Thermograph absolute temperature referencing technique
US3935382A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Mar 4, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/23
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An infrared imaging system (thermograph) that electronically forms an optical display of an object as viewed in the infrared portion of the spectrum wherein a given brightness level of the optical image may be set to correspond to a particular object temperature. A reference object (target) within the thermograph is periodically imaged simultaneously with the electronic video circuits being reset to a reference voltage proportional to the absolute temperature of the target. Temperature variations of the target during a period use of the thermograph thus does not affect the brightness level of the optical images, and the optical image brightness becomes a measure of the absolute temperature of the optical image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.