Sensor assembly for determining total temperature, static temperature and Mach number
AssigneeRosemount Aerospace Inc.
InventorsJohn A. Severson, Kenneth J. Freeman, Dennis J. Cronin
Life of this patent
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Abstract
A temperature sensor is provided with at least two thermometers or temperature sensing elements that have different recovery factors, and which are in the same airflow. The recovery factors for the respective thermometers are determined for the sensor and stored in a memory of a processor. The temperature measured by each of the thermometers is provided to the processor, and the processor establishes ratios using the recovery factors and measured temperatures to determine total temperature and static temperature of the airflow in which the thermometers are placed.
Claims24
A temperature sensing assembly comprising a support having at least two thermometers mounted on the support, the thermometers being mounted to have different and known recovery factors when supported in common airflow, and circuitry providing signals indicating temperatures sensed at each of the thermometers, and the circuitry receiving signals representing the recovery factors of the thermometers, and being operable to calculate at least one of static temperature and total temperature of the airflow, based on the recovery factors and sensed temperatures of the two thermometers.
A method of determining total temperature and static temperature using sensed temperatures comprising providing two separated thermometers supported relative to a common airflow;
- determining the recovery factors of each of the thermometers as supported relative to the airflow;
- measuring the temperature sensed by each of the thermometers;
- establishing ratios utilizing the recovery factors of the respective thermometers, and the measured temperature at each of the thermometers to solve for total temperature and static temperature of the common airflow.
A temperature sensing assembly for determining air data parameters of air flowing past the assembly, comprising a housing having at least two thermometers mounted on the housing in positions to receive a common air flow, the thermometers having different and known recovery factors (Rf) when supported on the housing in the air flow, the thermometers each providing signals indicating temperatures sensed thereby, and a processor receiving the signals and providing ratios based on the sensed temperatures and recovery factors of the thermometers to provide outputs representing total temperature and static temperature.
Dependencies are inferred from the claim text.