Naslov
Embedded Front-End for Xylem Sap Velocity Measurement with Single Pulse-Heated NTC Probe

Autori
Oletić, Dinko ; Šnajder, Boris ; Bilas, Vedran

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2020) Proceedings / - : Institute of Electrical and Electronics Engineers (IEEE), 2020

ISBN
978-1-7281-4460-3

Skup
2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2020)

Mjesto i datum
Dubrovnik, Hrvatska, 25.05.2020. - 29.05.2020

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
xylem sap flow ; single-probe ; NTC ; pulsed heating ; low-power ; sensor front-end ; precision irrigation

Sažetak
Abstract—In precision agriculture, plants’ water-stress management is crucial for preventing damages from drought, optimizing the irrigation costs, and increasing the yield quality. A common technique for quantifying the plants’ water-stress is measurement of xylem sap flow using nailed-in thermally excited flow sensors. We present an embedded sensor front- end for a minimally-invasive, low-power, intermittently pulse-heated sap velocity sensor. The design features a single negative temperature coefficient (NTC) thermistor probe, used simultaneously for heating and temperature measurement. Design parameters were assessed by finite-element thermal modelling and verified by laboratory experiments. The sensor front-end enables the measurement of sap velocity from a cool-down time after a single, short heating pulse (25 mJ). The proposed technique is especially suitable for measuring slow flows, enabling the resolution better than 1 μm/s at flow velocities lower than 0.4 mm/s. System’s maximal measurement frequency is 6 readings per minute. It enables hourly xylem sap velocity monitoring while consuming only 118 μW.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA