Airborne dust monitor

Details Airborne dust monitor Airborne dust monitor

1980-01-09

1981-10-27

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356439, G01J 100, G01N 2100

Patent

active

042975786

ABSTRACT:
An airborne dust monitor. Photosensitive elements detect a predetermined airborne dust level at a test region adjacent the photosensitive elements. The photosensitive elements are housed within a flue which shields the test region from ambient light while it conducts ambient air through the test region. In a preferred embodiment, the flue is formed of generally vertical sidewall members which define an ambient air passage through the test region, air passage outlets positioned above the test region and a baffle generally at the inlet of the air passage for allowing the entry of ambient air to the passage while blocking light from the test region. A test system may be provided by which a member is selectively positionable within the test region. Preferably, the photosensitive detecting elements include a radiant energy source and an element responsive to that radiant energy, most preferably infrared energy, the photosensitive elements being positioned to minimize dust settlement on the acting portions thereof.

REFERENCES:
patent: 2406409 (1946-08-01), Sheridan
patent: 3317730 (1967-05-01), Hilsum
patent: 3809913 (1974-05-01), Prellwitz
patent: 3854045 (1974-12-01), Breuer et al.

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