Globar
Globar has come into common usage as a trademark for resistance heating elements made of silicon carbide . With such heating elements, comparatively high temperatures can also be achieved in air (influence of oxygen). Globars are also used as a source of radiation in the mid and far infrared .
Structure and application
The Globar is a silicon carbide rod, electrically heated to 980 to 1650 degrees Celsius, approx. 5–8 mm wide and approx. 20–50 mm long, which emits radiation with a wavelength of 4 to 15 µm due to its high emissivity.
Globare other than as a heating element for high temperature furnaces in an oxidizing atmosphere in the infrared spectroscopy as thermal light sources used because their spectral approximately behavior to that of a Planckian radiator (or black body equivalent). Alternative light sources in the mid-infrared are Nernst pins or coils made of chrome-nickel alloys .
Surname
The artificial word Globar originates from the English and is based on the contraction of two words "glow" (dt. "Annealing" ) and "bar" (dt. "Stab" ); so it is also a suitcase word . In the English-speaking world, the (incorrect) spelling “glowbar” is therefore often used.
The American Resistor Company in Milwaukee , Wisconsin , to let the Word and the lettering Globar (in a Schreibschrift- font ) at the United States Patent and Trademark Office on June 30, 1925, the registration number 200201 and on 18 October 1927, No. Register 234147 as a registered trademark . Today the brand is owned by Sandvik AB (Sweden)
Web links
- Ralf Arnold: Introduction to the optical basics of IR spectroscopy. - 2nd light sources (photo and sketch)
- Lydia Suemmchen: IR device technology , see thermal emitters (FIZ CHEMIE Berlin)
- Website of the manufacturer Kanthal Globar, 495 Commerce Drive - Ste. 7, Amherst, NY (a Sandvik Group Company, Sweden)