Method for measuring oxygen and apparatus for measuring oxygen

US11525781B2 · kind B2 · utility

Assignee

• Endress+Hauser Conducta GmbH+Co. KG · DE

Inventors

• Hendrik Zeun · Chemnitz, DE
• Ronny Michael · Erlau, DE

Key dates

• Filing date: Nov 30, 2020
• Grant date: Dec 13, 2022
• Expiry date: Jun 16, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/1211
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A measuring method for measuring dissolved oxygen includes performing a first measurement sequence, including: emitting a first stimulation signal onto a sensor for a first period; detecting a first detection signal; determining a phase shift between the first stimulation signal and the first detection signal; and calculating a first measured value based on the determined phase shift. Performing a second measurement sequence, including a second stimulation signal onto the sensor for a second period, wherein the second stimulation signal is different than the first stimulation signal; detecting a second detection signal; determining a decay time of the second detection signal; calculating a second measured value based on the decay time. The method further includes comparing the first measured value to the second measured value and correcting the first measured value when a difference between the first measured value and the second measured value is greater than a first limit value.