Abstract
We theoretically investigate a path-length-resolved power spectrum measured by a dynamic light scattering (DLS) method with a low-coherence light source. The heterodyne DLS power spectrum is analyzed on the basis of the coherence of the light source. It is shown that the power spectrum consists of a time-averaged intensity, a homodyne component, and a heterodyne component. The path-length distribution function can be therefore estimated from the heterodyne component because it becomes equivalent to the path-length-resolved power spectrum. The low-coherence DLS measurement depends on whether or not only the heterodyne component can be extracted from the measured power spectrum with high signal-to-noise ratio. In this paper, the frequency shift and phase modulation methods are shown to be effective from the viewpoint of signal-to-noise ratio.
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