Abstract
There are two major varieties of the photon correlation technique: homodyne and heterodyne [1,2]. Heterodyne design of optical scheme is required in studies of the directed motion. This design is commonly used for Doppler velocimetry, in electrophoretic light scattering for instance. The homodyne method is generally less concentration sensitive, has 2 times worse signal to shot noise ration and gives data which are much more difficult to analyze, especially in the case of scattering on polydisperse solutions with very broad particle size distribution.
© 1996 Optical Society of America
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