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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 (i.e. a black body). 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 various companies throughout 60 years). == See also == * Nernst lamp * Nernst glower * List of light sources 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Globar」の詳細全文を読む スポンサード リンク
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