MAI Zhen-qiang, LI Feng-you, REN Jian-wei, WAN Zhi, LI Xian-sheng. The Long Term Working Stability of Spaceborne Calibration LED Light Source[J]. Chinese Journal of Luminescence, 2007,28(5): 748-753
MAI Zhen-qiang, LI Feng-you, REN Jian-wei, WAN Zhi, LI Xian-sheng. The Long Term Working Stability of Spaceborne Calibration LED Light Source[J]. Chinese Journal of Luminescence, 2007,28(5): 748-753DOI:
In order to serving the space camera developing mission
it is necessary to study the feasibility of using LEDs as spaceborne calibration light sources.Structures of LEDs are introduced.The effects of deep level on LEDs’ radiant efficiencies are theoretically analyzed.The LED’s degradations with time are studied using Arrhenius model.In order to obtain the long hours working stability of LEDs
we designed an aging experiment for LEDs
Using Integrating Sphere to measured the Relative Radiant Intensity (RRI) of LEDs regularly.Then
the trends and the LEDs RRI curves via time are studied.Experimental results show that the LED RRI changes significantly during early aging.After 250 h continuous test
changes become stable.The total radiant attenuation of the relative intensity is less than 3% after 3 000 h aging and the changes of peak-value are less than 1.5%.The results agree with the requirement of spaceborne calibration.As a calibration reference