Desenvolvimento de um sensor de baixo custo e descartável para o monitoramento de odor
Abstract
The research proposal was found low cost alternative solution to automatize the
classification and selection process to recognize fruit ripeness level using biologic
behavior instead of human visual inspection. The goal was to develop low cost and
disposable solid state sensor made of office paper with respective equipment for odor
monitoring. The concept used to development this sensor was replace the
interdigitated electrode with a conductive track using office paper impregnated with an
electrolyte that "turns" cellulose fiber in an electrical conductor under gas action. In
order to get gas adsorbing surface property for odor monitoring were tested some
electrolytes like: Magnesium Chloride, Potassium Iodide, Calcium Hydroxide and
others. This configuration replaced the interdigitated electrode per cellulose fiber
doped with an electrolyte, it´s the originality of this research. In the fruit ripening
process, the major enzymes involved are pectinase to crack the cell walls responsible
for the fruits softening, amylase which degrades carbohydrates to simple sugars
responsible for the flavor and hydrolase which reduces the amount of chlorophyll
responsible for the fruit color change. The reaction that produces ethylene gas (C2H4)
is lipids oxidation, the main gas exhaled during the fruits ripening process. The
equipment adopted to pick up electrical signal is based on resistance and capacitance
measuring that showed reversible electrical signal variation basically due the track
geometry and cellulose fiber doping with an electrolyte. Another feature found was the
office paper sensor decrease resistivity with fruit odors presence. The sensor
manufacturing process is simple, basically consist in printing a mask with a negative
image of the track by laser printing and office paper impregnation by an electrolyte.
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