Spectrometer using concave holographic diffraction grating
US4815849A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1987 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Dec 30, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/2803
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectrometer including a source of light, a slit member along the path of the light emitted from the source, a holographic, concave grating in the path of the light passing through the slit member, and a photodetector in the path of the diffracted light reflected from the grating. The photodetector is positioned substantially along the portion of the primary horizontal focal curve of the grating where it is intersected three times by a vertical focal curve of the grating. The three intersections being on the same side of the normal vector to the grating and two of the intersecting points being the positions of the laser used to form the grating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.