Concentric spectrometer
US6181418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1998 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Mar 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A concentric spectrometer which reduces stray light and re-entrant spectra within the spectrometer. The spectrometer includes a non-direct optical path between the entrance slit assembly and exit aperture. Dyson and Offner concentric optical configurations are used to eliminate third-order aberrations The concentric optical system includes a light trap which mitigates or eliminate stray light due to reflection of light incident on the exit aperture region but which does not impinge on the active area of a detector optically coupled to the exit aperture. A two-dimensional area array detector concurrently senses a spectral signal corresponding to an input optical radiation signal and a signal corresponding to zero-input radiation, and the spectral signal is corrected according to the zero-input radiation signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.