Particle counter with improved image sensor array

Details Particle counter with improved image sensor array Particle counter with improved image sensor array

2005-11-15

2008-11-25

Chowdhury, Tarifur R (Department: 2886)

Optics: measuring and testing

For size of particles

By particle light scattering

C356S338000

Reexamination Certificate

active

07456960

ABSTRACT:
A particle counter for optically detecting an unconstrained particle of less than one micron in size suspended in a flowing liquid includes a sample chamber having a fluid inlet and a fluid outlet; a laser module producing a laser beam; a beam shaping optical system providing a multiple laser beam pattern in the sample chamber, and a CMOS optical detector located to detect light scattered by the particles in the sample chamber. The particle counter has a particle sensing area within the sample chamber in which the intensity of light is at least 10 Watts/mm2, the sensing area having an area of 0.5 square mm or more. The detector has thirty or more detector array elements. In the preferred embodiment, the laser optical system reflects and refocuses the laser beam to effect multiple passes of the same laser beam through the sensing area.

REFERENCES:
patent: 4739177 (1988-04-01), Borden
patent: 4798465 (1989-01-01), Knollenberg
patent: 5282151 (1994-01-01), Knollenberg
patent: 5565984 (1996-10-01), Girvin
patent: 2003/0020910 (2003-01-01), Peterson et al.
patent: 2005/0136548 (2005-06-01), McDevitt et al.
patent: WO 2004/031742 (2004-04-01), None
Knollenberg, R.G.; “The Design Of A High Sensitivity Large Sample Volume Particle Counter For Ultra Clean DI Water”;Microcontamination 92 Conference Proceedings; Santa Clara, CA; pp. 764-776; Canon Communications; 1992.
Knowlton, D.K.; “Iniviscid Jet Technology For Monitoring Particles In Fluids”;Proceedings 1998 Institute of Environmental Sciences And Technology; pp. 34-39; 1998.
Cerni, T.A.; “High Sensitivity, High Sample Rate, Aerosol Optical Particle Counter”;Clean Technology; vol. 11, No. 6; pp. 12-14; 2001.
http://www.micron.com/products/imaging/products/MT9M413.html; Micron Document No. MT9M43C365TC.fm—ver. 3.0; Jan. 2004 EN.

Affiliated with

Also associated with

Rating

Particle counter with improved image sensor array does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Particle counter with improved image sensor array, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Particle counter with improved image sensor array will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4023743