Lamps Nernst-type

In the mid-IR several type of sources are used. They are either a lamp filament (Figure 10.13), or a hollow rod, 1-3 mm in diameter and 2 to 4 cm long, made of fused mixtures of zirconium oxide or rare earth oxides (Nernst source) heated by Joule effect by the means of an internal resistor (for example Globar ). These sources are heated to 1500 °C, without a protective shield. They dissipate power of the order of a hundred watts by emitting radiation over a large domain ranging from visible to thermal IR. A maximum is observed for A = 3000/T (A in... 

Sources Commonly Used. Analytical instruments most commonly use either a Nernst glower, a Globar, or a wire-coil source. In the near infrared, tungsten lamps such as the type used for projectors are frequently adapted. 

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