Abstract
Exciting acoustic resonances (ARs) in High Intensity Discharge (HID) lamps is an important cause of instabilities of the lamp discharge. When conditions for generating ARs are satisfied, the discharge instability occurs only after a time interval (onset time of the AR excitation). Measuring of the onset time for the occurrence of instabilities after satisfying conditions for the excitation of ARs helps in better understanding of this phenomenon. This paper addresses a measuring method for determining this time constant for different AR frequencies. For instance, in this work, an onset time for AR driven instabilities for an OSRAM HCI-T 70W WDL lamp is determined which is below 1 ms. Some other properties of the time response of the lamp discharge to adding or removing of a power ripple, such as its deflection time and its offset time is investigated.
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