3 August 1999 Aircraft-based in-situ calibration of a hot-wire anemometer in a compressible flow
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High-bandwidth measurements of atmospheric velocity and temperature fluctuations in the high troposphere/low stratosphere using aircraft-based hot-wire anemometers requires calibration. An in-situ calibration characterizing wire sensitivity at high subsonic Mach numbers and relatively low temperatures and pressures was performed. Custom designed constant-temperature and constant-current anemometer equipment has been used for these atmospheric measurements. Two sets of calibration experiments are described, one in a controlled laboratory environment where the Mach number and temperature were varied and the other on board a C-135E aircraft. The aircraft test were conducted by varying the flight Mach number at different pressure altitudes while flying into an upper-level low pressure area, achieving variability in velocity, temperature, and pressure. Results obtained indicate increased sensitivity to velocity while operating the wire at a low overheat ratio. The calibration data was fit to a form of King's law which was found to work well for in-situ calibrations.
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Ronald J. Hugo, Ronald J. Hugo, Scott R. Nowlin, Scott R. Nowlin, Ila L. Hahn, Ila L. Hahn, Kenneth P. Bishop, Kenneth P. Bishop, Kimberley A. McCrae, Kimberley A. McCrae, } "Aircraft-based in-situ calibration of a hot-wire anemometer in a compressible flow", Proc. SPIE 3706, Airborne Laser Advanced Technology II, (3 August 1999); doi: 10.1117/12.356979; https://doi.org/10.1117/12.356979

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