Electromagnetic wave reflections absorber
US4494873A · kind A · utility
13Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1981 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Feb 17, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photon absorber minimizes the mixing of unwanted reflected electromagnetic waves with the main clockwise and counter-clockwise propagating electromagnetic waves of a ring laser gyroscope. A round hole in the middle of the absorber allows the main waves to pass and an angulated front surface deflects reflected waves away from the main waves. Most of the reflected waves which impinge on the photon absorber are absorbed. A photon absorber is fabricated from light absorbing filter glass with anti-reflection coatings or from beryllium-copper with an absorptive coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.