Mesonero-Santos Patricia, Fernández-Medina Ana, Coelho Luis C C, Viveiros Duarte, Jorge Pedro A, Belenguer Tomás, López Heredero Raquel
Space Optics Department, National Institute for Aerospace Technology (INTA), Carretera de Ajalvir km 4, 28850 Torrejón de Ardoz, Spain.
Department of Physics and Astronomy of Faculty of Sciences, INESC TEC-Institute for Systems and Computer Engineering, Technology and Science and Faculty for Sciences, University of Porto, 4169-007 Porto, Portugal.
Sensors (Basel). 2021 Mar 26;21(7):2318. doi: 10.3390/s21072318.
This work presents an experimental study on the effects of gamma radiation on Long Period Fiber Gratings (LPFGs) in a low-dose test campaign to evaluate their eventual degradation. The study was carried out with standard single-mode fibers where the grating was inscribed using the Electric-Arc Discharge (EAD) technique. Before the gamma campaign, a detailed optical characterization was performed with repeatability tests to verify the accuracy of the setup and the associated error sources. The gamma-induced changes up to a dose of 200 krad and the recovery after radiation were monitored with the Dip Wavelength Shift (DWS). The results show that the gamma sensitivity for a total dose of 200 krad is 11 pm/krad and a total DWS of 2.3 nm has been observed with no linear dependence. Post-radiation study shows that recovery from radiation-induced wavelength shift is nearly complete in about 4000 h. Experimental results show that the changes suffered under gamma irradiation of these LPFGs are temporary making them a good choice as sensors in space applications.
这项工作展示了一项关于伽马辐射对长周期光纤光栅（LPFG）影响的实验研究，该研究在低剂量测试活动中开展，以评估其最终的降解情况。该研究使用标准单模光纤进行，其中光栅采用电弧放电（EAD）技术写入。在伽马辐射实验之前，进行了详细的光学表征及重复性测试，以验证装置的准确性和相关误差源。通过波长偏移（DWS）监测了高达200千拉德剂量的伽马辐射引起的变化以及辐射后的恢复情况。结果表明，200千拉德总剂量的伽马辐射灵敏度为11皮米/千拉德，并且观察到总波长偏移为2.3纳米，不存在线性相关性。辐射后研究表明，在大约4000小时内，辐射引起的波长偏移几乎完全恢复。实验结果表明，这些LPFG在伽马辐射下所遭受的变化是暂时的，这使其成为空间应用中传感器的良好选择。
