Method and apparatus for analysis of gas by means of absorption frequency regulation

US4894603A · kind A · utility

Assignee

• Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

• Lutz-Michael Berger · Dresden, DE
• Heimo BRETON · Überlingen, DE
• Helmut Giraud · Blankenloch, DE
• Gunther Krieg · Karlsruhe, DE
• Horst Gunther · Blankenloch, DE
• Gerhard Schmitt · Bensheim, DE

Key dates

• Filing date: Jul 9, 1987
• Grant date: Jan 16, 1990
• Expiry date: Jul 9, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N22/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for analyzing a gaseous medium with respect to a component having a characteristic absorption frequency spectral line, including the steps of generating microwave radiation at a selected frequency, generating a first Stark voltage selected to have a value such that a reference signal produced by subjecting the component to the microwave radiation and the first Stark voltage has a zero passage, resulting from the change in polarity between the spectral line and the Stark voltage lines, at a frequency coinciding with the characteristic absorption frequency spectral line, and regulating the microwave radiation frequency as a function of frequency shifts of the zero passage of the reference signal.