Method and apparatus for measuring particles in a fluid
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United States of America Patent
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Dec 15, 1992
Grant Date -
N/A
app pub date -
May 3, 1991
filing date -
May 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method and apparatus for measuring particles in a fluid by irradiating the fluid containing the particle with a laser beam and deriving particle characteristics such as diameter and size distribution from the intensity of the light scattered by the particles. Based on the value of the output of a photomultiplier used to detect the scattered light, it is determined whether a particle is a fine particle, which is a particle with a photoelectron pulse count that does not exceed a prescribed value, or a large particle, and these particles are counted separately. Fine particles are processed using photon counting, and large particles are processed by an analog process.
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