Controlling light beam spectrum
US4660975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1984 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Jul 13, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/1278
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for controlling the spectral components of a light beam are described. The apparatus comprises means (3-7) for generating a collimated light beam; means (9) for dispersing the collimated beam; a mask (1) including an aperture (2) the size of which is such that a portion of the dispersed beam passes through the aperture in use; and movement means (not shown) for causing relative transverse movement between the light beam and the aperture. A memory (not shown) is provided for storing in use a profile of the relative transverse movement between the light beam and the aperture (2) required to obtain a desired spectral response in the transmitted light beam, the movement means being responsive to the stored profile to cause relative transverse movement in accordance with the predetermined profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.