Nondispersive infrared gas analyzer

US4306153A · kind A · utility

Assignee

• Hartmann & Braun Aktiengesellschaft · DE

Inventors

• Walter Fabinski · Kriftel, DE
• Margareta Ascherfeld · Oberursel, DE

Key dates

• Filing date: Mar 12, 1980
• Grant date: Dec 15, 1981
• Expiry date: Mar 12, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/61
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A two-beam, infrared gas analyzer includes a front and a rear detection cell in each path filled with gas of the type to be detected; and a pressure-differential chamber with capacitor pick-up is connected to these front and rear cells. The rear cells are constructed to ensure substantially complete absorption of all radiation of the absorption band being characteristic of the component to be detected. In one example, filters are interposed between front and rear cells for broadband, i.e., nonselective attenuation. Alternatively, the rear cells are connected to a reservoir of the same gas to attenuate pressure variations. Either case enhances frequency selectivity by reducing cross sensitivity.