Patent ID: 9625575
Date: 2017-04-18
CPC Classifications: F15B,G01D,G01S

Claim:
1. A distance measuring apparatus for determining a distance between a body in a conducting structure and an injection location at which electromagnetic waves are injected into the conducting structure, the distance measuring apparatus comprising: a signal source for generating the electromagnetic waves; a conduction cross-over at the injection location for coaxially-inductive coupling the signal source the conducting structure in order to inject an electromagnetic wave into the conducting structure and to decouple and receive the electromagnetic wave reflected from the body, orthogonally polarized electromagnetic waves being received simultaneously; and a device configured to calculate a distance between the injection point and the body from the phase difference between the injected electromagnetic wave and the decoupled electromagnetic wave, wherein the conduction cross-over comprises one or more conductive, inductive mode transformers that are configured to inject the electromagnetic wave, and the signal source generates the electromagnetic waves by in phase injection of a coaxial wave into the conducting structure by the one or more conductive, inductive mode transformers.