Gas sensor with increased measuring sensitivity

US7257986B2 · kind B2 · utility

Assignee

• DRÄGER SAFETY AG & CO. KGAA · DE

Inventors

• Stephan Haupt · Lübeck, DE
• Michael Sick · Timmendorfer Strand, DE
• Rigobert Chrzan · Bad Oldesloe, DE
• Andreas Nauber · Wulfen, DE
• Dieter Kruger · Dinslaken, DE
• Christoph Bernstein · Wulfen, DE
• Wilfried Diekmann · Wulfen, DE

Key dates

• Filing date: Feb 15, 2005
• Grant date: Aug 21, 2007
• Expiry date: Jun 4, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/0016
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A gas sensor (1) with a detector element (2), which is specific to a gas to be measured and sends a measured signal that depends on the measured gas concentration, has increased measuring sensitivity for measurements in the concentration range from less than 1 ppb to a few ppb. The detector element (2) is exposed in a gas admission adapter (4) to a gas to be measured via a diaphragm (3) arranged in front of the detector element (2), wherein the gas admission adapter (4) has at least a first opening (20) for the entry of the gas to be measured as well as at least a second opening (30), which is connected with a pressure modulator, which generates periodic gas pressure vibrations in the gas admission adapter (4) and is designed, for example, as a pump (5).