Patent ID: 7911354

Claim:
A position sensor comprising: a circular transmitter coil which generates electromagnetic radiation when excited by a source of electrical energy, a receiver coil having a first loop wound in a first direction around a first portion of said transmitter coil, a second loop wound in a second direction opposite from said first direction around a second diametrically opposed portion of said transmitter coil, a first compensating coil wound in said second direction inside said first portion of said transmitter coil and a second compensating coil wound in said first direction inside said second portion of said transmitter coil, said first loop, said second loop, said first compensating coil and said second compensating coil being connected in series, said receiver coil generating an electrical output signal when said transmitter coil is excited due to inductive coupling between said transmitter coil and said receiver coil, and a movable coupler element which varies the inductive coupling between said transmitter coil and said receiver coil as a function of the position of said coupler element to thereby vary the electrical output signal from said receiver coil when excited by said transmitter coil.