Effect of validation procedure on step noise amplitude in LDV spectra evaluation |
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| Authors: | A Coghe G E Cossali |
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| Institution: | (1) Dipartimento di Energetica Politecnico di Milano Piazza Leonardo da Vinci 32, I-20133 Milano, Italy, IT;(2) Università di Bergamo Via Marconi 5, I-24044 Dalmine, BG, Italy, IT |
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| Abstract: | The evaluation of turbulence power spectra from velocity data acquired by LDA is considered. An analysis of the effect of
the validation procedure, implemented in many data processors, on the power spectrum obtained by the sample and hold method
is reported and compared to experimental results. The existence of a new term in the measured power spectrum step noise is
predicted and experimentally verified and a procedure for eliminating spectral bias and estimating the Taylor time scale is
suggested and applied.
Received: 13 May 1997/Accepted: 21 October 1997 |
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