Ensuring stable, precise, and accurate optical absorption spectroscopic trace gas concentration measurements in the presence of time-varying etalons
US10082457B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2015 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Jul 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided herein are techniques for improved optical absorption measurements in the presence of time-varying etalons. In one aspect, a method for dynamic etalon fitting for adaptive background noise reduction in an optical sensor is provided. The method includes the steps of: obtaining a zero-gas spectrum measured using the optical sensor; obtaining an analyte gas spectrum of a target trace gas measured using the optical sensor; comparing the zero-gas spectrum and the analyte gas spectrum using fit parameters that compensate for drifting etalons in the optical sensor; and dynamically extracting the drifting etalons from the analyte gas spectrum to retrieve concentration of the target trace gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.