Temperature Dependent Study of Refractive Index at Several Wavelengths of Light Source
Abstract
Optical fiber sensors are indispensible in most of the industries starting from biochemical, mechanical, space, undersea, military, medical, food pressing, fragrant, beverages, power to oil or even scientific and consumer applications. They provide online measurement of various environmental parameters like strain, pressure, temperature, vibration, fluid level, fluid flow, rotation, current, acceleration, humidity, pH, toxic gases and many more. In the present work, a U – Shaped glass rod of dimensions equivalent to the core is connected between a light source and a light detector using a pair of PCS fibers, as a passive sensing head. The output power changes have been observed in the light injected from the source, when the sensor head is immersed in liquid mixtures taken in different proportions. The functionality of output power with change in the liquid mixture in the sensing zone is used to determine refractive index of the liquids in the range of 10oC to 60oC temperature, is robust and sturdy in nature, providing high accuracy in measurement the parameter. The operation of the sensor also has been studied at several wavelengths of the source i.e., 630nm, 660nm, 820nm, and 850nm wavelengths.
