TEST FREQUENCIES SELECTION CRITERIA FOR PARAMETER IDENTIFICATION OF ANTICORROSION COATING USING BILINEAR TRANSFORMATION |
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| Marek Niedostatkiewicz, Grzegorz Lentka |
- Abstract:
- The electrical modelling of technical and biological objects has become very popular, as it allows diagnosis of their state with tools and methods designed for electrical circuits. To identify equivalent circuit parameters, usually conventional impedance spectroscopy methods are used, despite their drawbacks – long measurement time and high numerical complexity. An alternative identification method is based on the bilinear transformation of impedance function. Not only it accelerates the measurement, but also it simplifies the calculations, as the relations between measured impedance and parameters are analytical. However, the method requires a precise selection of impedance measurement frequencies. In the paper, we briefly present the bilinear identification method and compare some new frequencies selection criteria based on the length of bilinear transform identification curve on complex plane, representing the high-signal sensitivity of impedance function to model parameters. The criteria are compared in terms of identification error of parameters. As a test object the Beaunier’s model of the anticorrosion coating in its early stage of degradation has been chosen.
- Download:
- IMEKO-TC4-2008-202.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
- Title:
- XVIth IMEKO TC4 International Symposium on Electrical Measurements and Instrumentation (together with 13th IMEKO TC4 Workshop on ADC Modelling and Testing)
- Place:
- Florence, ITALY
- Time:
- 22 September 2008 - 24 September 2008