Gas analyzer with means for varying angle of incidence of light on interference filter
US4662755A · kind A · utility
10Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Apr 9, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/1243
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas analyzer provided with apertures on the optical paths from a light source through a cell to sensors and multi-layer interference band-pass filters on the respective optical paths. The structure makes it possible to change the distance between each sensor and the corresponding aperture, or the change the size of the aperture, for changing the maximum angle of incidence of light on the filters which is sensed by the sensors to thus change the central wavelength of the filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.