Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-07-03
1999-12-28
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
340630, 250564, 250574, 356438, 116214, G08B 2100
Patent
active
060087293
ABSTRACT:
A light beam is directed from a light source through an 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. A light focusing lens in front of the light source is arranged to focus the unscattered part of the light beam onto the blocking device. 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. The signal may be used to activate filtering or air conditioning devices.
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"SIMSLIN II--A Portable Airborne Dust Measuring Instrument Employing a Light Scattering Technique", C. Casswell et al., Conference: Proccedings of the Fourth WVU Conference on Coal Mine Electrotechnology, Aug. 2-4, 1978.
Hamburger Robert N.
Jiang Jien-Ping
Wang Ruibo
Hamburger Robert N.
Wu Daniel J.
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