Celikin Mert, Barba David, Bastola Binod, Ruediger Andreas, Rosei Federico
Opt Express. 2016 Sep 19;24(19):21897-909. doi: 10.1364/OE.24.021897.
The effect of annealing cycle on regeneration efficiency was investigated through isothermal treatments between 700 and 1000°C. We determined an inverse relationship between the recovery rate of the peak reflectivity and temperature. A regeneration efficiency of 85.2% and long-term stability at 1000°C for 500 hours were achieved via a slow regeneration process. Thermal sensors developed by isothermal regeneration were determined to be reliable up to 1000°C (±2 °C). Experimental findings suggest the involvement of both diffusion related phenomena and stress variation through densification of the fiber core in type-I FBG during the thermal regeneration process.
通过在700至1000°C之间进行等温处理，研究了退火循环对再生效率的影响。我们确定了峰值反射率的恢复率与温度之间呈反比关系。通过缓慢再生过程，实现了85.2%的再生效率以及在1000°C下500小时的长期稳定性。经测定，通过等温再生开发的热传感器在高达1000°C（±2°C）的温度范围内是可靠的。实验结果表明，在热再生过程中，I型光纤布拉格光栅（FBG）的热再生过程涉及与扩散相关的现象以及通过纤芯致密化产生的应力变化。
