Sensing mechanism for linear servo accelerometer

Claim 1

In a sensing mechanism for a linear servo accelerometer, an outer case having a generally cylindrical recess therein, magnetic means mounted in the recess in the case and including a generally cylindrical pole piece centrally disposed in the recess to form a generally circular air gap with the case across which magnetic lines of flux pass, a circular restoring coil, a generally planar rigid member secured to the restoring coil, means including pivot and jewel assemblies carried by the case and engaging the rigid member for mounting the rigid member for pivotal movement about a pivot axis and serving to position said restoring coil in said air gap so that the restoring coil is symmetrical to the case and magnetic means, said restoring coil, said rigid member and said means for mounting the rigid member lying in the same General plane, said rigid member being mounted in relatively close proximity to said restoring coil and having its major dimension extending in a direction which is substantially parallel to the axis of pivotal movement of the restoring coil, a movable element in the form of a plate of conducting non-magnetic material carried by the restoring coil and being disposed on the same side of the pivot axis as the restoring coil, and pick-off means symmetrically disposed in the vicinity of the movable element to sense the position of the movable element.