Device and a process for determining the positions of border areas between different mediums

US6701783B2 · kind B2 · utility

Assignee

• VEGA Grieshaber KG · DE

Inventors

• Josef Fehrenbach · Lenzkirch, DE
• Karl Griessbaum · Nettetal, DE

Key dates

• Filing date: Sep 10, 2001
• Grant date: Mar 9, 2004
• Expiry date: Sep 10, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/284
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A process for determining the position of the border areas between different mediums with the aid of electromagnetic waves, in which process a departing wave which is emitted from a wave transmitter has at least one propagation speed component that is parallel to the normal lines of the border area of the different mediums; the emitted departing wave is at least partially reflected at the border areas; the portions of the reflected returning wave are received by a wave receiver; the travel times between emission of the departing wave and reception of the returning wave are determined; the positions of the border areas are determined from the travel times, with account taken of the different propagation speeds of the wave in the different mediums, while the various portions of the reflected waves in the different mediums (4, 5) are made use of. It is important to take into account here the quadratic relationship of &egr;r to the reflection factor r.