Bend Sensitive Wavelength Dependent Conventional Fiber Based Weight and Pressure Sensor

Loss of optical power in a step index multimode optical fiber due to bending has been studied for visible as well as for infrared wavelength (470-1310nm). In this piece of work, the effect of bending radius and wrapping turns on loss has been observed, with respect to the mention wavelength range. Variation of bending loss has been observed with respective change in bending radius and numbers of bending turns. The variation in the results shows a good agreement with the theory. With the help of these observations of the proposed weight and pressure sensor has been designed. This study validates that the loss is a strong function of bending radius at lower wavelength regime. Therefore, the proposed sensors have been designed at wavelength 470nm that gives better sensitivity.