This paper describes a system for soil moisture measurement based on a waveguide spectrometer that acquires “gain” and “phase” spectra, with a frequency range of 1.5 - 2.7 GHz. The fundamental components of the system are a waveguide, containing TX and RX antennas, and an electronic circuit, generating the electromagnetic waves and elaborating data, driven by a microcontroller (MCU). This system was previously tested on samples created in laboratory, but a study of system behavior in environmental conditions was missing. Therefore, acquisition of measurements and samples were conducted on real soil, and these data were used to obtain a good calibration model between spectra and soil moisture values. Calibration coefficients were used to implement the moisture calculation directly in the MCU, obtaining a non-invasive and stand-alone system. The architecture shows promising results and prove the capability of electromagnetic waves to perform accurate and fast silty clay loam moisture assessments on a real environment.
Soil moisture assessment with a waveguide spectrometer / Franceschelli, Leonardo; Brunelli, Davide; Crescentini, Marco; Ragni, Luigi; Berardinelli, Annachiara; Tartagni, Marco. - ELETTRONICO. - (2020). (Intervento presentato al convegno 52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020 tenutosi a Sevilla, Spain (virtual conference) nel 10th-21st October 2020) [10.1109/ISCAS45731.2020.9181300].
Soil moisture assessment with a waveguide spectrometer
Brunelli, Davide;Crescentini, Marco;Berardinelli, Annachiara;
2020-01-01
Abstract
This paper describes a system for soil moisture measurement based on a waveguide spectrometer that acquires “gain” and “phase” spectra, with a frequency range of 1.5 - 2.7 GHz. The fundamental components of the system are a waveguide, containing TX and RX antennas, and an electronic circuit, generating the electromagnetic waves and elaborating data, driven by a microcontroller (MCU). This system was previously tested on samples created in laboratory, but a study of system behavior in environmental conditions was missing. Therefore, acquisition of measurements and samples were conducted on real soil, and these data were used to obtain a good calibration model between spectra and soil moisture values. Calibration coefficients were used to implement the moisture calculation directly in the MCU, obtaining a non-invasive and stand-alone system. The architecture shows promising results and prove the capability of electromagnetic waves to perform accurate and fast silty clay loam moisture assessments on a real environment.File | Dimensione | Formato | |
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