engleski

Piezoelectric sensor front-end for energy- efficient acquisition of ultrasonic emissions related to water-stress in plants

Formation of embolisms in plant’s xylem water transport vessels is considered a major cause of plant mortality due to water-stress. Passive ultrasonic acoustic emissions (AE) monitoring shows the most potential for field- quantification of embolism level. However, this requires designing energy-efficient embedded hardware for autonomous high-speed ultrasonic AE acquisition, processing, and storage. In this paper we present a piezoelectric sensor interface for triggered AE acquisition at 2 MS/s. Its design requirements were assessed by laboratory dehydration experiments on grapevine pot-plants. An embedded prototype was design and characterized. The proposed architecture enables event-based acquisition of AE within 120-550 kHz band, at 5.7 mW average power, and 717 ns wakeup-latency.

piezoelectric sensors ; signal conditioning ; low power design ; ultrasonic acoustic emissions ; water stress ; xylem embolism ; precision agriculture

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