环氧树脂掺金属粉末嵌入式FBG封装技术研究

Study on the Embedment Encapsulation Technique of Epoxy Resin Mixed with Metal Powder of Fiber Bragg Grating

针对光纤光栅(FBG)与被测金属构件可靠连接问题,提出环氧树脂掺金属粉末嵌入式封装技术,阐明了该封装工艺,采用纯弯曲梁对裸光纤光栅和封装后的光纤光栅分别进行应变实验,结果表明,经环氧树脂掺金属粉末封装后的光纤光栅传感器应变灵敏度是裸光纤光栅的1.3倍,达到1.53pm/με,具有很好的重复性,该方法提高了嵌入光纤光栅后被测金属构件的机械强度。

The embedment encapsulation technique of epoxy resin mixed with metal powder is advanced in consideration of the problem of the fiber Bragg grating（FBG） sensor reliably joining with the detected metal object. The encapsulation technics is illuminated. Pure curving girder is used to carry out a strain experiment in bare FBG and encapsulated FBG respectively. It is indicated by experiment,that the strain sensitivity coefficients of FBG encapsulated by epoxy resin mixed with metal powder is 1.3 times of bare FBG, reaching to 1.53pm/με,and the reproducibility of experiments is very well. The mechanical intension of the detected metal object is enhanced after FBG embedded by this method.