Measuring device for determining a change in path and / or angle between the measuring device and an opposing position element and measuring method

Abstract

Measuring device (100) for determining a change in path and / or angle between the measuring device (100) and an opposing position element (700), wherein the position element (700) and the measuring device (100) are arranged to be movable relative to each other, the measuring device (100) comprising: a first electrical resonant circuit (200) with a coil (210) and a capacitor, a second electrical resonant circuit (300) with a spirally wound reference coil (310, 320), wherein the reference coil (310, 320) is arranged adjacent to the coil (210), a first excitation circuit (400) which is connected to the first electrical resonant circuit (200) in order to excite the electrical resonant circuit (200) with an electrical fundamental oscillation, a second excitation circuit (402) which is connected to the second electrical resonant circuit (300) in order to excite the electrical resonant circuit (300) with a second electrical fundamental oscillation, a first measuring circuit (500) connected to the first electrical resonant circuit (200) for determining a first resonant frequency f R of the first electrical resonant circuit (200), wherein the coil (210) is wound in a spiral shape and the coil (210) has a plurality of turns (W1, W2, ..., WN), wherein the centers of gravity (S1, S2, ..., SN) of the turns (W1, W2, ..., WN) are arranged offset, so that the coil (210) forms a measuring instrument, wherein the first measuring circuit (500) is a frequency meter for determining the first resonant frequency f R of the first electrical resonant circuit (200), and a second measuring circuit (502) which is connected to the second electrical resonant circuit (300) for determining a second resonant frequency f R of the second electrical resonant circuit (300).

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