Measuring and testing – Particle size
Patent
1987-07-28
1990-01-23
Chapman, John
Measuring and testing
Particle size
G01N 1502
Patent
active
048950343
ABSTRACT:
Powder dispersing methods and apparatus for use in an aerodynamic particle sizing system utilizing a time-of-flight measurement technique. The powder disperser provides an airborne stream of particles from a powder sample. The apparatus includes a container for holding the sample and having an outlet, a device for agitating the powder sample to produce a cloud of particles, a device for separating clusters of particles in the cloud, and an air flow through the container for carrying the cloud of particles to the outlet. The separating device preferably includes a small annular orifice in which air flow applies high shear forces to clusters of particles, tending to separate them. The agitating device preferably includes a jet of air directed at the powder sample. In one embodiment, the agitating device and the separating device are located in separate chambers of the container. Techniques including avoiding sharp corners in the dispersing chamber and providing a sheath of clean air along the chamber walls limit powder deposition on the chamber walls.
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Amherst Process Instruments, Inc.
Chapman John
Raevis Robert R.
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