Stigmatic imaging with spherical concave diffraction gratings
US5066127A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1989 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Aug 29, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/2813
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved method and apparatus for focused stigmatic imaging with spherical concave diffraction gratings incorporates a concave spherical diffraction grating with parallel, normally ruled lines. An entrance light beam source or projector propagates a beam of light to be analyzed through an entrance point and onto the surface of the diffraction grating. A light detector or analyzer is positioned at or near a detection point for detecting or characterizing the light diffracted from the grating. The entrance point and detection point are positioned in spaced-apart relation to each other and to the grating according to disclosed formulae, such that they are in respectively corresponding stigmatic or near stigmatic focus with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.