Patent ID: 8305087

Claim:
A particulate matter detection device comprising: a first electrode having a plate-like shape and having one surface covered with a dielectric material; a second electrode which is disposed on the side of the one surface of the first electrode via a space where a gas including a particulate matter flows and which performs one or both of discharge and the formation of an electric field by a voltage applied between the first electrode and the second electrode; a pair of measurement electrodes disposed on the surface of the dielectric material so as to face each other; and a protective film disposed on the surfaces of the pair of measurement electrodes and having a volume resistivity of 10 Ωcm to 10 12 Ωcm, wherein the protective film is formed of two layers of an insulating protective film disposed on the surfaces of the measurement electrodes and a low resistance film disposed on the surface of the insulating protective film and having; a volume resistivity of 10 −5 Ωcm to 10 Ωcm, wherein the variate of electric properties between the pair of measurement electrodes is measured to obtain the amount of the collected particulate matter.