An icaroscope is a telescope-like nonlinear optical device that enables viewing of both very bright and dark objects in the same image simultaneously.
[2] The specific silver-activated zinc-cadmium sulphide phosphor has a short afterglow even in areas saturated by the full brightness of the sun.
The icaroscope repeats this process at a rate of 90 Hz, permitting continuous observation.
[2] Development of the icaroscope was carried out during the Second World War at the Institute of Optics by Brian O'Brien, Franz Urbach, and other researchers.
[1] The device is named for Icarus, the mythological figure known for flying too close to the sun.