Portable diesel particulate monitor
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United States of America Patent
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Aug 14, 2012
Grant Date -
Sep 9, 2010
app pub date -
Mar 9, 2010
filing date -
Mar 9, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A diesel particulate matter (DPM) monitor that can be worn, attached to a particular location or piece of equipment, and collects real-time data about DPM levels. In an exemplary embodiment, ambient air is drawn by a flow-controlled diaphragm pump through a particle size selector which only passes submicron particles. These particles are collected on an optically transparent filter. A laser illuminates the filter and the transmittance of the laser beam is measured in real-time by a photo detector. As DPM accumulates on the filter, the laser transmittance decreases. The instrument is calibrated to convert this decrease in transmittance to a real-time concentration of elemental carbon in the air.
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