A digital mask technique for reducing the bias error of the correlation-based PIV interrogation algorithm |
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Authors: | L Gui W Merzkirch R Fei |
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Institution: | Lehrstuhl für Str?mungslehre, Universit?t Essen D-45117 Essen, Germany, DE
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Abstract: | In this paper the bias phenomenon in the evaluation of PIV recordings by using the correlation-based interrogation algorithm
is discussed, and a digital mask technique, that can effectively reduce the bias error, is introduced. The correlation-based
interrogation algorithm, when masked with a Gaussian window function, can achieve a higher evaluation accuracy not only for
PIV recordings of flows with small velocity gradients, but also for that of flows with large gradients.
Received: 14 October 1998/Accepted: 20 July 1999 |
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Keywords: | |
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