Analysis of FBG weight sensor based on laser diode transitive response

An analysis of Fiber Bragg Grating (FBG) sensor for measuring weight is presented here. In the design, FBG was bonded on the cantilever structure using insulating tape. The cantilever structure was loaded with a measurable object, and the transmitted intensity of laser diode was measured. In this study, we used tunable laser controller set to 1554.194 nm and uniform FBG with a center wavelength of 1554 nm. We also used a power meter to measure the intensity. The change in the transmitted intensity of laser diode was found linear, and it showed a repeatable pattern. The results showed that during the loading and unloading of the cantilever structure, the intensity response was detected almost the same for each load. Hence, the results confirmed that the sensor is free of hysteresis.