Method and apparatus for the estimation of the temperature of a blackbody radiator
US7001068B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2002 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Feb 1, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Remote sensing of the temperature of a greybody or blackbody radiator is effected by passing its radiation (24) through a modulated infrared filter spectrometer. The infrared filter comprises, in sequence, a band pass filter (20), a first polariser (21) which polarises the radiation, an electro-optical element (22) which splits the polarised radiation into two orthogonally polarised components, and a second polariser (23). A lens (28) images the radiation leaving the second polariser onto a detector (27). The electrical signal from the detector (27) is input to a numerical analyser. The electro-optical element (22), typically comprising a birefringent crystal assembly (25) and a birefringent trim plate (26), is configured so that the net optical delay of the orthogonally polarised components passed through it is such that the recombined components are at or near a peak or trough in their interferogram. A sinusoidally varying voltage is applied to the electro-optical element to modulate the net delay of the components passed through the electro-optical element. The numerical analyser is programmed to compute the harmonic amplitude ratio (the ratio of signal amplitudes at the fundame…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.