Gas sensor and method for detecting particles in a gas flow

US8163161B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jens Schneider · Anderson, US
• Detlef Heimann · Gerlingen, DE
• Goetz Reinhardt · Eppelheim, DE
• Henrico Runge · Stuttgart, DE
• Lothar Diehl · Stuttgart, DE
• Juergen Ruth · Stuttgart, DE
• Thomas Seiler · Stuttgart, DE

Key dates

• Filing date: Nov 25, 2008
• Grant date: Apr 24, 2012
• Expiry date: Jul 25, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/419
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A gas sensor for detecting particles in a gas stream has a first electrochemical pump cell, which has a measuring chamber in which a first electrode is disposed to pump particles between the first measuring chamber and the gas stream. Furthermore, a second electrochemical pump cell is provided, which has a second measuring chamber in which a second electrode is disposed so as to pump particles. The second measuring chamber is connected to the gas stream via an absorber medium for absorption of the particles to be detected. This makes it possible to absorb the particles to be detected in a first operating mode using the absorber medium, and to desorb the absorbed particles in a second operating mode, and to detect the quantity of the desorbed particles. Thus, the gas sensor is able to take even low concentrations into account, and short-term measuring errors do not have such a serious effect.