Multi-wavelength based ozone measurement method and apparatus
US6010665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1997 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Oct 17, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/31
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods for providing an ultra-stable measurement of the density of a fluid/gas species such as ozone in a mixture. The technique is based on information extracted from multi-wavelength light absorption, at which the species exhibits different absorption properties (coefficient values). The technique provides real-time compensation for short- and long-term instability in the light source and detector, and for detectable changes in the optical characteristics of the cell, thus improving the accuracy of the measurement while making frequent zeroing of the instrument unnecessary. In addition, the invention provides a high-performance technique for measuring ultra-high ozone densities using absorption at the Chappuis band. The invention provides in an embodiment a system and method for detection of a gas component such as ozone in a gas mixture utilizing a light source providing light output in the visible spectrum corresponding to maximum and minimum absorption wavelengths for the gas component of interest. A process gas containing ozone or other gas component to be measured is supplied to a cell or cuvette having an optical input end and an optical output end. The light s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.