Color control system for optical image apparatus
US3945731A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1974 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Aug 1, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/4238
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an optical apparatus of the Fourier transform type employing a plurality of individual light sources arrayed about the optical axis of the apparatus, a control subsystem for all the light sources samples light from the light sources selectively. In the illustrated embodiment, a pellicle deflects a minor fraction of the source light to a spatial filter which passes a selected sample or samples to a group of spectrally filter photodiodes, which respond with currents that are fed to a photometric circuit and means to display measured quantities to an operator. The apparatus includes operator controllable means to adjust the intensity of each supervised light source independently of the others. A primary light source, from which the individual light sources are derived, is also supervised, to provide a basis for taking into account variations in energizing voltage, and dimming of the primary source with age.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.