摘要:
A steering system for a subterranean penetrator includes a fixed fin and a rotatable fin. The fixed fin is advantageously attached to the exterior rear portion of the penetrator at an angle of approximately 25* with the penetrator''s longitudinal axis. The rotatable fin is located diametrically opposite to the fixed fin, the axis of rotation thereof being perpendicular to and intersecting the penetrator''s longitudinal axis. An associated actuating mechanism located within the penetrator adjustably orients the position of the rotatable fin. Rotation of the penetrator about its longitudinal axis is effected when the rotatable fin is antiparallel to the fixed fin or to a lesser degree when the rotatable fin is substantially parallel to the penetrator''s long axis. Curvilinear penetrator motion along the desired steering plane is effected when the rotatable fin is parallel to the fixed fin, the axis of rotation of the rotatable fin being perpendicular to this plane. In one embodiment of this invention, the rear portion of the penetrator which houses the fins is inwardly tapered at approximately 4* to allow use of substantially smaller fins and/or produce higher steering rates for a given length penetrator. It is an advantage of this invention that it does not require the articulatable tail and its associated actuating mechanism of prior art subterranean penetrators.
摘要:
A system for monitoring telephone cable insulation and jacket wall thickness and centering during manufacture consists of four capacitive probe segments spaced at 90* intervals with a dielectric gap separating adjacent segments. The probe is flanked by guard tubes which along with each segment are connected to a switch capable of placing any or all segments at guard potential. In various configurations ordered by the switch, capacitance measurements are made to yield indicia of coaxial capacitance, eccentricity and ovality.