Abstract
A highly integrated, Field Programmable Gate Array (FPGA) based induction measurement system for conductive flow level measurement is presented. Exploiting under-sampling and digital I/Q demodulation techniques, the system use direct digital sampling and can operate at multiple frequencies (from 100kHz to over 10MHz). Details are discussed in both hardware and software aspects. Simulations and experiments at 2.6MHz and 8.3MHz are carried out using saline solutions with conductivities of 1.8S/m and 4.3S/m to verify the performance of the system. Application of the system for saline level monitoring is implemented and studied, which further proves the applicability of the system in low conductivity object measurements.
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