Dynamic characterization of temperature sensors by laser excitation
ABSTRACT In this article, a new dynamic calibration technique for sensors used to measure flow temperature is developed. The technique is based on laser heating of the sensor and allows one to operate in situ when optical access to the sensor is provided and the flow is transparent to laser light. It is possible to obtain both the time constant of the sensor and the convective heat exchange coefficient. Laboratory tests performed inside a wind tunnel, have shown the reliability and the advantage of such a technique. It is also possible to reduce the uncertainty on thermal exchange coefficient estimation (and therefore on the time constant) in order to obtain a more accurate model of the dynamic characteristics of the probes which are used for flow temperature measurements. © 1996 American Institute of Physics.