Application of U-Shaped hybrid fiber optic sensor to determine the temperature dependent variation of refractive index of binary liquids

• Published in: Materials today : proceedings Vol. 51; pp. 31 - 37
• Main Authors: Srinivasulu, S., Venkateswara Rao, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2022
• Subjects: Dynamic range; Light source of 660nm wavelength; Multimode PCS fibers; Refractive index; Sensing zone; Temperature range of 10 °C to 60 °C; Dynamic range; Temperature range of 10 °C to 60 °C; Multimode PCS fibers; Light source of 660nm wavelength; Refractive index; Sensing zone
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2021.04.358

The study of refractive index of liquids becoming increasingly popular in diverse areas to monitor chemical, pharmaceutical, food, scientific, biochemical, medical, etc. processes and procedures. In the present paper a low cost, simple, compact, reliable, robust, miniaturized and sturdy Refractive Index sensor is reported. It is configured by using a set of two multimode PCS fiber of 50 cm length in each, connected one to the source of wavelength 660 nm and other to a light detector. A glass rod drawn in the form of ‘U’, of compatible dimensions to that of two multimode fibers, was connected between source and detector by jointing to the remaining ends of the fibers, thus creating a sensing zone. Maintaining the binary liquids of Toluene and t-Butanol at the sensing zone at various temperatures, the light launched from source was monitored in the detector at the detector end. By forming relationship between index of refraction and power output at the temperature range of 10 °C to 60 °C, the sensor expected to be used to detect the index of refraction of liquids with maximum resolution of the order of 10-5 in the operating range from 1.36312nD to 1.50915nD.