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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