Patent · US Expired

Method for measuring NOx

US6493087B1 · kind B1 · utility

18Cited by

1References

12Claims

0Family size

Assignee

ABB PATENT GMBH · DE

Inventors

Walter Fabinski · Kriftel, DE
Michael Zochbauer · Oberursel, DE
Michael Moede · Schwalbach, DE

Key dates

Filing date	Jul 25, 2001
Grant date	Dec 10, 2002
Priority date	—
Expiry date	Jul 25, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/3504
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for measuring NOx having a specific discharge lamp. The method controls a photometric analysis device, in which an electrically rotatable filter wheel or shutter wheel is used to change various shutters and/or filters in a beam path with beam source, cuvette and detector. The filter and/or shutter wheel is controlled in such a way that the measurement time is greater than the transfer time. This control improves the detection limit of the NOx resonance absorption method.

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