Study on the sensing characteristics of fiber Bragg grating packaged by aluminum alloy slice

The aluminum alloy slice packaging technique for fiber Bragg grating(FBG) sensor was developed to solve the problems on surface sticking FBG sensors such as large packaging volume and inconvenient surface sticking.Then the strain and temperature sensing properties of the aluminum alloy slice packaged FBG has been experimentally studied on cantilever beam and hot water.The experimental results indicate that the sensitivity coefficients of aluminum alloy slice packaged FBG sensor are 1.407 pm/μe in strain and 29 pm/℃ in temperature,which are approximately 1.2 times in strain and 3.02 times in temperature as much as that of bare FBG sensors,the shifts of center wavelength of packaged FBG are in good linear relationship with tensile force and temperature,and the reproducibility of experiments are also well.