Globar
Encyclopedia : G : GL : GLO : 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) with a downstream variable interference filter that emits radiation from 4 to 15 micrometres wavelength. Globars are used as thermal light sources for infrared spectroscopy because their spectral behaviour corresponds approximately to that one of a Planck radiator (resp.: black radiator). Alternative middle-infrared luminous sources are Nernst lamps, coils of chrome-nickel alloy or high-pressure mercury lamps.
The technical term Globar is an English portmanteau 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 the United 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 divers companies throughout 60 years).
A Night Club Service in Las Vegas and a certification company in Bologna, Italy, have the Mark Drawing Code registered too. The Polish company Globar Sp.Jawna, which sells sewing machines from Kraków all over Poland since 1992, secured itself a homonymic URL [link]. The corresponding Italian URL is used by a shopfitting company in the Calabrian small town Castrovillari [link].
See also
External links
- [Website of the producer Kanthal Globar, 495 Commerce Drive - Ste. 7, Amherst, NY (a Sandvik Group Company, Sweden)]
- [Viewgraphs about infrared beamlines and about IR spectroscopy (among others with Globars), Advanced Light Source, San Francisco]
- [Ralf Arnold: Introduction to the optical principles of IR spectroscopy, light sources (in German)]
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