A Self-powered And Autonomous Fringing Field Capacitive Sensor Integrated Into A Micro Sprinkler Spinner To Measure Soil Water Content

dc.creatorda Costa
dc.creatorEduardo Ferreira; de Oliveira
dc.creatorNestor E.; Morais
dc.creatorFlavio J. O.; Carvalhaes-Dias
dc.creatorPedro; Duarte
dc.creatorLuis Fernando C.; Cabot
dc.creatorAndreu; Siqueira Dias
dc.creatorJ. A.
dc.date2017
dc.datemar
dc.date2017-11-13T13:23:18Z
dc.date2017-11-13T13:23:18Z
dc.date.accessioned2018-03-29T05:55:56Z
dc.date.available2018-03-29T05:55:56Z
dc.identifierSensors. Mdpi Ag, v. 17, p. , 2017.
dc.identifier1424-8220
dc.identifierWOS:000398818700148
dc.identifier10.3390/s17030575
dc.identifierhttp://www.mdpi.com/1424-8220/17/3/575
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/328066
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1365091
dc.descriptionWe present here the design and fabrication of a self- powered and autonomous fringing field capacitive sensor to measure soil water content. The sensor is manufactured using a conventional printed circuit board and includes a porous ceramic. To read the sensor, we use a circuit that includes a 10 kHz triangle wave generator, an AC amplifier, a precision rectifier and a microcontroller. In terms of performance, the sensor's capacitance ( measured in a laboratory prototype) increases up to 5% when the volumetric water content of the porous ceramic changed from 3% to 36%, resulting in a sensitivity of S = 15.5 pF per unity change. Repeatability tests for capacitance measurement showed that the theta(v) sensor's root mean square error is 0.13%. The average current consumption of the system ( sensor and signal conditioning circuit) is less than 1.5 mu A, which demonstrates its suitability for being powered by energy harvesting systems. We developed a complete irrigation control system that integrates the sensor, an energy harvesting module composed of a microgenerator installed on the top of a micro sprinkler spinner, and a DC/ DC converter circuit that charges a 1 F supercapacitor. The energy harvesting module operates only when the micro sprinkler spinner is irrigating the soil, and the supercapacitor is fully charged to 5 V in about 3 h during the first irrigation. After the first irrigation, with the supercap fully charged, the system can operate powered only by the supercapacitor for approximately 23 days, without any energy being harvested.
dc.description17
dc.description3
dc.languageEnglish
dc.publisherMDPI AG
dc.publisherBasel
dc.relationSensors
dc.rightsaberto
dc.sourceWOS
dc.subjectAutonomous Sensors
dc.subjectSoil Water Content Sensors
dc.subjectCapacitive Soil Water Content Sensor
dc.subjectEnergy Harvesting
dc.subjectMicro Sprinkler Spinner Generator
dc.subjectUltra-low-power Circuits
dc.titleA Self-powered And Autonomous Fringing Field Capacitive Sensor Integrated Into A Micro Sprinkler Spinner To Measure Soil Water Content
dc.typeArtículos de revistas


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