Print Email Facebook Twitter Design of A Readout System for a Low Leakage Soil Water-Content Sensor 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, K.A.A. (mentor) Fan, Q. (mentor) Lopes Marta da Costa, T.M. (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 Files PDF Thesis_xianglong_final_fo ... _share.pdf 6.74 MB Close viewer /islandora/object/uuid:30fe8f35-3e4d-4055-9247-592ed2a4a5f8/datastream/OBJ/view