Applied Scientific Research, Section B

, Volume 4, Issue 1, pp 289–299 | Cite as

A double-beam method of spectral selection with flames

  • C. T. J. Alkemade
  • J. M. W. Milatz


A non-dispersive, optic-electrical filter instrument is described, which combines high spectral resolving power (~ 0.1 Å) with large luminosity, at wavelengths which are of interest in spectrochemistry. The method is based on the balance of two light-beams emitted by a source S, which are periodically chopped in opposite phase. By placing a flame A containing vapour of some element into one light-beam, this balance is made critical for wavelengths that are specifically absorbed by this vapour. The applicability of a self-radiating flame as absorber could be realized by making use of an a.c. measuring device and by choosing a suitable position of the light-chopper. The described test experiments, which were made with a provisional instrument, prove the applicability of this method, especially in flame photometry.


Sodium Content Flame Photometry Discharge Lamp Sodium Lamp Spectral Selectivity 
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Copyright information

© Martinus Nijhoff 1955

Authors and Affiliations

  • C. T. J. Alkemade
    • 1
  • J. M. W. Milatz
    • 1
  1. 1.Physisch Laboratorium der Universiteit UtrechtNederland

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