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By use of dual atomic absorption lines with a two-element hollow cathode lamp, a simple method was developed for air/acetylene flame temperature measurement. The results are comparable to literature values with a peak temperature at about 2400 K. The spatial temperature variation of a fuel-rich flame was investigated, and it was found that the tendency for variation conformed to the flame combustion process. The proposed method was compared to the traditional dual-line atomic absorption method of indium and showed a similar tendency of temperature variation. The proposed instrumental setup is simple, which uses a Cu/Fe two-element hollow cathode lamp, a handheld charge coupled device detector, an optical fiber and a computer. Due to its simplicity, non-contact and portability, this technique is promising for flame temperature characterization of various kinds of flames or electrothermal atomizers.

Measurement of Flame Temperature Using Simultaneous Dual- line Atomic Absorption of Two Elements