The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 1980
Filed:
Mar. 05, 1979
Pierre-Andre Grandchamp, Munchenstein, CH;
Hoffmann-La Roche Inc., Nutley, NJ (US);
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.