Light Intensity Characterization of Plastic Optical Fiber as Gasoline and Diesel Vapor Sensor Bakti Dwi Waluyo (a*), Mega Silfia Dewy (a)
a) Department of Electrical Engineering Education, Universitas Negeri Medan, Medan, 20221, Indonesia
*bakti_dw[at]unimed.ac.id
Abstract
This research produces plastic fiber optic sensors to detect gasoline and diesel vapors. The sensor consists of a single-mode optical fiber which has removed the original 3 cm long cladding in the center and replaced with Stannic Oxide (SnO2). The modified cladding coated with SnO2 can produce attenuation changes at the core and cladding boundaries (evanescent field). This attenuation change is in line with changes in light intensity when interacting with gasoline vapors and diesel steam. The optical fiber sensor can respond to the concentration of gasoline vapors, with the most optimal sensor sensitivity value being 0.0821 volts / degrees Celsius at 50 ppm. At the same time, the response to diesel steam has a sensitivity value of minus 0.0262 volts/ degrees Celsius at a concentration of 50 ppm. There is a difference in the response of the fiber optic sensor when interacting with gasoline and diesel vapor. When interacting with gasoline vapors, the higher the vapor concentration, the less light intensity received by the OTDR. The higher the concentration of diesel vapor given, the more light intensity received by the OTDR.
Keywords: fiber optic sensor- gasoline and diesel vapor- light intensity
