Page "Autocorrelation" Paragraph 14

* Autocorrelation is used to analyze Dynamic light scattering data, which notably enables to determine the particle size distributions of nanometer-sized particles or micelles suspended in a fluid.

A laser shining into the mixture produces a speckle pattern that results from the motion of the particles.

Autocorrelation of the signal can be analyzed in terms of the diffusion of the particles.

From this, knowing the viscosity of the fluid, the sizes of the particles can be calculated.