Apparatus and method for using the speed of sound in photoacoustic gas sensor measurements
US8312758B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2008 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Jun 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/1702
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoacoustic gas sensor includes a photoacoustic cell configured to receive a gas mixture having a first gas component and a second gas component. The photoacoustic gas sensor also includes a light source configured to provide light to the photoacoustic cell. The photoacoustic gas sensor further includes a photoacoustic cell controller configured to measure a concentration of the second gas component using a speed of sound through the gas mixture, where the speed of sound is determined based on an absorption associated with the first gas component. In addition, the photoacoustic gas sensor could include a temperature sensor configured to measure a temperature of the gas mixture, where the photoacoustic cell controller is configured to determine the concentration of the second gas component using the speed of sound and the temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.