Patent · US Expired

Method and apparatus for analysis by means of microwaves

US4972699A · kind A · utility

7Cited by

2References

14Claims

0Family size

Assignee

Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

Lutz-Michael Berger · Dresden, DE
Gunther Krieg · Karlsruhe, DE
Gerhard Schmitt · Bensheim, DE

Key dates

Filing date	Mar 17, 1989
Grant date	Nov 27, 1990
Priority date	—
Expiry date	Mar 17, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG01N22/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for analyzing a gas by means of microwave absorption including the steps of: generating a microwave at at least one frequency; continuously sweeping the microwave frequency over the absorption frequency of a known pure gas component; transmitting the microwave frequency to a measuring cell containing the gas to be measured and to a reference cell containing the known pure gas component; detecting an absorption measurement signal from the measuring cell; detecting an absorption reference signal from the reference cell; integrating the intensity of the measurement signal; and applying an alternating Stark voltage with a phase shift to the measuring cell and to the reference cell. Also provided is an apparatus which may be used in conjunction with this method.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.