Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1985-03-28
1988-06-21
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
250564, 250573, 356442, G01N 2153
Patent
active
047521317
ABSTRACT:
In a laser-optical arrangement for producing signals by light scattering, obscuration or reflection, from flowing particles and/or groups of particles, which are recorded, as time-dependent voltage/current fluctuations, by means of a photodetector (9) via appropriate imaging optics (7,8,18), assignment to the degree of dispersion of the flowing system is based on a subsequent measurement (10) of the root-mean-square value, and, according to the invention, the sample stream (1) is separated from a transmitter (6,7,18) and a receiver (8,9,10) by an enveloping stream (4), and the transmitter side consists of an individual light-transmitting fiber (7) provided with a means for parallel or focused emergence of a light bundle having a diameter of the order of magnitude of the particles and/or groups of particles.
REFERENCES:
patent: 3899688 (1975-08-01), Perieres
patent: 4072421 (1978-02-01), Coyne et al.
patent: 4110044 (1978-08-01), Pettersson et al.
McFadyen et al., "An Automatic Flow Ultramicroscope for Submicron Particle Counting and Size Analysis", J. Of Colloid and Interface Science, vol. 45, No. 3, pp. 573-583, 12/73.
Colloid and Polymer Sci. 258 (1980) S.1303.
Colloid and Interface Sci. 17 (1962), S.605.
Ditter Walter
Eipel Heinz
Eisenlauer Josef
Horn Dieter
BASF - Aktiengesellschaft
Koren Matthew W.
Willis Davis L.
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