Non-dispersive infrared gas sensor
US6469303B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | May 17, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3166
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NDIR sensor includes a cylindrical metallic tube, a printed circuit board platform that fits into one end of the tube, a diffusion filter that fits into the opposite end of the tube, and an optical system. The optical system includes an infrared source on the platform, a mirror on the inner wall of the tube so as to reflect and focus the infrared light from the infrared source, and a detector assembly that receives the infrared light after reflection. The gas sensor may further include a partition between the infrared source and the detector assembly, a removable filter on the diffusion filter, connecting pins attached to the platform, and a sealing layer formed under the platform. The detector assembly includes a signal detector and a reference detector. A first and second bandpass filters are respectively formed on the signal and reference detectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.