DropMonitor: Millimeter-level Sensing for RFID-based Infusion Drip Rate Monitoring
summary
A prototype system uses a pair of batteryless RFID tags attached to a drip chamber plus an Impinj reader and Laird antenna to sense millimeter-scale liquid-surface vibrations and infer drip rate from phase rotation in the IQ plane. Signals are resampled, a phase-difference interference cancellation between sensing and reference tags removes human-induced multipath, autocorrelation and peak clustering extract rates. Evaluation reports average relative error below 1% and simultaneous monitoring of over a dozen bags; hospital pilots run for weeks with stable results.
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