Dynamic light scattering measuring device with the use of the phase modulation interference method

摘要

A device for measuring dynamic light scattering using a phase modulation - interference method comprises an optical coupler 5 for the distribution of light from a low coherence light source 2, a conversion of lens 10, to radiate a can be divided by the optical coupler 5 to a portion of the light sample medium 9, phase modulators 7, 8 to the module can of the phase of the other of the optical coupler 5 divided light portion, a spectrally measuring device 12 for measuring of the spectrum of the interference light of the phase modulated reference light and of the scattered light emanating from the sample medium 9, and an analysis instrument for measuring the dynamic light scattering of particles of the samples medium, based on at least any one of the spectrum of the first order in accordance with the fundamental frequency of the phase modulation signal or a spectrum of a higher order corresponding to a frequency equal to two, three or more times the fundamental frequency, which in the of the spectrally measuring device 12 measured interference light spectrum appear. The absolute value of s / l, the by norminieren of the light path length s within the medium to the mean free path length l of the particles is obtained, it is determined in order to not be greater than 3. dynamic properties of a medium a high concentration, with a high degree of precision, based on the scattered light, of the medium to be measured, a high concentration.