Fiber Optics Refractive Index Sensor based on Intensity Modulation

Refractive index (RI) of substance, liquid is an imperative optical measure since it possesses the optical property of substance and liquid. Efficient and accurate method of determining the refractive index of transparent liquids plays a significant role in developing optical instruments that are also paramount for chemical research, food, beverage, pharmaceutical and medical applications. Measurement of the refractive index is a basic precondition for various processes as well. We have done a regressive review on the work done in fiber optics based RI sensor in terms of fabrication, sensing region and application areas. The main aim behind this is to propose an intensity modulation based fiber optics RI sensor. We have developed an optical test bench which will take care of intensity stabilization for light source. We tried to propose sensor which will be inexpensive, tiny, can give high sensitivity and repeatability.