Single coil position and movement sensor having enhanced dynamic range

摘要

A control circuit electrically coupled to the conductive coil of the elongated probe includes an energization circuit for coupling an alternating current signal to the coil. A monitoring circuit monitors a signal from the coil as the alternating current signal is applied to the coil that changes with a degree of overlap between the coupling member and the elongated probe and for providing an output signal related to the relative positions of two moveable members. A feedback control circuit adjusts the alternating current signal coupled to the coil to a control level based on the monitored signal from the monitoring circuit. Use of the feedback control enhances a dynamic range of the output signal from the monitoring circuit.