We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Globar?

By Paul Scott
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A globar is a heated silicone carbide rod used as a thermal radiation device with emissions in the middle infrared (IR) frequency range. A 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 measurement tool in research, industrial, and forensic analysis applications. Due to the lack of oxidization of the rod in air, globars need not be enclosed in vacuum tubes as is the case with alternate IR light sources.

All heated matter emits thermal radiation to varying degrees. Thermal radiation is not the same as thermal energy which is felt as heat but rather electromagnetic emissions in the infrared spectrum of invisible light. Different materials all reflect or absorb this radiation differently depending on the exact wavelength of the emissions and the type of material involved. These known factors allow infrared radiation to be used as a diagnostic tool in the science of spectroscopy. When paired with a interference filter, a globar emits thermal radiation in the middle spectrum of the IR range at approximately 4 to 15 micrometer wavelengths.

The heated material used in a globar is silicone carbide in the form of a small rod typically 0.2 to 0.4 inches (5–10 mm) in diameter and 0.8 to 1.2 inches (20–50 mm) in length. To start the radiation process, the rod is electrically heated to between 1,832° to 3,002° Fahrenheit (1,000° - 1,650° Celsius). Due to the lack of oxidation of silicone carbide in air at these temperatures, there is no need for the rod to be enclosed in a vacuum tube. If it is enclosed, it is simply as a safety measure. An interference filter is placed between the globar and the test sample which produces a specific, know IR wavelength used to conduct the tests.

Alternate middle IR emitters used in infrared spectroscopy include chrome nickel alloy coils, high pressure mercury lamps, and older Nernst lamps. The globar is, however, one of the more practical and efficient sources of mid range IR radiation particularly in the new generation of portable spectroscopy equipment. The name globar is also a trademark of a range of silicone carbide resistors produced by several companies. Technically the term correctly refers to the IR emitter application, however, and the globar resistor reference is merely a trade name.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.