Exterior aircraft lighting device
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United States of America Patent
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Dec 19, 2017
Grant Date -
Nov 24, 2016
app pub date -
May 19, 2016
filing date -
May 20, 2015
priority date (Note) -
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Abstract
An exterior aircraft lighting device comprises: at least one light source; an optical element having a light entry side facing the at least one light source and a light exit side and being configured for modifying light emitted by the at least one light source; at least one photo detector, which is configured and arranged for detecting a portion of the light emitted by the at least one light source, which is reflected by the light entry side of the at least one optical element, the photo detector providing a detection value, representing the amount of detected light; and a control and evaluation unit which is configured for evaluating the state of wear of the at least one light source based on the detection value provided by the at least one photo detector.
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