ranges due to their high melting point at 2040 °C and their extreme thermal stability. The inscription of the FBGs was performed by the second harmonic wave of a Ti:Sa-femtosecond laser system. With pulses of 400 nm wavelength first order gratings could be achieved. Using a two-beam phase mask interferometer, grating arrays within a wide spectral range have been fabricated with only one phase mask and without additional calibration routine. The inscribed grating arrays were wavelength-calibrated using a reference FBG, and their temperature sensitivity was evaluated.

Citation Download Citation

Tino Elsmann, Tobias Habisreuther, Manfred Rothhardt, Reinhardt Willsch, and Hartmut Bartelt "Advanced fabrication and calibration of high-temperature sensor elements based on sapphire fiber Bragg gratings", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91572N (2 June 2014); https://doi.org/10.1117/12.2059182

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