Globar
A Globar is used as thermal light source for infrared spectroscopy. It is a silicon carbide rod of 5 to 10 mm width and 20 to 50 mm length which is electrically heated up to. When combined with a downstream variable interference filter, it 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 of a Planck 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.
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.
