Estimating Particle Concentration in Natural Water by Far Field Speckle Intensity

A coherent light-scattering experiment on an aqueous clay suspension having a concentration that stretches over an extended range was carried on. The far field speckle was recorded in an unconventional manner.

A computer code for image processing, written for this purpose, was used to extract the scattered light intensity. The variation of the average scattered light intensity with the particle concentration was analyzed, and a possible fast procedure for assessing the particle concentration is suggested.