Method and device for converting thermal images into secondary images, e. g. visible images
US4275302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1979 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Sep 24, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/50
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A converter and method of converting thermal images into secondary images, e.g. visible images. The infrared radiation emitted by an object is focused by an optical system to form a thermal image on the free surface of a thermal radiation absorbing layer to one side of a liquid-liquid interface which has low surface tension and is a mixture of two liquid partially miscible at operating temperature and pressure. To convert the thermal image to a visible a parallel beam of light or a beam of light from a point source in the visible range is directed to the other side of the interface and, depending on the selected indices of the interface liquids and whether a prism is used or not; is either transmitted or reflected. The emerging transmitted or reflected beam is then received on a screen or in a detection system where variations of the optical properties of the emerging beam are observed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.