Energy ratio of the coherent and noncoherent components of the Doppler signal: analytical solution

Galina A. Kashcheeva; Victor S. Sobolev

doi:10.1117/12.682919

10 June 2006 Energy ratio of the coherent and noncoherent components of the Doppler signal: analytical solution

Galina A. Kashcheeva, Victor S. Sobolev

Proceedings Volume 6262, Optical Methods of Flow Investigation; 626203 (2006) https://doi.org/10.1117/12.682919
Event: Optical Methods of Flow Investigation, 2005, Moscow, Russian Federation

Abstract

The analytical expressions are obtained for the energy ratio of high-frequency Doppler signal coherent and noncoherent components as functions of the inhomogeneities concentration and the optical scheme parameters. The problem has been solved for the light intensity in the photodetector plane, for the flat scattering surface and differential optical scheme of the Laser Doppler Anemometer (LDA). It is shown that said energy ratio is directly proportional to the inhomogeneities concentration and inversely proportional to the numerical aperture of the photodetector. Boundary values of the concentration are specified at which the effects of the coherent and noncoherent components are equal. It is shown that effect of the coherent component essentially grows for small photodetector apertures and high inhomogeneities concentration.

Citation Download Citation

Galina A. Kashcheeva and Victor S. Sobolev "Energy ratio of the coherent and noncoherent components of the Doppler signal: analytical solution", Proc. SPIE 6262, Optical Methods of Flow Investigation, 626203 (10 June 2006); https://doi.org/10.1117/12.682919

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