Refractive Index of Oils Measurement by Using Fiber Optics

In this research, fiber optics (FO) of type Plastic Clad Plastic (PSP) is used as sensor to measure refractive index of oils, lens oil and machine oil. Hadrolic and automobiles oils are not used because the impurities they have. Fiber optics is used to measure the change of refractive index of lens oil and machine oil with the temperature variations and compared the results with those measured by Abbe Refractometer the results were in good agreement .The fiber - fiber coupling technique is used in this project as a sensor to measure the change of refractive index of lens oil and machine oil with the change of temperature.