Quasi bright field particle sensor
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United States of America Patent
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Feb 25, 1997
Issued Date -
N/A
app pub date -
Mar 29, 1995
filing date -
Apr 1, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A structure and a method provide a quasi bright field particle sensor, using a laser beam of predetermined polarization. A phase shift caused by a particle passing through a laser beam is utilized to detect the presence of a particle. In one embodiment, the laser beam is split into two components of laser beams of orthogonal polarization separated by a predetermined distance, so as to allow detection of both spherical and non-spherical particles. In another embodiment, where only non-spherical particles are detected, a single laser beam is used.
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