Method for determining a turbidity and turbidity sensor for implementing the method

US9671339B2 · kind B2 · utility

Assignee

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

Inventors

• Björn Haase · Stuttgart, DE
• Matthias Grossmann · Lambach, DE
• Carsten Gotz · Ettenheim, DE
• Thilo Krätschmer · Gerlingen, DE

Key dates

• Filing date: Dec 3, 2015
• Grant date: Jun 6, 2017
• Expiry date: Dec 3, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2021/473
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining a turbidity of a medium in a container using at least one turbidity sensor. Depending on the ambient conditions at the installation location of the turbidity sensor, comprising the following steps: passing transmitted radiation through the medium, wherein the transmitted radiation is converted by interaction with the medium, as a function of the turbidity in the received radiation; receiving the received radiation; converting the received radiation into a scattered light intensity, and determining the turbidity from the scattered light intensity. The method is characterized by the following steps: detecting the chronological sequence of the scattered light intensity; determining a mean value on the basis of the chronological sequence of the scattered light intensity; determining the turbidity from the mean value using a calibration model by assigning a turbidity to each mean value; determining a corrected mean value on the basis of the chronological sequence of the scattered light intensity, by determining a noise parameter from the scattered light intensity, and by determining the corrected mean value from the noise parameter using a noise model, and deter…