Abstract
Conventional radiation choppers using rotating discs are potential sources of unreliability in space applications. This report examines a large number of possible alternative modulation techniques, treating several of them in detail. It is concluded that for horizon sensing purposes, using 14–16 μm CO 2 radiation, the most suitable alternative is a Fabry-Perot structure in which the plate separation is varied by means of piezo-electric ceramic transducers. Details of thermal compensation techniques are also given.
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