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Frequency- and space-resolved measurement of local density fluctuations in air by laser vibrometry

B Hampel and J Woisetschläger

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The objective of this work was the application of interferometry as a tool for non-intrusive measurement of frequency spectra in turbulent flows. Two laser vibrometer systems together with a signal analyser were used to obtain the frequency spectra of density fluctuations across a fully developed turbulent free jet. Since laser vibrometry is based on interferometric techniques the derived signals are path integrals along the measurement beam. To derive local information on the frequency spectra of density fluctuations long-time averaged measurements from each of the two systems were treated using correlation functions and cross spectra. Results were compared to spectral data from a pitot-mounted pressure sensor.


PACS

47.80.-v Instrumentation and measurement methods in fluid dynamics

07.60.Ly Interferometers

47.27.er Spectral methods

42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy

47.27.wg Turbulent jets

47.27.De Coherent structures

Subjects

Fluid dynamics

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 10 (October 2006)

Received 8 May 2006, in final form 16 July 2006

Published 20 September 2006



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