Infrared source for spectrometers
US6921910B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 2003 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Jan 22, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/108
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A source for reducing drift of a hot spot by producing infrared (IR) light with an insulating housing; an electrical power supply; first and second resistance elements having first and second resistivities; a third resistance element having a third resistivity; the third resistance element disposed between the first and second resistance elements, with the resistivity of the third resistance element having a value greater than the resistivity of both the first and second resistance elements. Alternatively, the first and second resistance elements can have cross-sectional areas that are greater than that of the third resistance. A method of reducing drift of a hot spot in a radiating element of a source of IR illumination by applying constant polarity substantially constant direct current from the power supply and reversing polarity in less than 24 hours, by a square wave AC source, or a Class E amplifier at constant power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.