【摘要】 对发光二极管作星上定标光源的可行性进行了分析研究。测量了LED的工作稳定性,对LED做了开合试验,讨论了它的电流特性。在真空环境下,分析了LED的冷热特性和抗辐射性能。结果表明,LED持续点燃1 200 h的衰减量<1.2%;其开合重复性很好,但存在10~15 min的不稳定性;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影响LED的发光强度、正向偏压以及峰值波长。真空状态下,由于传输介质不同,LED的发光强度会有所增加,但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%/a。经过分析讨论,证明将LED应用于星上定标是可行的。更多还原

【Abstract】 The feasibility of using a Light Emitting Diode(LED) as calibration source on a spaceborne camera was studied.To discuss the characteristics of the LED,an aging experiment was carried out 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,the temperature characteristics,vacuum and anti-radiation characteristics of the LED were analyzed at the same time.The experimental results show that the lighting attenuations of the LED are less than 1.2% after continuous lighting for 1200 h, and LED has a good reproducibility and a period of 10 to 15 min instability in on-off test.The change of LED current has different effects on its radiant intensity and wavelength;and the change of ambient temperatures will affect its radiant intensity,forward currents and peak wavelength also.Under vacuum,the LED’s radiant intensity increases with different conductive media,and the volatile packaging materials of the LED has a little impact on its characteristics;in the case of radiation protection,the LED’s radiant intensity change is no more than 0.5%/a.This paper comes to a conclution that LED can be used as a spaceborne calibration light source.更多还原