G - Physics – 01 – N
Patent
G - Physics
01
N
73/59
G01N 21/84 (2006.01) G01N 21/53 (2006.01)
Patent
CA 2035703
ABSTRACT A system and method for determining and printing airborne particle concentration including, inter alia, a real time particle monitor having, a particle counting means, a display means, a keyboard means, a printout and/or other output means, and a processing means to control the interaction of the various electronic components and to perform necessary calculations. The system allows a user to select a fixed time period or a fixed precision mode of operation for the particle monitor. When the system is in the fixed time period mode and a normal particle count is detected, the system advances to a routine to determine the actual airborne particle concentration and the associated precision of that determination in a normal manner. When a low particle count is detected, the system advances to a low particle count routine to determine an "upper limit" particle concentration based on Poisson statistics. At the expiration of the user selected fixed time period, the system prints out either the appropriate upper limit particle concentration or the actual particle concentration and associated precision. Alternatively, when the system is in the fixed precision mode, the system prints out airborne particle concentration measurements only when such measurements have a user selected fixed precision. In this mode, 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 the user selected fixed precision. The system then waits until the actual - 1 - particle count is equivalent to the required particle count before printing the airborne particle concentration. The printed values for airborne particle concentration and precision for either the fixed time period or fixed precision modes represent the current airborne concentration since the last printout. The system also displays on a LCD screen the total particle count since commencement of monitoring as well as the time weighted average airborne particle concentration and precision, or upper limit airborne particle concentration, since commencement of monitoring. The combination of LCD and printout data presentation provides an all encompassing and versatile presentation of information on airborne particle concentration. - 2 -
Lilienfeld Pedro
Sim & Mcburney
Trc Companies Inc.
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