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Effect of altitude and wind velocity on optical-turbulence measurement with fine-wire resistance temperature transducers

The response of fine wire resistance temperature transducer was analyzed including the effects of (i) conductive heat transfer between wire and the supporting prong and (ii) a thermal boundary layer which can form around the prongs especially at low stream velocities. The transfer function H(w) varied substantially with frequency of turbulence and density and velocity of the air stream. The a.c. gain of the sensor was evaluated as a function of altitude (0-30 km) and air stream velocity. Variation in a.c. gain with altitude can lead to a significant error in the measurement of turbulence with (delta)T probes. The error becomes even larger if the velocity of air stream (relative to sensor) becomes very small.