Apparatus for detecting fibrous particle sizes by detecting scat

Details Apparatus for detecting fibrous particle sizes by detecting scat Apparatus for detecting fibrous particle sizes by detecting scat

1986-09-25

1988-04-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356343, G01N 2186

Patent

active

047376481

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.

REFERENCES:
patent: 4146799 (1979-03-01), Pitt et al.
patent: 4284355 (1981-08-01), Hansen et al.
patent: 4540283 (1985-09-01), Bachalo
patent: 4672216 (1987-06-01), Pitt et al.

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