Electronic modulation of microwave-excited electrodeless discharge lamps for use in atomic-fluorescence spectrometry.
Electronic modulation of electrodeless discharge lamps has been investigated with respect to frequency of operation and modulation waveform. The optimal frequency of operation was found to be ca. 20,000 Hz, using a square waveform, and modulation was best achieved by adding the modulation waveform to the reference of the stabilizing element in the microwave power supply. Optimal operating conditions have been established for d.c. and a.c. modes of operation for several sources.
Dagnall
R M
RM
Department of Chemistry, Imperial College of Science and Technology, London S.W.7., U.K.
Silvester
M D
MD
West
T S
TS