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OPTICS AND LASERS
THE DOPPLER SHIFT
OPTICAL BEATING AND THE REFERENCE BEAM
6 other sections not shown
amplitude angle back scatter beam crossing beam splitter beat frequency beat signal broadening calculation cells channels circuits coherence coherence length components of velocity correlation function cycles detector aperture diameter differential Doppler arrangement differential Doppler technique diffraction distribution Doppler beat Doppler frequency Doppler shift Doppler signal effect electric field electro-optic equation flow fluid focused frequency shift fringe spacing fringe system Gaussian Gaussian beam heterodyne illuminating beam illustrated in Figure incident intensity interferometer laser beam laser Doppler technique lens light scattered limited mean square modulated noise ratio normally obtained optical beating optical path length oscillator output parallel particles photomultiplier photon correlation plane possible prism processor produced random phase reference beam reference beam technique reflection refractive index rotating scattered light scattering volume seeding shift frequency shown in Figure signal to noise spectrum analyser spherical surface tracker transit turbulence usually variation velocity velocity measurement voltage wave plate wavelength