Patent · US Expired

Method and apparatus for continuously measuring the concentration of a gas component

US4849637A · kind A · utility

27Cited by

6References

11Claims

0Family size

Assignee

Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

Karlheinz Cerff · Kandel, DE
Helmut Giraud · Blankenloch, DE
Gunther Krieg · Karlsruhe, DE

Key dates

Filing date	Oct 2, 1987
Grant date	Jul 18, 1989
Priority date	—
Expiry date	Oct 2, 2007

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/39
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method and appparatus for continuously measuring the concentration of at least one component of a gas sample by means of a laser for the purpose of charging the gas sample with radiation at a frequency in the range of an absorption line of the component, and employing a detector device for receiving a measurement signal corresponding to the intensity of the transmitted radiation and an evaluation circuit. A single mode laser is employed which is linearly tuned about a gas specific absorption line by means of bandwidth modulation so that at least two different intensity measurement values are obtained for the transmitted radiation from which the extinction, and thus the concentration of the gas component, is determined.

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