Nondispersive infrared gas analyzer

US4288693A · kind A · utility

Assignee

• Hartmann & Braun Aktiengesellschaft · DE

Inventors

• Walter Fabinski · Kriftel, DE
• Udo Deptolla · Nieder-Olm, DE

Key dates

• Filing date: Jun 7, 1979
• Grant date: Sep 8, 1981
• Expiry date: Jun 7, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/37
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The cross sensitivity of a two-beam infrared gas analyzer is eliminated by using two differently long cells for the measuring gas in the two beam paths and by using an interference filter at least in the beam path containing the longer cell; the filter, however, does not filter the entire beam in that path.