A high sensitivity single-probe heat pulse soil moisture sensor based on a single npn junction transistor

dc.creatorDias, PC
dc.creatorRoque, W
dc.creatorFerreira, EC
dc.creatorDias, JAS
dc.date2013
dc.dateAUG
dc.date2014-08-01T12:54:30Z
dc.date2015-11-26T16:47:03Z
dc.date2014-08-01T12:54:30Z
dc.date2015-11-26T16:47:03Z
dc.date.accessioned2018-03-28T23:33:03Z
dc.date.available2018-03-28T23:33:03Z
dc.identifierComputers And Electronics In Agriculture. Elsevier Sci Ltd, v. 96, n. 139, n. 147, 2013.
dc.identifier0168-1699
dc.identifierWOS:000323795700013
dc.identifier10.1016/j.compag.2013.05.003
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/75896
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/75896
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1274724
dc.descriptionThe classic technique for measuring soil water content using heat dissipation properties was employed to develop a new single probe heat pulse sensor (SPHP). The novel sensor is comprised of only one element, a npn junction bipolar transistor, which works as both heating and temperature sensing elements. The variations of V-BE(T) as a function of the temperature are used to measure the temperature of the sensor and, since the behaviour of V-BE(T) is one of the most well studied expressions that describe the bipolar transistor, the sensor's temperature can be easily measured, with high accuracy. A technique which increases simultaneously the collector-base voltage V-CB and the collector current I-C of the transistor allows for the application of the heat pulse with low level currents, in the order of 6 mA. The sensor developed in this work presented a Delta T-max range of 9.1 degrees C between wet and dry soil conditions (theta(nu) between 5% and 35%), while the current available heat pulse probe sensors present a typical Delta T-max range of only 1.5 degrees C, showing the potential benefits of using a single bipolar junction transistor as a high sensitivity soil water content measurement sensor. (C) 2013 Elsevier B.V. All rights reserved.
dc.description96
dc.description139
dc.description147
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationComputers And Electronics In Agriculture
dc.relationComput. Electron. Agric.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectSoil moisture sensors
dc.subjectHeat dissipation sensors
dc.subjectSingle probe heat pulse sensors
dc.subjectPrecision agriculture
dc.titleA high sensitivity single-probe heat pulse soil moisture sensor based on a single npn junction transistor
dc.typeArtículos de revistas


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