Title
Design of A Readout System for a Low Leakage Soil Water-Content Sensor
Author
Meng, Xianglong (TU Delft Electrical Engineering, Mathematics and Computer Science)
Contributor
Makinwa, Kofi (mentor)
Fan, Qinwen (mentor)
Lopes Marta da Costa, Tiago (graduation committee)
Degree granting institution
Delft University of Technology
Programme
Electrical Engineering | Microelectronics
Date
2020-05-27
Abstract
Soil water-content sensors based on the measurement of soil impedance are widely used for the detection of rain-fall induced slope failure and other agriculture applications. In principle, low-leakage sensors can measure soil water content down to 4%, but they require readout systems capable of generating soil excitation signals at frequencies ranging from 1KHz to 1MHz. However, existing commercial products do not cover this frequency range. To solve this problem, a new readout system is proposed in this thesis. By using sinusoidal excitation, implemented by a pulse-width- modulated driver, and synchronous detection, the readout system achieves less than 1% measurement error from 1KHz to 1MHz.
To reference this document use:
http://resolver.tudelft.nl/uuid:30fe8f35-3e4d-4055-9247-592ed2a4a5f8
Embargo date
2023-05-29
Part of collection
Student theses
Document type
master thesis
Rights
© 2020 Xianglong Meng