Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1988-05-23
1989-07-18
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
250574, 356246, G01N 2105, G01N 2149
Patent
active
048489050
ABSTRACT:
A method of and apparatus for measuring the density of fine particles floating in a fluid. The method includes the steps of: applying light to a fluid contained in a tubular member having an interior surface constituted by a mirror surface; condensing and detecting rays traveling toward one axial end of the tubular member among the light reflected by fine particles in the fluid; and subjecting the detected rays or signal to a predetermined processing, thereby measuring the density of the fine particles. The apparatus employed in this method includes: a tubular member; a light source directed in a direction perpendicular to the axial direction of the tubular member; a condenser lens disposed at one axial end of the tubular member; a detector opposing the condenser lens; and a processor which processes a signal applied thereto from the detector in a predeteremined manner to obtain the density of fine particles.
REFERENCES:
patent: 3462608 (1969-08-01), Weston et al.
patent: 3578867 (1971-05-01), Barrington
patent: 3953127 (1976-04-01), Ahlquist et al.
patent: 4023909 (1977-05-01), Ross
Idemitsu Kosan Company Limited
Koren Matthew W.
Willis Davis L.
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