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SnO2 Thin Film Coated Fiber Optic VC Sensor based on Intensity Modulation Technique

In this work, an evanescent wave-based fiber-optic sensor is developed utilizing tin oxide (SnO2) as the sensing layer for detecting volatile Compounds (VC). The optical and morphological characteristics of the proposed SnO2 layer are investigated using an ellipsometer and Scanning Electron Microscope (SEM). VCs such as acetone, ammonia, and ethanol was chosen in the present investigation, and their sensing characteristics are probed with a concentration range of 0-300 ppm. The experimental results illustrate the proposed sensor exhibits maximum sensor response towards ammonia with optimum linearity than other VCs. The sensor’s maximum sensor response and sensitivity towards ammonia are 13.5 % @ 300 ppm and 20.3 counts/ppm, respectively. Further, the prototype of the proposed sensor is developed, and its output characteristics are analyzed in terms of current.