| 摘要 |
<p>A real-time, integrated instrument, method and system based on Radio-frequency (RF) technology to measure over time the carbon core particulates and volatiles in an exhaust gas from a diesel engine's exhaust. The measurement method involves the two stages of (1) Carbon Particulate (CP) concentration by hot filtration and (2) RF-based measurement of accumulated CP which detects changes in the complex permitivity of a gaseous material with CP mixed therein via measuring the amount of attenuation for an RF signal passing through a low loss factor ceramic membrane-coated filter (Ceramem filter) between two antennaes. The system is capable of monitoring solid particles and liquid droplets that condense from exhaust emissions during cool air dilution, including soluble organic fraction (SOF), elemental carbon and sulfate particulates (SO4) or hydrated sulfuric acid, by using this diesel particulate filter (DPM) made with cordierite wall-flow monolith having square passageways lined with ceramic particulate layers functioning as a surface filter.</p> |
