Fiber bragg grating sensor metallization and embedding into 42CrMo steel by soldering

To solve the problem of fiber bragg grating(FBG) sensor protection and embedding in metal, FBG was protected with nickel coating by using chemical and electric plating method.The metallized FBG was then embedded into 42CrMo steel successfully and a smart metal part was acquired.Experiment results show FBG was protected successfully with the nickel layer, and there were no defects at the FBG nickel layer interface.The heat did not wreak the FBG during soldering process.Temperature monitoring results show the temperature sensitivity of FBG was increased twofold after metallization and soldering, and the temperature change was linear with reflection wavelength.