Development of low-cost optical measurement system for methanol – ethanol mixtures
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Abstract
This research presents the development of a low-cost optical measurement system for the detection of methanol in the methanol – ethanol mixtures. The developed system consists of a laser diode, photodiode, and single-board computer as light source, photodetector, and processing unit, respectively. In the experiment, the transparent adhesive tape becomes translucent tape when exposed to vapors from the methanol-ethanol mixture. The rate of change to translucent tape varies with the concentration of methanol in the mixture. It was found that both the transmitted light intensity obtained from a commercial device and the reflected light intensity obtained from a developed system decrease when the concentration of methanol in the mixtures increases. In addition, a developed system has a nonlinear response, while extending the measurement time increases the sensitivity of the system. These results show the feasibility to detect methanol in a methanol-ethanol mixture using a developed system, which is low-cost, simple, and easy to use.
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