What is Globar?
Globeman is a heated silicone carbide rod used as thermal radiation with emissions in the frequency range of the middle infrared (IR). Globar is used in conjunction with a dichroic or interference filter to emit IR radiation in the middle IR spectrum. This emitted IR radiation is used in infrared spectroscopy as a diagnostic and measuring tool in research, industrial and forensic analytical applications. Due to the lack of oxidation of the rod in the air, the global may not be closed in vacuum tubes, as is the case with alternative IR light sources. Thermal radiation is not the same as the thermal energy that feels like heat, but rather electromagnetic emissions in the infrared spectrum of invisible light. All materials reflect all materials or absorb this radiation differently depending on the exact wavelength of the emissions and the type of material. These known factors allow the use of infrared radiation as a diagnostic tool in science of spectroscopy. When is gLobar paired with an interference filter, emits thermal radiation in the middle spectrum of IR range at approximately 4 to 15 micrometers.
Heated material used in Globar is a silicone carbide in the form of a small rod usually 0.2 to 0.4 inches (5-10 mm) in diameter and a length of 0.8 to 1.2 inches (20–50 mm). To start the radiation process, the rod is electrically heated to 1,832 ° to 3,002 ° Fahrenheita (1,000 ° - 1,650 ° C). Due to the lack of oxidation of the silicone carbide in the air at these temperatures, it is not necessary for the rod to be closed in the vacuum tube. If it is closed, it is simply as a safety measure. A interference filter is located between the globar and the test sample, which produces a specific, known IR wavelength used to perform tests.
Used alternative medium emiterv infrared spectroscopy include coils of chrome nickel alloy, high -pressure mercury LAMYP and older lamps Nernst. However, Globar is one of the more practical and efficient sources of medium range, especially in the new generation of portable spectroscopic devices. The name of Globar is also a trademark of a number of silicone carbide resistors produced by several companies. Technically, however, the term correctly refers to the IR emitter application and the link to the Globar resistor is only a business name.