Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/4883
Título: | A silicon probe with integrated microelectronics for soil moisture measurements |
Autor(es): | Valente, A. Cunha, J. Boaventura Correia, J. H. Couto, Carlos |
Palavras-chave: | Instrumentation and control Water management Microsensors |
Data: | 19-Set-2001 |
Citação: | WORLD 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. |
Resumo(s): | This 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. |
Tipo: | Artigo em ata de conferência |
URI: | https://hdl.handle.net/1822/4883 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | DEI - Artigos em atas de congressos internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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iguacu.pdf | Documento principal | 449,49 kB | Adobe PDF | Ver/Abrir |