Abstract

A closed loop feedback system for stabilizing the radiant flux of a xenon arc lamp is described. Stabilization is accomplished by focusing the image of the arc onto a photodiode, the current output of which is amplified and used to modulate the arc current in a dc controlled power supply. The feedback control eliminates light intensity spikes and drift and significantly reduces noise. The lamp characteristics (current, voltage, radiant flux) were recorded under controlled and uncontrolled operating conditions.

© 1981 Optical Society of America

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References

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  1. R. J. Douglas, T. Timusk, Appl. Opt. 13, 723 (1974).
    [CrossRef] [PubMed]
  2. D. D. Klug, E. Whalley, J. Opt. Soc. Am. 64, 1019 (1974).
    [CrossRef]
  3. R. E. Pulfrey, Appl. Opt. 15, 308 (1976).
    [CrossRef] [PubMed]

1976 (1)

1974 (2)

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Figures (7)

Fig. 1
Fig. 1

Light intensity stabilized xenon illumination system.

Fig. 2
Fig. 2

Photodiode op-amp schematic.

Fig. 3
Fig. 3

Modulator op-amp schematic.

Fig. 4
Fig. 4

Light output at a 150-W Xe discharge lamp with/without photodiode feedback control.

Fig. 5
Fig. 5

Recorder traces of arc current and voltage.

Fig. 6
Fig. 6

Recorder traces of light intensity and arc current in the absence of feedback control.

Fig. 7
Fig. 7

Light intensity of Xe arc lamp as a function of power with and without feedback control.

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