Integrated test target assembly and compact collimator
US5416332A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1993 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Oct 1, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41G7/004
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved wide-spectrum test target assembly, with visual and near IR (infrared) targets integrated with a long wavelength emissivity target. A single relatively thick optical fiber (78) is used to receive target signals emitting from several thinner fibers (72, 74, 76), each carrying a signal of different wavelength. The integrated signal is then relayed to an aperture (108) of an emissivity target through a gradient index lens (88) to further combine with the long wavelength target signal emitted from the emissivity target assembly (100). By selecting appropriate numerical apertures and diameters of the fibers, relatively high power output is achieved. A light collimator (200) is also disclosed for collimating light generated by the test target assembly to simulate targets at infinity. The collimator includes a primary mirror (220) which is an off-axis section of a paraboloidal mirror, a secondary mirror (230) which is an off-axis section of a hyperboloidal mirror, and a support structure/baffle (210) which supports the mirrors in proper relation and also includes an integrated light baffle surface to prevent light from the test target assembly from passing directly to an image…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.