The National Institute of Standards and Technology (NIST) and the Oak Ridge National Laboratory (ORNL) are improving their airspeed calibration services. Both laboratories use spinning disks to generate linear velocities that are traceable to NISTs length and time standards. We compared their spinning disks using NISTs laser Doppler anemometer (LDA) as a transfer standard. At 10 m/s, the disks differed by (0.11 ± 0.26) %, where the uncertainty is two standard deviations. We discuss the techniques used to calibrate LDAs with spinning disks and their uncertainties.
Proceedings Title: 8th International Symposium on Fluid Flow Measurement
Conference Dates: June 18-22, 2012
Conference Location: Colorado Springs, CO
Pub Type: Conferences
laser doppler calibration, spinning disk calibration, primary standard