Resurgent regenerated fiber Bragg gratings and thermal annealing techniques for ultra-high temperature sensing beyond 1400°C

Dinusha Gunawardena, On Kit Law, Zhengyong Liu, Xiaoxuan Zhong, Yuk-Ting Ho, Hwa Yaw Tam
2020 Optics Express  
We report for the first time the resurgence of regenerated fiber Bragg gratings (RFBGs) useful for ultra-high temperature measurements exceeding 1400 °C. A detailed study of the dynamics associated with grating regeneration in six-hole microstructured optical fibers (SHMOFs) and single mode fibers (SMFs) was conducted. Rapid heating and rapid cooling techniques appeared to have a significant impact on the thermal sustainability of the RFBGs in both types of optical fibers reaching temperature
more » ... ching temperature regimes exceeding 1400 °C. The presence of air holes sheds new light in understanding the thermal response of RFBGs and the stresses associated with them, which governs the variation in the Bragg wavelength.
doi:10.1364/oe.375421 pmid:32225641 fatcat:76qren2al5dkhibwgblo2pi6qe