PARTICULATE MATTER DETECTOR

• Main Authors: KIMATA TAKEHITO, NAKAMURA SATOSHI, HARADA TOSHIHIKO, MIZUTANI KEIGO
• Format: Patent
• Language: English
• Published: 06.09.2012
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; PHYSICS; STEAM ENGINES; TESTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a particulate matter detector for detecting particulate matter in a gas to be measured, that ensures high reliability by reducing a measurement error caused by coarse particles while removing influence caused by the difference in a placing direction of a detection element and dealing with the change in flow velocity of the gas to be measured.SOLUTION: A particulate matter detector has a measured gas introduction hole 301 in a base end side face 300 of a cover body 3 formed into a nearly bottomed cylinder covering at least a detection element 1, and a measured gas extraction hole 311 in a bottom 310, so as to form a flow that moves a measured gas in the direction of the longitudinal axis of the detection element 1. In addition, a measured gas passage way 141 is defined in the detection element 1; one end 151 of the passage way opens, on the base end side of the detection element, in a direction perpendicular to the direction in which the measured gas advances; the other end 142 at the tip end of the detection element 1 opens in a direction facing the measured gas extraction hole 311; and a pair of detection electrodes 12 and 13 for detecting an electrical characteristic varying with the amount of particulate matter accumulating in the measured gas passage way 141 is formed.