Particle measuring method and apparatus
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United States of America Patent
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Aug 4, 1992
Grant Date -
N/A
app pub date -
Sep 27, 1989
filing date -
Sep 30, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a particle measurement method and apparatus for measuring particle properties in which a laser beam is projected into a detection region in a medium containing particles to be measured, and a photoelectric detector having a predetermined dynamic range is used to detect the laser light scattered by the particles in the medium to produce signals which are evaluated to measure the particle properties. The polarization of the laser beam and the intensity of the scattered light are regulated in accordance with the range of particle sizes measured so that the intensity of the scattered light is within the dynamic range of the photoelectric detector. This arrangement makes it possible to expand the range of particle sizes with an improved resolving power in particle measurement without multi-valued ranges.
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