用于空间多目标光谱仪的数字微镜器件的评价
Evaluation of Digital Micromirror Devices for use in space-based Multi-Object Spectrometer application
摘要：
天文学界继续对用于空间飞行任务的多目标光谱仪的合适的可编程狭缝掩模感兴趣。已经有利用数字式MEMS器件（DMD）的地面MOS，并且它们已被证明是高度精确和可靠的仪器。本文总结了一项持续研究的结果，以调查与空间部署相关的条件下的DMD的性能。这包括DMD对辐射、与发射相关的振动和机械冲击载荷的响应，以及DMD在低温下的可操作性。光学对比度和裸器件的长期反射率的研究也进行了研究。辐射测试结果表明，轨道上的DMD将经历可忽略不计的重离子引起的单粒子翻转（SEU）率负担，我们预测SEU率为5.6微镜每24小时。根据NASA通用环境验证标准（GEVS）进行了振动和机械冲击测试，受试器械中没有反射镜失效。低温测试的结果表明，DMD不受热负荷的影响，并且在至少低至78 K的温度下平稳地工作。裸DMD的反射率即使在暴露于环境条件下13个月后也没有明显变化。当用f/4光束照射时，测量的对比度（DMD微镜的开启状态与关闭状态）大于6000/：1。总的来说，DMD是非常强大的，并承诺提供一个可靠的替代微型快门阵列（MSA）在空间中使用的远程可编程狭缝掩模的MOS设计。
英文摘要：
The astronomical community continues to be interested in suitable programmable slit masks for use in multi-object spectrometers (MOSs) on space missions. There have been ground-based MOS utilizing digital micromirror devices (DMDs) and they have proven to be highly accurate and reliable instruments. This paper summarizes the results of a continuing study to investigate the performance of DMDs under conditions associated with space deployment. This includes the response of DMDs to radiation, to the vibration and mechanical shock loads associated with launch, and the operability of DMD under cryogenic temperatures. The optical contrast ratio and a study of the long-term reflectance of a bare device have also been investigated. The results of the radiation testing demonstrate that DMDs in orbit would experience negligible heavy-ion induced single event upset (SEU) rate burden, we predict SEU rate of 5.6 micromirrors per 24 hours. Vibration and mechanical shock testing was performed according to the NASA General Environmental Verification Standard (GEVS), no mirrors failed in the devices tested. The results of low temperature testing suggest that DMDs are not affected by the thermal load and operate smoothly at temperatures at least as low as 78 K. The reflectivity of a bare DMD did not measurably change even after being exposed to ambient conditions over a period of 13 months. The measured contrast ratio (on state vs off state of the DMD micromirrors) was greater than 6000/:1 when illuminated with an f/4 optical beam. Overall, DMDs are extremely robust and promise to provide a reliable alternative to micro shutter arrays (MSA) to be used in space as remotely programmable slit masks for MOS design.
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