Globar

A Globar is used as a thermal light source for infrared spectroscopy. The preferred material for making Globar is silicon carbide that is shaped as rods or arches of various sizes. When inserted into a circuit that provides it with electric current, it emits radiation from ~ 2 to 50 micrometres wavelength via the Joule heating phenomenon. Globars are used as infrared sources for spectroscopy because their spectral behavior corresponds approximately to that of a Planck radiator. Alternative infrared 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. The term glowbar is sometimes used synonymously in English.
The American Resistor Company in Milwaukee, Wisconsin, had word and lettering Globar registered as a trademark with the United States Patent and Trademark Office on June 30, 1925 and on October 18, 1927. This registration had been renewed for the third time in 1987.