Patent ID: 7605910
Filing Date: 2009-10-20
Classification: G01N

Abstract:
1. A particle measuring system, comprising: a sampling device for guiding a stream of an aerosol containing positively charged particles and negatively charged particles suspended in a gas, the sampling device adapted to take a part of the aerosol as a sample aerosol and also to allow the remaining part of the aerosol to diverge from the stream of the aerosol; an analysis device connected to the sampling device for guiding a stream of the sample aerosol, the analysis device designed to form an anode and a cathode along a flow direction of the sample aerosol to thereby separate the positively charged particles and the negatively charged particles on a size-by-size basis; a filter for filtering out the positively charged particles and the negatively charged particles contained in the remaining part of the aerosol to produce a filtered gas; a saturating device provided between the filter and the analysis device for guiding the filtered gas to the analysis device, the saturating device adapted to saturate the filtered gas with working liquid to thereby produce a saturated gas; a condensing device connected to the analysis device for condensing the saturated gas to produce liquid droplets each having a nucleus formed of one of the positively charged particles and the negatively charged particles; and an optical particle counter connected to the condensing device for detecting the liquid droplets supplied from the condensing device to thereby calculate the number and size of the positively charged particles and the negatively charged particles contained in the liquid droplets.