不同反射率光纤光栅再生过程及温度特性研究

2018-07-16

作者：丁旭东1，张钰民1，骆飞1，祝连庆1，2，3 单位：1北京信息科技大学光电信息与仪器北京市工程研究中心；2现代测控技术教育部重点实验室；3北京信息科技大学光电测试技术北京市重点实验室

摘要：针对再生光栅在高温退火后存在较低反射率导致高温测量受限的问题，采用244nm氩离子激光制作两支栅区长度分别为10mm和25mm的种子光栅，使用超高温箱式炉对种子光栅进行900℃的快速高温退火处理。在擦除初始种子光栅后制备出高温再生光栅，并在200℃-900℃温度范围内对高温退火后的两支再生光栅的高温传感特性进行实验测试。结果表明：在900℃温度稳定环境中测试100min，10mm再生光栅中心波长的稳定度为4pm，反射率为19.03%；25mm再生光栅中心波长的稳定度为8pm，反射率高达84.13%；在200-900℃温度范围内，两支再生光栅温度线性度较好，相关系数均在0.998以上；温度灵敏度系数分别为15.23pm/℃和15.24pm/℃；栅区长度为25mm的再生光栅更适合用于制作高温传感器。

关键词：再生光栅；高温退火；反射率；温度灵敏度；透射深度

中图分类号：TG806；TH741；TN253文献标志码：A

Study on Regeneration Process and Temperature Characteristics of Fiber Grating with Different Reflectivity

Ding Xudong，Zhang Yumin，Luo Fei，Zhu Lianqing

Abstract:In this paper，the regenerated grating has the lower reflectivity after high temperature annealing，which limits the application of high temperature measurement.Two regenerated seed gratings are fabricated by using 244nm Ar+ laser，with the grating length of 10mm and 25mm respectively.The seed gratings are annealed at 900℃ in the ultrahigh temperature boxtype furnace，and the high temperature regenerative gratings occurr after the initial seed gratings are vanished.The high temperature sensing characteristics of two regenerated gratings after high temperature annealing are tested under the condition of 200℃-900℃.The results show that the center wavelength shift of the 10mm regenerative grating is 4pm with the reflectivity of 19.03%；the center wavelength shift of the 25mm regenerative grating is 8pm with the reflectivity of 84.13%，both of them are in a stable temperature environment with 100 min at 900℃.The linearity of the two nonencapsulated regenerative grating sensors is better，when correlation coefficients are both above 0.998 at 200℃-900℃，and the temperature sensitivity coefficients are 15.23pm/℃ and 15.24 pm/℃ or so.The regenerative grating with a grating length of 25mm is more suitable for packaging high temperature sensors.

Keywords:regenerated grating；high temperature annealing;reflectivity；temperature sensitivity；transmission depth