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Proceedings Paper

Aircraft-based in-situ calibration of a hot-wire anemometer in a compressible flow
Author(s): Ronald J. Hugo; Scott R. Nowlin; Ila L. Hahn; Kenneth P. Bishop; Kimberley A. McCrae
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Paper Abstract

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.

Paper Details

Date Published: 3 August 1999
PDF: 14 pages
Proc. SPIE 3706, Airborne Laser Advanced Technology II, (3 August 1999); doi: 10.1117/12.356979
Show Author Affiliations
Ronald J. Hugo, Air Force Research Lab. (United States)
Scott R. Nowlin, Air Force Research Lab. (United States)
Ila L. Hahn, Air Force Research Lab. (United States)
Kenneth P. Bishop, Applied Technology Associates, Inc. (United States)
Kimberley A. McCrae, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 3706:
Airborne Laser Advanced Technology II
Todd D. Steiner; Paul H. Merritt, Editor(s)

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