The BEV/E+E Elektronik Air Speed Reference

摘要

The paper presents a detailed description of the calibration equipment and procedure of the new Austrian reference laboratory for air speed in the range from 0.04 m/s to 40 m/s. Calibrations of pitot tubes, rotating wheel, vane, ultrasonic, and thermal anemometers are made as comparison measurements with a Laser Doppler Anemometer (LDA) in a homogenous reproducible wind tunnel flow. The new calibration procedure takes interactions between different types of probes and the air flow reference into account. The influence of the probe on the flow profile is determined and considered in the calibration setup as well as in the uncertainty budget. Finally, the uncertainty budget for the calibration process is described. Participation in international comparison projects has proved the traceability of the claimed CMC entries.