Feasibility of Detecting Soil Moisture using Porous Al2O3 Cladded Al2O3 Waveguide
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The response of porous Al2O3 cladded Al2O3 thin film optical waveguide to moisture laden soil overlay is reported in this paper. The soil packed in a plastic container was used as in-touch overlay on the claded waveguide and changes in the transmitted output due to moisture content variations has been investigated. The 45% moisture laden soil decreases the output considerably. An interesting observation being that the decrease is more than that obtained when the clodded waveguide is directly exposed to moisture.
Moisture and type of soil dependent response is observed. In the lower moisture range the cladded waveguide is quite sensitive to soil condition.
KeywordsThin Film Al2O3 Soil Moisture Soil Condition Interesting Observation
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