Abstract
Several different specially designed flowmeters, both in the sonic frequency region, f = 3.1 kHz, and the ultrasonic frequency region, f = 40 kHz, for measuring air velocities were investigated. Special emphasis was given to measurements of very low air velocities, than 1 ms -1. The flowmeters and an anemometer were first run with reference to a pitot-static tube. The accuracy of the output values of the pitot-static tube, however, was ratherpoor at low air speed. The output values from the ultrasonic flowmeter, the pitot-static tube and the anemometer were then compared with those from a laser-Doppler system. The output values from the pitot-static tube were too high by comparison with those measured by the laser-Doppler system for air velocities less than ca. 0.3 ms -1. The anemometer did not give any values for air velocities lower than ca. 0.06 ms -1. The flowmeter, however, gave quite linear velocity curves down to the lowest measured air velocities.
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