Characterization and failure analysis of a sensor using impedance frequency response spectra

US11543382B2 · kind B2 · utility

Assignee

• Endress+Hauser Conducta, Inc. · US

Inventors

• Jinshan Huo · Corona, US
• Michael Hanko · Dresden, DE
• Hermann Günther · Dresden, DE
• Robert Tzschoppe · Großweitzschen, DE

Key dates

• Filing date: Mar 31, 2020
• Grant date: Jan 3, 2023
• Expiry date: Apr 16, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/22
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

According to at least one aspect of the present disclosure, a method includes applying an alternating current having a frequency at a selected voltage to a sensor, wherein the voltage is applied between a reference electrode and a working electrode of the sensor, varying the frequency of the alternating current between a lower frequency and an upper frequency, measuring an impedance of the sensor between the reference electrode and the working electrode as a function of the frequency of the alternating current, analyzing the measured impedance to determine a total impedance of the sensor and the real and imaginary components of the total impedance at each applied frequency of the alternating current, and characterizing the sensor based on the total impedance at the low frequency end of the sensor and on the real and imaginary components of the total impedances.