Please use this identifier to cite or link to this item:

Full metadata record
DC FieldValueLanguage
dc.contributor.authorValente, A.-
dc.contributor.authorCunha, J. Boaventura-
dc.contributor.authorCorreia, J. H.-
dc.contributor.authorCouto, Carlos-
dc.identifier.citationWORLD CONGRESS OF COMPUTERS IN AGRICULTURE AND NATURAL RESOURCES, Iguaçu Falls, Brazil, 2001 – “World Congress of Computers in Agriculture and Natural Resources : proceedings”. [S.l. : s.n., 2001]. p. 440-447.eng
dc.description.abstractThis work presents an on-chip silicon bulk-micromachined Soil Moisture Sensor (SMS) suited for irrigation control and management applications. The same basic fabrication concepts and materials, which made microelectronics successful, are now being adapted to making low-cost, small, high-performance sensor systems with integrated electronics on the same chip. As a result, this system-on-a-chip includes the SMS, readout electronics, self-test, calibration facilities and a digital bus interface for external data transmission. Moreover, since this sensor has low-cost, it could be employed several sensors networked together with the 1-wire bus, to achieve an accurate measure of the soil moisture at the plant root level. A heat-pulse technique is used (for measuring the maximum temperature on a distant point) to determine the volumetric heat capacity and hence the water content of a porous media, such as soil. This method is based on the Joule effect (heater probe shank) and in Seebeck effect (thermopile – temperature probe shank). The heater and the thermopile are suspended on a dielectric window to reduce undesired heat conduction to the substrate (silicon is a good heat conductor). Thermal simulations of the bulk-micromachined SMS are performed to test sensor performance. In order to validate the method, simulations are made and experimental results were achieved with a macrosensor based on this technique. The results were compared with the measurements performed by the conventional thermo-gravimetric method.eng
dc.subjectInstrumentation and controleng
dc.subjectWater managementeng
dc.titleA silicon probe with integrated microelectronics for soil moisture measurementseng
Appears in Collections:DEI - Artigos em atas de congressos internacionais

Files in This Item:
File Description SizeFormat 
iguacu.pdfDocumento principal449,49 kBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID