Particle size and shape distribution analyzer

Details Particle size and shape distribution analyzer Particle size and shape distribution analyzer

2005-11-01

2005-11-01

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C356S335000

Reexamination Certificate

active

06960756

ABSTRACT:
A system and method for measuring the size, shape and distribution of particles wherein a digital image analysis based optical system characterizes the particle size distribution of granular and cohesion-less materials. The size and shape information is obtained in real time. Such an automated analysis system comprises the following four major components: 1) particle sizing hardware and software, 2) progressive scan CCD camera and stepper motor driven optical zoom system with large magnification ratio, 3) horizontal vibrating feeder, and 4) appropriate lighting system. In operation, the vibratory feeder allows the tested material free fall in front of the CCD camera. The backlight provided by a DC lighting system projects the free falling particles onto the camera's image plane. Pictures from free falling material are captured and transferred into the computer through a video frame grabber. The number of particles in each image is counted using specified intensity threshold and the size and shape of each particle is measured according to the calibration.

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patent: 5786894 (1998-07-01), Shields et al.
patent: 6721006 (2004-04-01), Hata
patent: 0195420 (1986-03-01), None
patent: 2000-314698 (2000-11-01), None
patent: 2001-165845 (2001-06-01), None

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