Patent ID: 8692541
Filing Date: 2014-04-08
Classification: G01D

Abstract:
1. A sensing head for measuring a position and producing an output, the output indicative of the measured position, the sensing head comprising: a sensing element connected with an electronic circuit, the sensing element having a length, at least one resonator disposed along at least a part of the sensing element length, the resonator having a resonant frequency, the resonant frequency having a value, the resonator being formed of a conductor pattern having a pitch and a spacing, the pitch and spacing at least partially controlling the value of the resonant frequency, the electronic circuit comprising at least an oscillator and a buffer, wherein the resonator is an integral part of the oscillator, the sensing element coupled to the oscillator, the oscillator coupled to the buffer, an electrodynamic target being made of an electrically conductive material, the target movable along a motion axis that is approximately parallel with or perpendicular to the sensing element length, relative alignment between the target and the sensing element affecting the resonant frequency, the output having an output frequency, the output frequency having a value, the value of the output frequency being substantially the same as the value of the resonant frequency, the sensing head receiving power from a power source, the power being received from the power source over one wire and one power return conductive path, at least one output frequency being measurable on the one wire.