초록 ▼

An aerosol detection system for measuring particle number distribution with respect to particle dimension in an aerosol sample. The system includes an alternating dual-bag sampler, a radially classified differential mobility analyzer, and a condensation nucleus counter. Pressure variations in sampli

An aerosol detection system for measuring particle number distribution with respect to particle dimension in an aerosol sample. The system includes an alternating dual-bag sampler, a radially classified differential mobility analyzer, and a condensation nucleus counter. Pressure variations in sampling are compensated by feedback control of volumetric flow rates using a plurality of flow control elements.

대표청구항 ▼

[ What is claimed is:] [1.]1. A particle detection system, comprising:an input port to receive a gaseous flow having particles;a particle classifier having a particle chamber to receive an input sample flow derived from said gaseous flow, operable to classify said particles according to dimension of

[ What is claimed is:] [1.]1. A particle detection system, comprising:an input port to receive a gaseous flow having particles;a particle classifier having a particle chamber to receive an input sample flow derived from said gaseous flow, operable to classify said particles according to dimension of said particles and to export classified particles in a sampled output flow and unclassified particles in a unsampled output flow, wherein said particle chamber includes a first inlet to receive said input sample flow, a second inlet to receive a sheath flow derived from said gaseous flow, a sample exit to export said sampled output flow, and an unsampled exit to export said unsampled output flow; anda particle counting device having a flow inlet connected to receive said sampled output flow and a flow exit, operating to measure a number of particles in said sampled output flow;a flow control module to control flow rates of said input sample flow, said sheath flow, said sampled output flow, and said unsampled output flow in a relation with one another, said flow control module including:a first flow conduit connected to receive said gaseous flow and to partition a portion of said gaseous flow as said input sample flow;a second flow conduit, having a particle-eliminating filter therein, disposed to partition another portion of said gaseous flow as said clean sheath flow;whereby said system is operable to obtain a number distribution of said particles in the gaseous sample with respect to said dimension of said particles.