Varying bandpass of optical spatial filter by rotating mirrors having changing reflectivity
US4448486A · kind A · utility
9Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1982 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Jan 6, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a system of real-time coherent optical filtering of visual imagery having a Fabry-Perot interferometer for use as a variable bandpass spatial filter, the improvement of having the pair of mirrors of the interferometer mounted in spaced parallel relationship to one another for rotation about a common axis. The mirrors each have a reflectivity value which changes as a function of rotation. Thus, the bandwidth of the interferometer in acting as a filter can be adjusted by merely rotating one or both of the mirrors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.