Spectrum measuring equipment utilizing double-image polarizing element
US5080486A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 12, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Sep 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/0224
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In spectrum measuring equipment the light to be measured is separated by a double-image polarizing element into two polarized wave components whose planes of polarization cross each other perpendicular and which have different optical axes. The two polarized wave components are applied to a dispersing element so that their planes of polarization intersect the direction of light separation at .+-.45.degree. thereto, respectively. The sum of optical powers of the two polarized wave components separated by the dispersing element is measured by a photodetector, so that spectrum measurement independent of the polarization of the light to be measured can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.