Optical analysis
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United States of America Patent
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May 22, 1990
Grant Date -
N/A
app pub date -
Jul 5, 1988
filing date -
Sep 5, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for optical analysis of particles such as biological cells utilizes twin beams passing through a common optical fibre to avoid problems of alignment. For scattering measurements, a narrower beam can be used to gate detection of a broader beam to avoid amiguities associated with off-axis particles. The twin beams can also be used for thermal lensing, fluorescence or other techniques. Different beam diameters can alternatively be achieved in a single beam by controlling the focal length of a beam focussing lens.
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