Method and apparatus for testing air filters and the like

Details Method and apparatus for testing air filters and the like Method and apparatus for testing air filters and the like

1979-06-29

1981-07-21

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356241, G01N 2188

Patent

active

042795087

ABSTRACT:
An apparatus for testing paper air filters and the like for leaks or holes comprises an arrangement for positioning an electric lamp on one side of the filter to provide a bright light and inspecting the filter for holes by observing it from the opposite side. A motor is provided for moving the light to selected positions along the filter. The inspection of the filter is effected by use of an electronic light image intensifier which makes possible the quick and reliable detection of very small holes in the paper.

REFERENCES:
patent: 3658421 (1972-04-01), Shelton
patent: 3688780 (1972-09-01), Everroad
patent: 3736790 (1973-06-01), Pontello

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