The Effect of a Finite Measurement Volume on Power Spectra from a Burst Type LDA

Preben Buchhave, Clara Marika Velte, William K. George

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Abstract

We analyze the effects of a finite size measurement volume on the power spectrum computed fromdata acquired with a burst-type laser Doppler anemometer. The finite measurement volume causes temporal distortions in acquisition of the data resulting in phenomena such as finite processing time and dead time.We compare analytical expressions for the bias and distortion of the velocity power spectrum computed from computer-generated data. We then compare the spectrum from the computer-generated data and a power spectrum from a measurement on a free turbulent jet in air and conclude that we have a valid understanding of the effects of the finite measurement volume on the measured velocity power spectrum.
Original languageEnglish
Title of host publicationProceedings of the 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Number of pages9
Publication date2014
Publication statusPublished - 2014
Event17th International Symposium on Applications of Laser Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 7 Jul 201410 Jul 2014

Conference

Conference17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
CountryPortugal
CityLisbon
Period07/07/201410/07/2014

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