Method and apparatus for measuring air permeability of a wall-li

Details Method and apparatus for measuring air permeability of a wall-li Method and apparatus for measuring air permeability of a wall-li

1987-04-18

1988-07-12

Levy, Stewart J.

Measuring and testing

With fluid pressure

Porosity or permeability

73 377, G01N 1508

Patent

active

047561831

ABSTRACT:
Method and Apparatus for Measuring Permeability to Air of a Wall-Like or Sheet-Like Element, comprising the use of a measurement head including a blower having an air-discharge nozzle, a blade wheel and a variable-speed motor for rotating the wheel to produce an air flow which discharges through the nozzle. Pressure in the blower and speed of blade wheel rotation are detected, with appropriate signals indicative thereof being input to a central unit which then appropriately adjusts speed of rotation of the blade wheel to correspond to a predetermined blower pressure value. Permeability value of the element is then determined at the central unit, based on relationship between the speed measurement signal values, and corresponding permeability values.

REFERENCES:
patent: 3808876 (1974-05-01), Kershaw
patent: 4311037 (1982-01-01), Gotchel et al.
patent: 4401147 (1983-08-01), Beck et al.
patent: 4536971 (1985-08-01), Pulsmeier et al.
patent: 4676091 (1987-06-01), Schuster et al.

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