From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
The Extremely Low-Resource Optical Identifier (ELROI) beacon is a concept for a milliwatt optical "license plate" that can provide unique ID numbers for everything that goes into space. Using photon counting to enable extreme background rejection in real time, the ID number can be uniquely identified from the ground in a few minutes, even if the ground station detects only a few photons per second. The ELROI concept has been validated in long-range ground tests, and orbital prototypes are scheduled for launch in 2018 and beyond. We discuss the design and signal characteristics of these prototypes, including a PC-104 form factor unit which was integrated into a CubeSat and is currently scheduled to launch in May 2018, and basic requirements on ground stations for observing them. We encourage others to consider observing our test flights.
Rebecca M. Holmes, Sawyer Gill, James Z. Harris, Joellen S. Lansford, Riley Myers, Charles T. Weaver, Aaron P. Zucherman, Anders M. Jorgensen, and David M. Palmer, "Progress on ELROI satellite license plate flight prototypes," Proc. SPIE 10659, Advanced Photon Counting Techniques XII, 106590M (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 19, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2306091.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon