Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1980-06-09
1982-10-26
Arnold, Bruce Y.
Optics: measuring and testing
By particle light scattering
With photocell detection
250574, 356342, G01N 2101, G01N 2149, G01N 2185
Patent
active
043558976
ABSTRACT:
A light scattering photometer including a rotating segmented mirror intercepting light from a laser source and alternately directing the light into a sample zone along an optical axis in first and second opposite directions. A mask annulus coaxial with the optical axis intercepts light scattered from the sample in an incremental angle .DELTA..theta. at a selected angle .theta. with respect to the axis. As the direction of sample illumination alternates, the annulus alternately intercepts forward scatter and back scatter of light from the sample at angles .theta. and 180.degree.-.theta., respectively, and passes the forward and back scatter in alternate succession to a detector. The detector output signal is demodulated to derive near-simultaneous forward and back scatter measurements from the sample. The photometer permits measurement at small values of .theta. approaching 0.degree. and hence permits near-simultaneous scatter measurements at forward and back scatter angles spaced by an angle approaching 180.degree..
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Arnold Bruce Y.
Beckman Instruments Inc.
Meads Robert R.
Shewmaker John R.
Steinmeyer R. J.
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