Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-12-20
2000-07-11
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
340670, 116214, 250564, 250574, 356438, G08B 2100
Patent
active
060879475
ABSTRACT:
An allergen particle detecting apparatus has a sample area through which environmental air is directed. A light beam is directed through the air sample so that portions of the beam will be scattered if any particles are present in the path of the beam. A beam blocking device on the opposite side of the air sample is arranged to block all light except light scattered in a predetermined angular range corresponding to a predetermined allergen particle size range. Light transmitted through the blocking device is detected by a light detector and an alarm output signal is produced if the detected amount of light is above a predetermined level.
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Hamburger Robert N.
Jiang Jien-Ping
Wang Ruibo
Hamburger Robert N.
Wu Daniel J.
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