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Nernst Glower

Nernst Glower. Derived from German chemist Walther Hermann Nernst, who derived the Nernst equation. Used in spectroscopy to provide near infrared radiation. They have a large negative temperature coefficient of electrical resistance and must be preheated to be conductive. How it Works.

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Nernst Glower

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  1. Nernst Glower • Derived from German chemist Walther Hermann Nernst, who derived the Nernst equation. • Used in spectroscopy to provide near infrared radiation. • They have a large negative temperature coefficient of electrical resistance and must be preheated to be conductive.

  2. How it Works • Basically, a Nernst glower is a cylindrical rod or tube composed of rare earth oxides such as zirconium oxide(ZrO2), yttrium oxide (Y2O3) and erbium oxide (Er2O3). • Platinum leads at the ends of the cylinder permit the passage of electricity. • Causes light production similar to blackbody radiation.

  3. Operated at temperatures from 1500-2000K. • Operates best in wavelengths from 2 to 14 micrometers. • Even at extremely high temperatures, a Nernst glower is useless in infrared spectroscopy if wavelength drops well below this range.

  4. Nernst Glower vs. Globar • The two light sources are similar in many ways, such as the function and temperature range. • However, the Nernst glower is better used at shorter IR wavelengths (near IR), whereas globar is better used at longer IR wavelengths.

  5. Advantages • Requires less power than a globar • Lasts a lifetime • Operates in air

  6. Disadvantages • Very expensive ($6850) • Extremely fragile • Because it is operated in the air, which is an advantage, if the temperature becomes too high, it will burn up, which is obviously a disadvantage.

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