Portable air sampling systems including non-intrusive activity monitor and methods of using same
Lawless, P. (2000). Portable air sampling systems including non-intrusive activity monitor and methods of using same. (U.S. Patent No. 6105440). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=6105440
Abstract
Portable air sampling systems and methods are provided for intermittently sampling air in the breathing zone of a person over extended periods of time. Air sampling system performance can be continuously measured and recorded within a data logger. In addition, physical activity levels of a person wearing a portable air sampling system can be continuously monitored and recorded within the data logger. Air sampling system performance monitoring includes measuring pressure drop across a filter and measuring temperature of air flowing through the filter. Physical activity levels of a person can be monitored easily and non-intrusively by measuring changes in electrical capacitance of a transducer maintained in close proximity to the person.
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