System and method for determining and outputting airborne particle concentration
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United States of America Patent
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Jun 7, 1994
Issued Date -
N/A
app pub date -
Mar 10, 1993
filing date -
Jan 22, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for determining airborne particle concentrations. When in a fixed time period mode of operation, the system determines actual airborne particle concentration when a normal particle count is detected, and determines an 'upper limit' particle concentration based on Poisson statistics when a low particle count is detected. In a fixed precision mode of operation, the system determines in advance the number of particles needed to be detected to achieve an airborne particle concentration measurement having a precision equivalent to a user selected fixed precision, and prints out airborne concentration measurements only when such measurements have the user selected fixed precision.
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