Autonomous soil moisture sensor based on nanostructured thermosensitive resistors powered by an integrated thermoelectric generator

Autor(es)

Dias, Pedro C. ^{[1, 2]} ; Cadavid, Doris ^[1] ; Ortega, Silvia ^[1] ; Ruiz, Alejandro ^[1] ; Franca, Maria Bernadete M. ^[3] ; Morais, Flavio J. O. ^[2] ; Ferreira, Elnatan C. ^[2] ; Cabot, Andreu ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Catalonia Inst Energy Res IREC, Jardins Dones de Negre 1, Barcelona 08930 - Spain

^[2] Univ Estadual Campinas, DSIF FEEC, Dept Semicond Instruments & Photon, Av Albert Einstein 400, BR-13083820 Campinas, SP - Brazil

^[3] Univ Estadual Londrina, UEL, BR-86057970 Londrina, PR - Brazil

^[4] Inst Catalana Recerca & Estudis Avancats ICREA, Jardins Dones de Negre 1, Barcelona 08930 - Spain

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS A-PHYSICAL; v. 239, p. 1-7, MAR 1 2016.
• Citações Web of Science: 11

Resumo

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. (AU)

• Processo FAPESP: 14/01470-3 - Projeto e fabricação de un sensor de umidade do solo usando dispositivos semicondutores fabricados com tinta semicondutora sobre alumina, integrado com um gerador termoelétrico de BITE
• Beneficiário: Pedro Carvalhaes Dias
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 12/20862-4 - Um sensor autônomo para medida de umidade do solo, de baixo consumo e baixa tensão, baseado na técnica de pulso de calor, usando geradores termoelétricos para colheita de energia
• Beneficiário: Pedro Carvalhaes Dias
• Linha de fomento: Bolsas no Brasil - Doutorado