US Patent 9702783 Air data probe with fluid intrusion sensor

An air data probe includes a stationary housing assembly, an air data measurement unit, and a fluid sensing unit disposed proximate to an interface between the housing assembly and the air data measurement unit. The air data measurement unit is rotatable about a longitudinal axis of the air data probe, relative to the stationary housing assembly. The fluid sensing unit includes a second electrically conductive sensing surface physically and dielectrically spaced from a first sensing surface.