Cryogenic systems, heavily used in rocket ground testing, space station operations, shuttle launch systems, etc, require a large number of temperature sensors for system management and control. Currently available temperature sensors cannot offer simultaneously sufficient reliability in highly corrosive environments of LOx and LH2 flows and sufficient temperature resolution. Development of new type of cryogenic temperature sensing solutions is needed to meet reliability and sensitivity requirements simultaneously and thus to provide NASA with more efficient, reliable solution for ground testing and flight missions. MicroXact Inc. proposes to develop highly sensitive, reliable sensing solution to address NASA needs that will offer ease of calibration and installation. In Phase I the feasibility of the solution will be experimentally demonstrated. In Phase II, sensors and system will continue to be refined and will undergo extensive testing and validation. By the end of Phase II, the proposed sensing solution will reach TRL 5. In Phase III, Luna will commercialize the developed sensors.