A constant-temperature anemometer (CTA) enables the measurement of fast-changing velocity fluctuations. In the classical solution of CTA, the transmission band is a function of flow velocity. This is a minor drawback when the mean flow velocity does not significantly change, though it might lead to dynamic errors when flow velocity varies over a considerable range. A modification is outlined, whereby an adaptive controller is incorporated in the CTA system such that the anemometer’s transmission band remains constant in the function of flow velocity. For that purpose, a second feedback loop is provided, and the output signal from the anemometer will regulate the controller’s parameters such that the transmission bandwidth remains constant. The mathematical model of a CTA that has been developed and model testing data allow a through evaluation of the proposed solution. A modified anemometer can be used in measurements of high-frequency variable flows in a wide range of velocities. The proposed modification allows the minimization of dynamic measurement errors.
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July 2007
Research Article|
July 06 2007
Constant-bandwidth constant-temperature hot-wire anemometer
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Rev. Sci. Instrum. 78, 075104 (2007)
Article history
Received:
September 29 2006
Accepted:
June 03 2007
Citation
P. Ligęza; Constant-bandwidth constant-temperature hot-wire anemometer. Rev. Sci. Instrum. 1 July 2007; 78 (7): 075104. https://doi.org/10.1063/1.2752604
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