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Dynamics of bridgeless constant temperature anemometers

Kiełbasa J.

International Journal of Applied Mechanics and Engineering

2001

Vol. 6, no 2

499-511

The paper presents a new technique for measuring the time constant of the bridgeless CTA in which the overheating ratio is set digitally. The results of studies of anemometer dynamic behaviour are discussed. The overheating ratio is modulated sinusoidally with respect to its mean value. The tests were run in steady- flow conditions. Hot wire sensors are made of tungsten wire 8 micrometers in diameter, 1.5-2 mm long. Tests were run in the air, at flow velocities of up to 1 m/s. frequency ranged from 10-500 Hz. The mean value of the overheating ratio was 1.8, while the amplitude of modulation was 10%.