Interpretations in the control theory of thermal anemometers
Freymuth, P
1997 Meas. Sci. Technol. 8 174-7
Freymuth, P, (1997), "Interpretations in the control theory of thermal anemometers", Meas. Sci. Technol. 8 174-7.
Abstract:
The cut-off frequency, or frequency range, of a dynamically optimized constant temperature hot-wire anemometer is well known in terms of time constants of the wire and of the feedback amplifier, within the framework of a linear control theory of third order. A more convenient interpretation, in terms of a characteristic frequency of the wire and in terms of gain - bandwidths products of the amplifier, is presented both for an amplifier with a second-order response and for an amplifier with a first-order response. These convenient and intuitively appealing interpretations are also extended to hot-film anemometers.
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