Abstract
Ethanol measurements are performed in an ethanol/water solution utilizing an ethanol sensor based on a hetero-core structured optical fiber covered with a layer-by-layer thin film. The layer-by-layer (LbL) thin film was prepared using poly (allylamine hydrochloride) and poly styrene sulfonate. When the sensor was immersed in water, the propagating light intensity decreased with increasing ethanol concentration. This behavior suggested that the LbL film contracted due to the presence of ethanol, and the refractive index of the film increased, resulting in increasing propagating light leaks at the hetero-core of the fiber. The ethanol sensor was applied to a variety of spirits, and the propagating light intensity decreased with increasing ethanol concentration.
Highlights
Optical fibers have been used as telecommunication media because of their considerable advantages, such as their small size, lightweight construction, flexibility, immunity to electromagnetic interference, and low cost
In order to be used as chemical sensors, the propagating light must be able to interact with the outside environment
A hetero-core structured optical fiber covered with LbL film was applied to measure ethanol concentration
Summary
Optical fibers have been used as telecommunication media because of their considerable advantages, such as their small size, lightweight construction, flexibility, immunity to electromagnetic interference, and low cost. Many types of fiber optic ethanol sensors have been reported In these sensors, surface plasmon resonance (SPR) and/or localized surface plasmon resonance (LSPR) was used to measure the ethanol concentration based on the refractive index change [7,8,9]. The mechanical strength is enough because the cladding of the sensing part is not reduced In this primary study for the application of a hetero-core structured optical fiber to the food field, a simple fiber optic structure is reported based on Snell’s law, in which expansion or contraction of the layer-by-layer (LbL) thin film in the presence of ethanol results in a change of the refractive index a simple fiber optic structure is reported based on Snell’s law, in which expansion or contraction of the of the film. Layer-by-layer (LbL) thin film in the presence of ethanol results in a change of the refractive index of theMaterials film
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