Infrared source for spectrometers

Details Infrared source for spectrometers Infrared source for spectrometers

2005-07-26

2005-07-26

Lee, John R. (Department: 2881)

Radiant energy

Radiant energy generation and sources

With radiation modifying member

C250S493100, C219S553000

Reexamination Certificate

active

06921910

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.

REFERENCES:
patent: 4935633 (1990-06-01), Curbelo et al.
Product brochure for Norton 301 (now Saint-Gobain Advanced Ceramics, Inc., New Milford, New Hampshire 03055).

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