A mmWave Phase Correlation Based Gas Velocity Sensor Utilizing Time Domain Multiplexed Fixed Target Radar Measurements

This study introduces an innovative gas-flow sensor concept grounded in time domain multiplexing of fixed target radar measurements. Leveraging an ultra-broadband mmWave FMCW radar system and a signal distribution network based on dielectric waveguides, the single measurement channel is subdivided into three distinct sub-channels in the time domain. Through the integration of marker gas injection and a radar phase cross-correlation algorithm, this method combines cost-effectiveness with highly precise flow measurements. In addition to presenting comprehensive design considerations, this paper substantiates the effectiveness and accuracy of the proposed measurement technique through detailed discussions of multiple test measurements.