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Title: Uncertainty Of NIST Airspeed Calibrations
Author: T. T. Yeh, J. m. Hall
Source: 2008 Measurement Science Conference
Year Published: 2008
Abstract: The National Institute of Standards and Technology (NIST) provides calibration services for airspeed instruments. Here, we describe NISTs recently upgraded airspeed calibration system and its uncertainty. At NIST, airspeed calibrations are performed over the range 0.15 m/s to 40 m/s in the wind tunnel that has a test cross section of 1.5 m by 2.1 m. The standard for airspeed measurement is a fiber optic laser Doppler anemometer (LDA), which is calibrated with known velocities produced by a rotating disk. The expanded airspeed uncertainty at 95 % confidence level (i.e. coverage factor k2) in m/s is the root-sum-square of 0.0064V and 0.0036 m/s, where V is airspeed in m/s. This gives a maximum uncertainty of 2.5 % (0.0038 m/s) at the lowest airspeed of 0.15 m/s and a minimum uncertainty of 0.65 % (0.26 m/s) at the highest speed of 40 m/s.

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