金属化光纤光栅高温失效及其光谱特性

摘要

光纤光栅（FBG）作为温度传感器在智能结构领域得到广泛关注，然而将其埋入金属基体的方法大多是焊接方法。由于焊接过程经历高温，对 FBG 传感特性将产生一定不良影响。为提高 FBG 在高温工况下的应用，采用化学镀结合电镀的方法，对 FBG 进行了镀铜、镀镍金属化试验。采用高温加热炉对金属化 FBG 进行了短时间高温失效试验，分析了300～900℃区间内金属化 FBG 的温度灵敏度、光谱特性以及功率衰减规律。结果表明：在300～800℃温度区间，镀铜、镀镍的 FBG 以及裸光栅的平均温度灵敏度分别为15.35 pm ／℃、16.34 pm ／℃、16.1 pm ／℃；金属化 FBG 的失效温度约为900℃，与裸光栅相比提高了约100℃；获得了金属化 FBG 失效过程的光谱及反射峰功率衰减情况。%In order to improve the application of FBG in high temperature conditions,FBG was coated with copper and nickel by an electroless-electro plating method.The failure temperature of the metal-coated FBG was studied.During 300 ~900 °C,the temperature sensitivity,spectral characteristic and power attenuation of the metal-coated FBG were systemically analyzed.Results show:(i)the average temperature sensitivities of Cu-coated FBG,Ni-coated FBG,and bare FBG were respectively 1 5.35 pm/°C,1 6.34 pm/°C,1 6.1 pm/°C during 300 ~800 °C;(ii)the failure tempera-ture of metal-coated FBG is about 900 °C,which is 1 00 °C more than that of bare FBG;(iii)the spectral characteris-tic and power attenuation of FBG were obtained during the high temperature failure process.