Rum adulteration detection using an optical fiber sensor based on multimodal interference (MMI)
2013
In this work, we propose and demonstrate the fabrication of an optical fiber sensor based on
multimode interference effects (MMI) for rum quality control. The operation of the sensor relies on
the fact that when rum is adulterated, which can be done either with ethanol or ethylene glycol, the
refractive index (RI) of the adulterated rum will be different as compared to the original rum. Since
the white rum (Bacardi®) has a RI close to 1.345 and the highest RI of the contaminant is 1.412
(ethylene glycol), the RI of the adulterated rum will increase as the volume of the contaminant is
increased. Therefore, considering that the MMI sensor exhibits a sensitivity of 258.06 nm/RIU for
liquids with RI ranging from 1.318 to 1.4203, we can accurately determine if a rum sample is free of
contaminants or adulterated with other liquid, which is typically performed using ethanol or toxic
elements like ethylene glycol. Although the sensor cannot determine which kind of liquid is altering
the rum, it can easily detect when the original rum has been adulterated, even with small amounts of
liquid. The sensor also provides high repeatability and reversibility while using a fast and simple
fabrication process.
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