High-Sensitivity Microwave Sensor for Continuous Monitoring of Water-borne Suspended Solids

Résumé fourni par la source

This work introduces a highly sensitive microwave sensor system for real-time monitoring of suspended particle concentrations in water streams. The system employs a resonator-based tag positioned near the water sample and a coplanar waveguide (CPW) reader for wireless interrogation. When particles are suspended in water, they alter the dielectric properties, modifying the tag's resonant frequency through electromagnetic interactions. The CPW reader wirelessly captures these frequency shifts. The non-contact approach eliminates contamination risks while enabling continuous monitoring without interrupting water flow. Kaolin (KL) particles were examined as a representative suspended material in irrigation water. Experimental results demonstrate a total frequency shift of 1.7 MHz across 0 to 50 gIL concentration range, corresponding to 34 kHz per g/L sensitivity. This substantial shift is achieved despite only 1.74 % variation in real permittivity, highlighting the sensor's high sensitivity to subtle dielectric variations. Initial studies on deposition time rates were also conducted on three selected concentrations.

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