• S. SRINIVASULU
• Dr. S. VENKATESWARA RAO

The Novel approach of present day sensors lies in their capability of determining the environmental parameters with highest possible sensitivity. This paper reports the measurement of sensitivity of an intensity modulated fiber optic sensor by varying the prong widths of a U-shaped glass rod with various diameters used as a sensing element. U-shaped borosilicate glass rod with a prong width of 17mm was connected to a light source of 630nm wavelength at one side and a Bench mark optical power meter on the other side by using 200/230 µm Step Index PCS fibers. Initially the output power was noted, when the light launched from the source which transmits through the U-shaped glass rod and coupled to the optical power meter, when the air is surrounding the glass rod. The experiment was repeated and the values of output power was tabulated by connecting the U-shaped glass rods with various prong widths in between the light source and optical detector by fixing the other geometrical parameters to remain same. At the same time the refractive index of air was taken as 1.00028 as standard value. In the second stage of experimentation, the setup with U-shaped rod was immersed in a container filled with distil water of height 25mm and output power was noted. The process was repeated by using the setup with U-shaped glass rods of different prong widths and water surrounding the glass rod. Height of the distil water surrounding the U-shaped glass rod was consider in the third stage of the experimentation. By considering the above geometrical parameters of the U-shaped glass rod, the sensitivity of the sensor was calculated and concluded that the sensor operated by offering highest sensitivity when width between two prongs is reduced and height of the immersion of liquid is increased.

Environmental Parameters, Geometrical Parameters, Height of the immersion, Prong width, Refractive Index, Sensitivity, U-shaped glass rod.

"INFLUENCE OF GEOMETRICAL PARAMETERS ON THE TRANSMISSION CHARACTERISTICS OF A U-SHAPED GLASS PROBE: DETERMINATION OF THE SENSITIVITY OF AN EXTRINSIC FIBER OPTIC REFRACTOMETER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.341-346, September-2018, Available :http://www.jetir.org/papers/JETIRA006322.pdf

"INFLUENCE OF GEOMETRICAL PARAMETERS ON THE TRANSMISSION CHARACTERISTICS OF A U-SHAPED GLASS PROBE: DETERMINATION OF THE SENSITIVITY OF AN EXTRINSIC FIBER OPTIC REFRACTOMETER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp341-346, September-2018, Available at : http://www.jetir.org/papers/JETIRA006322.pdf