Measurement of the velocity difference by photon correlation spectroscopy: an improved scheme

Homodyne photon correlation spectroscopy is used to measure the velocity difference delta v (l) over varying distance l. Different length scales are probed when the magnification factor M and the width S of a slit in the collecting optics are varied. The measured intensity autocorrelation function i...

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Bibliographic Details
Published inApplied optics (2004) Vol. 36; no. 30; p. 7639
Main Authors Narayanan, T, Cheung, C, Tong, P, Goldburg, W I, Wu, X L
Format Journal Article
LanguageEnglish
Published United States 20.10.1997
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Summary:Homodyne photon correlation spectroscopy is used to measure the velocity difference delta v (l) over varying distance l. Different length scales are probed when the magnification factor M and the width S of a slit in the collecting optics are varied. The measured intensity autocorrelation function is found to be of scaling form for different values of M, provided S is kept at a value below the critical width S (c). A new convenient collecting optics is devised to expand the variable range of l up to 2 decades, over which delta v (l) can be accurately measured. The new scheme is useful for the study of turbulent and other self-similar flows.
ISSN:1559-128X
DOI:10.1364/AO.36.007639