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Abstract
Two solutions for UHF RFID tags for soil moisture sensing were designed and are described in this paper. In the first, two conventional tags (standard transponders) are employed: one, placed close to the soil surface, is the sensor tag, while the other, separated from the soil, is the reference for system calibration. By transmission power ramps, the tag’s turn-on power levels are measured and correlated with soil condition (dry or wet). In the second solution, the SL900A chip, which supports up to two external sensors and an internal temperature sensor, is used. An interdigital capacitive sensor was connected to the transponder chip and used for soil moisture measurement. In a novel design for an UHF RFID tag the sensor is placed below the soil surface, while the transponder and antenna are above the soil to improve communication. Both solutions are evaluated practically and results show the presence of water in soil can be remotely detected allowing for their application in landslide monitoring.
Highlights
In Brazil, due to serious social problems, human occupation occurs in hillsides usually evaluated as risk areas
This paper presents two solutions for the use of UHF passive RFID tags in soil moisture measurement, targeting landslide monitoring
A second tag, which is used as a reference by the reader, is separated from the soil with height A; it must be placed far from the soil, some centimeters high, in order to be insensitive to soil moisture
Summary
In Brazil, due to serious social problems, human occupation occurs in hillsides usually evaluated as risk areas. Moisture level or liquid identification have been frequent applications of UHF RFID tags in the literature [6,7,8,9,10,11,12,13,14,15], for example, monitoring the beverage volume in cup or bottle [11,12], water in concrete [5], moisture in wall [13] or in soil [9,10,14,15]. This paper presents two solutions for the use of UHF passive RFID tags in soil moisture measurement, targeting landslide monitoring
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