Modified concentric spectrograph
USRE42822E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2001 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Nov 30, 2021 |
Classification
- Technology area (CPC —)General
Abstract
A modified concentric spectrograph for diffracting light with high stray light rejection without astigmatism is provided. The modified spectrograph includes a grating, a lens, and at least one entrance port and one exit port. The grating has a concave surface and a meridian plane with a first side and a second side. The lens has a substantially planar surface and a convex surface. Preferably, the convex and concave surfaces are substantially concentric. The ports are substantially located on different sides of the meridian plane near a focal plane of the spectrograph. The position of a focal plane may be modified using an optically transmissive triangular prism with a reflective surface, and an optically transmissive block. The position of a focal plane may further be modified with one or more optically transmissive plates. Methods for using the spectrograph are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.