광섬유의 브릴루앙 산란을 이용한 복합소재 외팔보의 변형율 측정

The application of light weight technology using composite in railway structure is actively being realized for the purpose of speed improvement, guarantee of safety, reduction of fuel, improvement of maintenance and etc. Especially, the application of composite to Korean tilting train, light weight train and low floor bus is now generalized and the research of applying the composite to special structure, such as core structure like bogie and the crash absorption equipment, is also being in progress. In this paper, longitudinal strain distribution of composite cantilever beam was measured applying the optical fiber sensors that uses the BOCDA (Brillouin Optical Correlation Domain Analysis) techniques. The 5mm thickness test specimen was fabricated by laminating the glass/epoxy prepreg and curing in the autoclave and the longitudinal strain was measured by increasing the loading from 200g to 2000g at 350㎜ length cantilever. At this moment, the spatial resolution was about 9mm and the strain error was ±20 μe.