Low noise intracavity laser particle counter

Details Low noise intracavity laser particle counter Low noise intracavity laser particle counter

2005-06-07

2005-06-07

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S339000, C356S436000, C250S341800

Reexamination Certificate

active

06903818

ABSTRACT:
An optical particle counter has a gain-apertured laser cavity producing laser light, an inlet jet providing fluid flow into a particle detecting region within the laser cavity, the inlet jet having an inlet jet orifice; a detection optics assembly located to collect light scattered from particles with the detecting region for producing an output signal indicative of the particles; and an optical barrier complex located to reduce noise as compared to the gain-apertured system without the optical barrier complex for fluid flow rates greater than or equal to about 0.1 cubic feet per minute. The optical barrier complex inhibits laser light from illuminating turbulent eddy currents originating on the interior walls of the inlet jet. The optical barrier complex includes one or more physical apertures, one or more optical stops, or both which are located to prevent laser light from illuminating the eddy currents.

REFERENCES:
patent: 3700333 (1972-10-01), Charlson et al.
patent: 3983743 (1976-10-01), Olin et al.
patent: 4992190 (1991-02-01), Shtarkman
patent: 5872361 (1999-02-01), Paoli et al.
patent: 5889589 (1999-03-01), Sandberg
patent: 5946093 (1999-08-01), DeFreez et al.
patent: 6091494 (2000-07-01), Kreikebaum
patent: 6137572 (2000-10-01), DeFreez et al.
patent: 6275288 (2001-08-01), Atkinson et al.
patent: 6404494 (2002-06-01), Masonis et al.
patent: 6414754 (2002-07-01), Johnson
patent: 6710878 (2004-03-01), Dean et al.

Affiliated with

Also associated with

Rating

Low noise intracavity laser particle counter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low noise intracavity laser particle counter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low noise intracavity laser particle counter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3474052