Methods of and apparatus for the detection of airborne particles

Details Methods of and apparatus for the detection of airborne particles Methods of and apparatus for the detection of airborne particles

1980-11-13

1983-05-03

Swisher, S. Clement

Measuring and testing

With fluid pressure

Leakage

239215, G01M 320

Patent

active

043816649

ABSTRACT:
A method of measuring the containment efficiency of a biological safety cabinet comprises releasing an aerosol of identifiable droplets within the cabinet and then sampling ambient air in the proximity of the cabinet so as to determine if particles of said droplets have escaped from the cabinet. Apparatus for producing a suitable aerosol comprises an impeller rotatable about an upright axis, an electric motor for rotating the impeller at high speed, (e.g. 20,000 to 30,000 r.p.m.), a reservoir for potassium iodide aerosol solution disposed above the impeller, and a hypodermic needle for providing a controlled flow of aerosol solution from the reservoir to the impeller, whereby rotation of the impeller disperses particles of the aerosol solution.

REFERENCES:
patent: 1517144 (1924-11-01), Anderson
patent: 2182897 (1939-12-01), Loepsinger
patent: 3460125 (1969-08-01), Lieberman
patent: 3522724 (1970-08-01), Knab
patent: 3645127 (1972-02-01), Mongodin
patent: 4055075 (1977-10-01), Allan
patent: 4155249 (1979-05-01), Scott
patent: 4259080 (1981-03-01), Wunderlin

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