 The paper describes the fabrication and testing of thick film zinc oxide sensors that could be used to monitor the atomic oxygen fluence experienced by spacecraft in low Earth orbit, or that produced in ground-based atomic oxygen sources. Impedance spectroscopy measurements were carried out on the sensors to determine the conduction mechanisms within the thick films when exposed to atomic oxygen. The results indicate that the sensors' total resistance increases linearly with time when they

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... exposed to a constant flux of atomic oxygen, and that the sensors can be regenerated by heating. Index Terms-Atomic Oxygen, Space Environment, Thick film sensors, Zinc Oxide. J.C. Valer was a doctoral student at the University of Southampton. His contact details are:1 Rowleys Mill,