A triaxial epoxy cap probe may comprise a probe body having a cavity disposed radially outward of a fan blade and comprising a first material, an outer insulator and an inner insulator disposed within the cavity and comprising a second material, a sensor element disposed within the inner insulator, a guard annulus about the sensor element and between the inner insulator and the outer insulator, a ground plane annulus about the outer insulator, wherein the sensor element, the guard annulus, and the ground plane annulus comprise a third material, and a triaxial lead in electronic communication with the sensor element, the guard annulus, and the ground plane annulus, wherein the second material and the third material are at least one of a resin, epoxy, or thermoset material.
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