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Preparation of PMMA fiber: 2 cm of cladding is removed with acetone and replaced with a mix of wood's glue (polyvynil acetate-PVA) and ethanol.
Tests with dry and wet soil
Adding pictures to the Report and more information about the results
Writing final report for Connected Fields project
Design of the transmitter & receiver circuits.
Meeting with Pov
Literature review on optical fiber sensors. Options with Fiber Gratt grating and tapered fiber implies special materials, equipment and procedure.
A simpler procedure was found in the paper "Polymer optical fiber moisture sensor based on evanescent-wave scattering to measure humidity in oil-paper insulation in electrical apparatus" (https://www.researchgate.net/publication/224360067). The idea is to remove the cladding with acetone and apply different layers of Polyvinyl-PVA (Wood glue).