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Type: Artigo de evento
Title: Proposal Of A Novel Heat Dissipation Soil Moisture Sensor
Author: Dias P.C.
Roque W.
Ferreira E.C.
Siqueira Dias J.A.
Abstract: A novel heat dissipation soil moisture sensor with only one bipolar transistor performing as both heating and temperature sensing element is presented. Due to the fact that the power dissipated in the transistor is a function of both the voltage and the current in the transistor, it is possible to obtain the required levels of heating power with low currents, increasing the battery life of the sensor's interrogator. Experimental results measured in a fabricated sensor show that in soils with high moisture levels the proposed sensor presents a sensitivity that is almost 10 times higher than those found in conventional sensors with separated heating and sensing elements. Since the transistor is used as both the heating and sensing elements, for the same applied energy (80 mW during 45 s) the temperature increase in the proposed sensor is about 7:5?C, while the conventional porous block probe presents a temperature increase of only 0:8°.
Rights: fechado
Identifier DOI: 
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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