Particle measurement apparatus flow cell useful for sample fluids having different refractive indexes
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United States of America Patent
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Oct 15, 2002
Grant Date -
N/A
app pub date -
Mar 17, 2000
filing date -
Mar 18, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flow cell for obtaining information on particles suspended in sample fluid, wherein an irradiation region M is defined in the flow cell for functioning as a particle detection portion to be irradiated with a laser beam La, and a wall portion of the flow cell is so adapted and arranged that the laser beam La becomes incident upon an outer wall surface of the flow cell 1 at a predetermined angle .theta..sub.1 (.theta..sub.1.noteq.0.degree.) and exits from an inner wall surface 5b of the flow cell 1 into the sample fluid 6 at a refraction angle 0.degree.. Further the wall portion 5 of the flow cell 1 is so arranged that the laser beam La becomes incident upon a boundary surface between the sample fluid and the opposite inner wall surface of the flow cell 1 at a predetermined incident angle .alpha. (.alpha..noteq.0.degree.) after being incident upon the sample fluid and passing through the irradiation region M.
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