Hot-wire/film anemometers have been broadly used in experimental studies in fluid mechanics, acoustics, and ocean engineering. Yet, it is well known that hot-wire/film anemometers rectify the signal outputs due to the lack of sensitivity to flow direction. This main drawback, in turn, makes them less useful for diverse fluctuating flow measurements. To solve this issue, a rectification recovery method has been developed based on reconstruction of the Fourier series expansion in conjunction with signal-squaring approach. This signal recovery method was experimentally examined and proven to be successful for both conventional and microfabricated hot-wire/film anemometers. The method was further applied to dipole field measurements, with data from recovered signals perfectly matching the analytical model of the dipole field.
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January 2010
Research Article|
January 15 2010
Recovery of rectified signals from hot-wire/film anemometers due to flow reversal in oscillating flows
Yingchen Yang;
Yingchen Yang
a)
1Department of Mechanical Engineering,
Northwestern University
, Evanston, Illinois 60208, USA
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Douglas L. Jones;
Douglas L. Jones
2Department of Electrical and Computer Engineering,
University of Illinois at Urbana-Champaign
, Urbana, Illinois 61801, USA
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a)
Current address: Department of Engineering, University of Texas at Brownsville, Brownsville, TX 78520, USA.
b)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Rev. Sci. Instrum. 81, 015104 (2010)
Article history
Received:
June 11 2009
Accepted:
December 03 2009
Citation
Yingchen Yang, Douglas L. Jones, Chang Liu; Recovery of rectified signals from hot-wire/film anemometers due to flow reversal in oscillating flows. Rev. Sci. Instrum. 1 January 2010; 81 (1): 015104. https://doi.org/10.1063/1.3277109
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