Particle size meter

Details Particle size meter Particle size meter

1979-03-05

1980-11-11

Gruber, Felix D.

Boots, shoes, and leggings

356336, 364715, 364834, G01N 1502, G06G 748, G06F 1520

Patent

active

042336643

ABSTRACT:
Apparatus for determining the size of particles in Brownian motion by measurement based on analysis of fluctuations in the intensity of light diffused by the particles when they are illuminated by a ray of coherent light waves. The parameter(s) of interest is (are) determined in dependence on at least two double integrals R.sub.1, R.sub.2 having the general form ##EQU1## where the values .tau.a, .tau.b, .tau.c, .tau.d define the integration ranges in the delay-time .tau. region and where .DELTA.t represents an integration range with respect to time from an initial instant .tau..sub.o. Means are provided for forming signals representing the double integrals R.sub.1 and R.sub.2. A computer unit receives the signals and generates an output signal corresponding to the aforementioned parameter(s) of the autocorrelation function.

REFERENCES:
patent: 3797937 (1974-03-01), Shofner
patent: 3842252 (1974-10-01), Jakeman et al.
patent: 4140395 (1979-02-01), Kreikebaum

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