Method and apparatus for nox analysis
US3970430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Oct 17, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/177692
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and method for NO.sub.x analysis in which a sample gas is introduced into a sample cell and mixed with oxygen to induce conversion of NO to NO.sub.2. After a given time, prior to complete conversion of NO to NO.sub.2, the absorbance and the time rate of change of absorbance is measured. The time rate of change of absorbance is indicative of the initial NO concentration in the sample gas; and the sum of the absorbance and the time rate of change of absorbance is indicative of the initial NO.sub.x concentration in the gas. A better indication of the initial NO.sub.x concentration can be obtained from the sum of the absorbance and the square root of the time rate of change of absorbance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.