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This report summarizes the first year research and development effort leading to development of high--temperature sensors for enhanced geothermal systems. It covers evaluation of ultrasonic and electromagnetic (EM) techniques applied to temperature measurement and flow characterization. On temperature measurement, we have evaluated both microwave radiometry and ultrasonic techniques for temperature gradient and profile measurements. Different antenna designs are evaluated and array loop antennadoi:10.2172/993701 fatcat:a33ldbjs5vgf7a7ppo3dx44724