engleski

Verifying sensitivity of a sensor system for logging xylem’s acoustic emissions related to drought stress

Novel field-instruments are required for noninvasive, automated early detection of plant water-stress. In preparations for field trials, we evaluated sensitivity of a novel embedded sensor system designed for in-field logging of ultrasonic acoustic emissions (AE) related to formation of xylem embolism. The designed sensor system entails an analog frontend for high-impedance piezoelectric sensors, an event driven 2.5 MS/s A/D conversion with wake-up capability, onboard real-time frequency-domain AE processing, and micro-SD card storage. The system's water-stress detection sensitivity was tested in laboratory dehydration experiments on grapevine (Vitis vinifera, L.) pot-plants. It was confirmed that its sensitivity is comparable to a reference laboratory AE measurement chain. The designed sensor system enables detection of grapevine water-stress corresponding to moderate leaf water potential below -0.9 MPa.

water-stress, xylem embolism, ultrasonic acoustic, emissions (AE), piezoelectric sensors, embedded systems, near-sensor processing, precision agriculture

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