Method for determining a switching status of an impedance sensor and impedance sensor

US10890547B2 · kind B2 · utility

Assignee

• VEGA Grieshaber KG · DE

Inventors

• Volker Allgaier · Lenzkirch, DE
• Dominik Fehrenbach · Rottweil, DE

Key dates

• Filing date: Jul 23, 2019
• Grant date: Jan 12, 2021
• Expiry date: Jul 23, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/266
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining a switching status of an impedance sensor comprising a measuring probe, which can be influenced in its capacity by a medium surrounding the measuring probe, a measuring oscillator circuit in which the measuring probe is arranged as a capacity-determining element, an electronic unit with a signal generator to excite the measuring oscillator circuit, and a signal detector to determine a response signal of the measuring oscillator circuit, and an evaluation and control unit which is connected to the electronic unit, with the signal generator being addressed with an input signal, the response signal of the measuring oscillator circuit being determined, a switching status being issued based on the output value, and a plurality of amplitude minima of the frequency response being determined, whereby in the event that precisely one minimum is determined, here the minimum being issued as the output value.