A direct method of particle sizing based on the statistical processing of scattered photons from particles executing Brownian motion
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- Dhadwal, H.S., Suh, K. & Ross, D.A. Appl. Phys. B (1996) 62: 575. doi:10.1007/BF01081696
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A direct method of determining the mean diameter of particles executing Brownian motion is presented. The temporal coherence of the scattered field from submicroscopic particles illuminated by laser light is a function of both the integration time and the particle diameter. The temporal degree of coherence of the time-averaged scattered intensity decreases as the integration time increases. Statistical processing of the scattered photons leads to a method of particle sizing (average diameter), which circumvents the need for digital autocor-relation or power spectral estimation.