Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1990-05-21
1991-10-01
Rosenberger, Richard A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356349, 356441, G01N 2149, G01B 902
Patent
active
050528068
ABSTRACT:
Apparatus is provided for measuring non-absorptive scattering with an exceptionally high degree of accuracy. In the preferred mode, the apparatus can also be used to measure absorptive scattering, thus providing a method of distinguishing absorptive scattering from scattering due to transparent moieties (i.e. non-absorptive scattering). The approach of the invention promises to significantly expand the use of optical systems in quality control. The general concept of the invention relies on symmetric heterodyne scattering. Specifically, two beams at slightly differing optical frequencies are directed to intersect at some arbitrary angle. Transparent objects within the intersection volume scatter light from each beam into the other. After intersecting, the two beams are directed to separate photodetectors which mix each transmitted beam with the scattered light from the other beam. Because the two beams are at different optical frequencies, the mixing of the light generates heterodyne (beat) signals modulated at the difference frequency on each of the photodetectors. These signals can then be combined in various ways to directly measure the absorptive and non-absorbtive scattering from the scattering region.
REFERENCES:
patent: 4397550 (1983-08-01), Matsuda et al.
Blue Sky Research, Inc.
Rosenberger Richard A.
Smith Joseph H.
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