Method and system for measurement and correction of thermally induced changes of boresight, effective focal length, and focus
US8416404B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 2008 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | May 22, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and system are for measuring and correcting shifts in the boresight, effective focal length, and focus of an optical system that are caused by temperature variations. The method can be used for systems which can be expected to operate in situations where the temperature variations are large, e.g. a FLIR system of a fighter plane, and also where the temperature variations can be very small however high accuracy is needed. The invention is based on placing radiation emitting sources before and as close as possible to the first optical element of the optical system and measuring the thermally induced shifts of the locations of the images of the radiation emitting sources on the surface of the detector of the optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.