Broad spectrum spectrometer apparatus
US5784158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Nov 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention is for a broad spectrum apparatus that provides a substantially uniform spectral response from a spectrometer by introducing one or more elements whose combined response or correction factor is the inverse of that produced by the rest of the apparatus. The response of the elements can be formed either pre or post dispersion. In the case of pre-dispersion the correcting components may be optical components chosen from a full combination of optical filters, either purely transmissive or a combination of transmissive and reflective as in the case of dichroic mirrors, optical lenses with chromatic aberration, integrating spheres or other diffusers coated with material whose response is wavelength dependant. The post-dispersive application may involve a spatial filter or shaped aperture to partially block the more intense wavelengths. A particular attractive application may be a mask that is directly etched onto the surface of a CCD array detector. Post-dispersive applications may also include custom neutral density filters or variable neutral density filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.