Sensor for determining a concentration of particles in a gas flow

US10539492B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Andy Tiefenbach · Sachsenheim, DE
• Enno Baars · Leonberg, DE
• Sebastian Fuchs · Aalen, DE

Key dates

• Filing date: Aug 17, 2015
• Grant date: Jan 21, 2020
• Expiry date: Oct 14, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M15/102
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for determining a concentration of particles in a gas flow, e.g., soot particles in exhaust gas of an internal combustion engine, includes a carrier and a sensor, which is situated on a surface of the carrier and can be exposed to the gas flow, the sensor including an electrode structure including at least two measuring electrodes that are of different polarity and that are formed as an interdigital comb structure including finger electrodes. In first areas of the interdigital comb structure, the finger electrodes have a first mutual distance in relation to each other, and in second areas of the interdigital comb structure, the finger electrodes have a second smaller mutual distance in relation to each other, the first areas and the second areas in the interdigital comb structure each at least partially adjoining each other alternately, occupying respective surface areas on the sensor.