Implementation of U-Shaped Probe in the Construction of a Fiber Optic Sensor to Determine the Refractive Index of Liquids in the dynamic Range of 300C to 600C

The whole nature of most of the substances is determined by the study of measurement of especially the refractive index, which decides their applicability and utility in different fields at various occasions. A uniform U-shaped glass probe of very fine dimension is shown to sense the refractive index of a liquid in which the U-shaped glass rod is immersed at various temperatures. In the present paper, the refractive index of liquids such as methanol mixed in benzene and propanol mixed in benzene was studied over a wide range of temperatures ranging between 300C to 600C using a U-shaped glass sensing probe. With increase in the temperature of the active medium surrounding the glass probe, the slope of the sensor response is found to be dramatically increased in terms of light reception. The U-shaped glass rod is sensitive to the presence of absorption at the wavelengths at which the refractive index is being measured and to the chemical nature of the solute. The output power variations in the intensity of the light with changes in the temperature ranging between 300C to 600C have been recorded. The sensor so developed can be used to determine the refractive index of liquids either transparent or dark whose refractive index values lie between 1.33nD and1.50nD and the dynamic range of temperatures between 300C to 600C at the wavelength of 633nm.