- Globar
A Globar is a
silicon carbide rod of 5 to 10 mm width and 20 to 50 mm length which is electrically heated up to 1000 to 1650 °C (1800 to 3000 °F). When combined with a downstream variableinterference filter , it emitsradiation from 4 to 15micrometre swavelength . Globars are used asthermal light sources forinfrared spectroscopy because their spectral behaviour corresponds approximately to that of aPlanck radiator (resp.: black radiator). Alternative middle-infrared luminous sources areNernst lamp s, coils of chrome-nickel alloy or high-pressure mercury lamps.The
technical term "Globar" is an Englishportmanteau word consisting of "glow" and "bar". Hence, the term "glowbar" is often used synonymously in the English-speaking area (which is an incorrect spelling in the strict sense).The "American Resistor Company" in
Milwaukee ,Wisconsin , had word and lettering "Globar" registered as a trademark (in a special decorative script font) with theUnited States Patent and Trademark Office on June 30, 1925 (registration number 0200201) and on October 18, 1927 (registration number 0234147). This registration had been renewed for the third time in 1987 (by various companies throughout 60 years).See also
*
Nernst lamp
*Nernst glower
*List of light sources External links
* [http://www.cesiwid.com/ehe/globar.php.html Kanthal Globar] Official website of producer
* [http://infrared.als.lbl.gov/viewgraphs/ Viewgraphs about infrared beamlines and IR spectroscopy] Advanced Light Source, San Francisco
* [http://www.ir-spektroskopie.de/spec/basics/#2 Introduction to the optical principles of IR spectroscopy, light sources] Ralf Arnold (in German)
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