Sampler of gas borne particles

Details Sampler of gas borne particles Sampler of gas borne particles

1975-03-28

1976-02-17

Swisher, S. Clement

Measuring and testing

Gas analysis

Solid content of gas

55261, 734215R, G01N 1500

Patent

active

039383679

ABSTRACT:
An atmosphere sampler includes a very thin filter element with straight-through holes on the order of 1.mu.. A sample of air with particles to be examined is driven by means of a pressurized low molecular weight gas, e.g., He to the filter element front side. A partial vacuum may be present at the back side of the filter element. The pressure differential across the filter element is just below the rupture point of the filter element. By admixing a low molecular weight gas as the carrier gas with the air sampler the velocity with which the air sample is driven to the filter element is maximized for the particular pressure differential across the filter element, so that at least some particles with diameters less than the hole diameter do not follow changes in the air stream line direction as it passes through the filter element holes and therefore the smaller diameter particles are deposited on the filter element. When using a filter element of plastic material of a thickness on the order of 10.mu., a stainless steel back-up plate and a diffusion member are used to support the filter element when subjected to a pressure differential on the order of a few hundred atmospheres.

REFERENCES:
patent: 3478600 (1969-11-01), Lynn
patent: 3819330 (1974-06-01), Creighton

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