用于星上定标光源的LED筛选装置

Screening device for LED as spaceborne calibration light source

考虑将发光二极管(LED)用作空间相机星上定标光源时对LED的发光一致性和稳定性的要求,研究了对市售LED产品进行试验和筛选的方法。分析了影响LED发光效率的因素及LED作为星上定标光源需要注意的问题,提出了将多只LED作为空间相机星上定标光源的筛选试验方案,并设计、研制了筛选装置。为了检验LED的工作稳定性和不同LED的发光一致性,该装置可同时监测多只LED的发光状态,并实现了无人值守操控和自动测量。利用该装置对某批次72只随机抽取的白光LED进行测试并根据测试数据对被筛选的白光LED进行了分析计算,结果显示,经过筛选的白光LED在连续点亮900h后,相对光强变化在1.5%左右。最后,从中筛选出符合光源要求的10只LED。

According to the requirements of Light Emitting Diodes （LEDs） for consistency and reliability, when they were taken as a light source in spaceborne calibration, a screening experiment scheme using multiple LEDs as spaceborne calibration light source was proposed, and a screening device was developed. In order to test the working stability and the consistency of luminescence for the LEDs, this device could monitor and measure the luminous status of multiple LEDs automatically at the same time. Using this device, 72 white LEDs which were randomly selected were tested. According to the analysis and calculation of the experimental data, the result shows that the change of the relative intensity is about 1.5% after those white LEDs are lighting for 900 h. Finally, 10 desirable LEDs are screened depending on the requirements of the light source.