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Describing a Real Source 1) Identify m of real source and adjust T in to line up m 2) The ratio of: 3) Measure T w ( ) to calculate  ( ) Ingle and Crouch,

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Presentation on theme: "Describing a Real Source 1) Identify m of real source and adjust T in to line up m 2) The ratio of: 3) Measure T w ( ) to calculate  ( ) Ingle and Crouch,"— Presentation transcript:

1 Describing a Real Source 1) Identify m of real source and adjust T in to line up m 2) The ratio of: 3) Measure T w ( ) to calculate  ( ) Ingle and Crouch, Spectrochemical Analysis

2 Nernst Glower Rare earth oxides formed into a cylinder (1-2 mm diameter, ~20mm long) Pass current to give: T = 1200 – 2200 K Can operate in air (no need for glass/quartz enclosure) Ingle and Crouch, Spectrochemical Analysis Douglas A. Skoog and James J. Leary, Principles of Instrumental Analysis, Saunders College Publishing, Fort Worth, 1992.

3 Globar Silicon Carbide Rod (5mm diameter, 50 mm long) Heated electrically to 1300 – 1500 K Positive temperature coefficient of resistance Electrical contact must be water cooled to prevent arcing Ingle and Crouch, Spectrochemical Analysis

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