Optimization analysis of a bend enhanced curvature fiber optic sensor

A quantitative model for a light intensity modulation type fiber optic sensor that can detect curvature directly using bend enhanced method and can distinguish either positive bending or negative bending, is presented. Based on the model, the modulation sensitivity of light intensity is described, and the relationship among light loss, parameters of sensitive zone, and bending curvature is derived. Experimental results have demonstrated that the proposed model can provide a quantitative optimal scheme for the sensors.