Optimization and Determination of the Frequency Response of Constant-Temperature Hot-Wire Anemometers

Recent findings that the common practice of optimizing the frequency response of constant-temperature hot-wire anemometers using a square wave test may result in the system being strongly underdamped have been confirmed. An iterative method based on the energy spectra of the responses to the square-...

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Bibliographic Details
Published in:AIAA journal 2017-08, Vol.55 (8), p.2537-2543
Main Authors: Fan, Dewei, Xiaoqi, Cheng, Wong, Chi Wai, Li, Jun-De
Format: Article
Language:English
Subjects:
Anemometers
Energy spectra
Frequency response
Hot-wire anemometers
Nonlinearity
Optimization
Overheating
Perturbation
Square waves
Wire
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Summary:Recent findings that the common practice of optimizing the frequency response of constant-temperature hot-wire anemometers using a square wave test may result in the system being strongly underdamped have been confirmed. An iterative method based on the energy spectra of the responses to the square-wave perturbations is proposed to achieve an optimal frequency response. The frequency responses at different operating conditions determined from the new and traditional methods are compared to show that the new optimization method can greatly improve the flatness of the frequency response of the constant-temperature hot-wire anemometer for all the operating conditions. It is also found that the constant-temperature hot-wire anemometer respond differently to the rising and falling edges of the square-wave perturbations due to nonlinearity, and this nonlinearity increases with the overheating ratio.
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J055801