Thermal imager
US4933555A · kind A · utility
50Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Feb 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/528
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thermal imager including a cryogenically cooled detector element array and a scanning element has an optical system with a field of view limited by a field stop (2). A retroreflective region (6) is provided on part of the field stop to act as a temperature reference by allowing the detector array to "look at" itself. A second, different temperature reference (5) is provided on another part of the field stop and the two references are used to equalize and adjust the output characteristics of the elements in the detector array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.