星上LED定标光源可行性研究

发光二极管一直以来还没有被应用于星上定标，本文将针对其用做星上定标光源的可行性进行分析研究。首先针对LED的各项特性逐一进行分析讨论。通过老练试验测量了LED长时间的稳定性；对LED进行了开合实验；讨论了LED的电流特性；针对空间环境下的各种影响，对LED的冷热特性、真空特性、抗辐射特性进行了分析。实验得出 LED持续点燃1200h的衰减量少于1.2% ；发现其开合重复性很好，但存在10到15分钟的不稳定期；改变电流会引起LED发光强度和波长不同程度的变化；温度的变化也同样会给LED的发光强度、正向偏压以及峰值波长带来不同程度的影响；真空状态下，由于传输介质不同，LED的发光强度会有所增加，其封装材料真空挥发产生的影响不大；在抗辐射外壳的保护下，空间辐射对LED发光强度的影响不超过0.5%/year。经过分析讨论，证明将LED应用于星上定标是可行的。

The feasibility research of LED light source in spaceborne calibration

Light emitting diode had never been used as spaceborne calibration source before. In this paper, the feasibility of using LED as calibration source was studied. Discussing the Characteristics of LED, we used aging experiment to measure the LED long term working stability. Then, the LED current characteristic was discussed. As the calibration source characteristics would be changed in space environment, LED’s temperature characteristics, vacuum and anti-radiation characteristics were analyzed at the same time. Experimental results showed that continuous lighting for 1200 hours, LED’s attenuations were less than 1.2%., and LED on-off tests’ results showed a good reproducibility, but a period of 10 to 15 minutes instability. Changed LED’s currents had different effects on their radiant intensity and wavelength. Changed LED’s ambient temperatures would affect their radiant intensity, forward currents and peak wavelength positions. Under vacuum, as different conductive media, LED’s radiant intensity increased, and the volatile of LED’s packaging materials have little impact; In the case of radiation protection, LED’s radiant intensity change was no more than 0.5% / year in space radiation effects. General speaking, LED was competent for using as spaceborne calibration light source.