Apparatus for detecting fibrous particle sizes by detecting scattered light at different angles
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United States of America Patent
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Apr 12, 1988
Grant Date -
N/A
app pub date -
Sep 25, 1986
filing date -
Sep 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention comprises apparatus capable of unambiguous determination of the length and diameter of fibrous particles, especially asbestos fibres, based on near-forward scattering of light by fibres aligned in a hydrodynamically focused gas flow. Three portions of scattered light are detected, two portions perpendicular to the fibre axis and one aligned with it, from which length and diameter can be independently determined. This independence is achieved by allowing only selected parts of the light scattered within certain selected ranges of angles to reach each detector. A two-detector instrument capable of accurate determination of fibre diameter is also described.
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