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Type: Artigo de Periódico
Title: Autonomous Soil Moisture Sensor Based On Nanostructured Thermosensitive Resistors Powered By An Integrated Thermoelectric Generator
Author: Dias
PC; Cadavid
D; Ortega
S; Ruiz
A; Franca
MBM; Morais
FJO; Ferreira
EC; Cabot
Abstract: An autonomous single heat pulse probe porous ceramic soil moisture sensor powered by a thermoelectric generator (TEG) is presented. The sensor uses nanostructured thermosensitive resistors fabricated on the same ceramic substrate of the TEG. The nanostructured resistors, fabricated by printing PbS quantum dots, present a very high thermal coefficient (-16 x 10(3) ppm/degrees C) and, used in a bridge configuration with conventional precision and low thermal coefficient SMD metal film resistors, result in a high sensitivity temperature sensor. A laboratory prototype of the sensor showed a voltage variation of 2.4 mV in the output of the bridge when the volumetric water content of the soil changed from 5% to 40%. To complete the autonomous system, we designed an ultra low-power electronic interrogator which, when powered only by the 3 F supercapacitor of the integrated TEG energy harvesting system, was able to take daily measurements up to 5 days without harvesting energy. (C) 2016 Elsevier B.V. All rights reserved.
Subject: Semiconductor Nanoparticles Resistors
Thermosensitive Resistor
Soil Moisture Sensors
Energy Harvesting
Autonomous Sensors
Citation: Sensors And Actuators A: Physical. ELSEVIER SCIENCE SA, n. 239, p. 1 - 7.
Rights: fechado
Identifier DOI: 10.1016/j.sna.2016.01.022
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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