Quasi bright field particle sensor

Details Quasi bright field particle sensor Quasi bright field particle sensor

1995-03-29

1997-02-25

Sykes, Angela D.

Optics: measuring and testing

By polarized light examination

356338, 606 11, G01N 1502

Patent

active

056064187

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.

REFERENCES:
patent: 3809478 (1974-05-01), Talbot
patent: 4653760 (1987-03-01), Dyer et al.
patent: 4799796 (1989-01-01), Musha
patent: 4930865 (1990-06-01), Dosman
patent: 5005977 (1991-04-01), Tomoff
patent: 5133602 (1992-07-01), Batchelder et al.

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