DETERMINING SENSIBLE HEAT FLUX WITHOUT CALIBRATION

摘要

By correcting temperature measurements above a surface (such as the ground) for the first-order filtering associated with the thermal inertia of a temperature sensor (such as a thermocouple) that performed the temperature measurements, the heat flux conveyed from the surface by air can be accurately determined without requiring a calibration procedure. Instead, a predefined calibration value may be used. This predefined calibration value may be a function of a size of the temperature sensor and/or a distance between the temperature sensor and the ground. Moreover, the predefined calibration value may have a fixed value for a given size of the temperature sensor. In addition, the measurement of the heat flux conveyed from the surface can be used to accurately determine the residual heat flux that vaporizes water from the surface without a calibration procedure.

主权项

1. An electronic device, comprising:
a temperature sensor configured to measure temperature during a time interval at a distance from a surface; and an analysis mechanism, coupled to the temperature sensor, configured to:
extract temporal ramp signals from the measured temperature during the time interval;modify the temporal ramp signals to compensate for first-order filtering associated with the temperature sensor;determine a heat flux conveyed from the surface to the temperature sensor via air based on the modified temporal ramp signals using a surface-renewal technique; andcorrect the heat flux based on a predefined calibration value that is related to a size of the temperature sensor.