Intrinsically safe NDIR gas sensor in a can
US8415626B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2011 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Aug 26, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/1461
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NDIR gas sensor is housed within a mechanical housing made up of a header housing, a can mounted to the header housing, and a sample chamber mounted above the can. The can has a top surface with a pair of windows formed in it to allow radiation to enter and return from the sample chamber. An electronics module is mounted on a printed circuit board hermetically sealed within the can. A signal channel path length detected by the signal detector is greater than a reference channel path length detected by the reference detector and an absorption bias between the signal and reference outputs can be used to determine a gas concentration in the sample chamber. Both the signal detector and the reference detector have an identical narrow band pass filter with the same Center Wavelength (“CWL”), Full Width Half Maximum (FWHM) and transmittance efficiency at the CWL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.