Dynamics of statistically inhomogeneous speckles: an application to blood and lymph flow measurements

Sergey S. Ul'yanov

doi:10.1117/12.226723

10 November 1995 Dynamics of statistically inhomogeneous speckles: an application to blood and lymph flow measurements

Sergey S. Ul'yanov

Proceedings Volume 2647, International Conference on Holography and Correlation Optics; (1995) https://doi.org/10.1117/12.226723
Event: International Conference on Holography and Correlation Optics, 1995, Chernivsti, Ukraine

Abstract

In the paper on the basis of theoretical and experimental analyses it is shown that the spectrum of intensity fluctuations contains the high frequency peak in the absence of subsidiary reference wave at non-small angles of speckles observation. Such phenomenon, interpreted as a new type of manifestation of Doppler effect, is habitual only for the case of strongly focused coherent beam scattering. In the paper the possibilities of the usage of the observed effect in the measurements of blood and lymph flows in narrow native capillaries are discussed. Traditional Doppler method utilizing the strongly focused Gaussian beam scattering is considered. It is shown that the frequency position of Doppler peak in the spectrum of intensity fluctuations of measurements is defined not only by the angle of speckles observation but also by the relation between the waist beam diameter and the average size of flow inhomogeneities. Such result was experimentally verified. In the paper it is concluded that the Doppler method of blood flow measurements utilizing strongly focused Gaussian beam diffraction has to be revised.

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Sergey S. Ul'yanov "Dynamics of statistically inhomogeneous speckles: an application to blood and lymph flow measurements", Proc. SPIE 2647, International Conference on Holography and Correlation Optics, (10 November 1995); https://doi.org/10.1117/12.226723

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KEYWORDS

Doppler effect

Scattering

Blood

Laser scattering

Lymphatic system

Gaussian beams

Diffraction

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