Non-dispersive infrared (NDIR) gas sensor
US8471208B1 · kind B1 · utility
5Cited by
4References
20Claims
0Family size
Inventor
Key dates
| Filing date | Mar 2, 2011 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | May 11, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/052
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-dispersive infrared gas sensor provides the same light path for light used in a reference mode and a test mode for testing for the presence or concentration of one or more gases. A vacuum is formed in the light pipe in the reference mode. Gas flows into the light pipe before the test mode. The same emitter and detector maybe used for both the test and reference modes. The emitter transmits an electromagnetic wave through the light pipe in both the reference and test modes. The detected signals in both modes are compared to determine the concentration or presence of gas in the light pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.