Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Improved NIST Airspeed Calibration Facility

Published

Author(s)

Iosif I. Shinder, J. M. Hall, Michael R. Moldover

Abstract

The National Institute of Standards and Technology (NIST) uses a laser Doppler anemometer (LDA) as a working standard for airspeed calibrations in the range 0.15 m/s to 75 m/s (0.34 to 168 miles/hour). We report improved procedures for calibrating the LDA that reduced its uncertainty from 0.26% to 0.10% at airspeeds above 1 m/s. (Uncertainties are stated with the coverage factor k=2 which corresponds to a 95 % confidence level.) The calibration uses a rotating disk with known dimensions at several known rotation frequencies, thereby tracing the LDA to the primary standards of length and time. We also improved the LDA signal-to-noise ratio in NIST’s wind tunnel, particularly at higher air speeds, by replacing a water seeding system with an oil seeding system. New software automates the airspeed setting, oil-seeding rate, data-collection time, and instrument averaging time.
Proceedings Title
Measurement Science Conference Proceedings
Conference Dates
March 22-26, 2010
Conference Location
Pasadena, CA

Keywords

atomizers, airspeed calibrations, laser Doppler anemometer, primary standards

Citation

Shinder, I. , Hall, J. and Moldover, M. (2010), Improved NIST Airspeed Calibration Facility, Measurement Science Conference Proceedings, Pasadena, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904871 (Accessed March 1, 2024)
Created March 23, 2010, Updated February 19, 2017