Low speed calibration of hot-wire anemometers

A device for calibration of hot-wire anemometers at low velocities is described. The calibration technique is based on moving hot-wire probes in stagnant air. The device is relatively small, highly mobile and consists of a horizontal swing arm rotated by a DC motor. The motor speed can be adjusted to obtain the desired velocity range. Calibration procedures and data acquisition techniques used in this calibration are described. Results of calibration are discussed and the calibration constants are determined and compared with previous studies.