An equivalent circuit automatic fitting method for batch electrochemical impedance spectroscopy data

Abstract

The embodiment discloses an equivalent circuit automatic fitting method for batch electrochemical impedance spectroscopy data, obtains the measured values of various items of the alternating current impedance spectroscopy data in the test data by performing electrochemical impedance spectroscopy test on a cement-based test piece, obtains the element parameter vector in the candidate equivalent circuit after local fine-tuning by combining a composite optimization objective function, finds the optimal candidate equivalent circuit after traversing all the candidate equivalent circuits, and further obtains the final expression of the optimal candidate equivalent circuit based on the test data, and completes the fitting of the equivalent circuit for the batch electrochemical impedance spectroscopy data. The application can guarantee the fitting accuracy, improve the global reliability of the equivalent circuit parameter inversion and the batch processing capability, and better support the engineering application of the electrochemical impedance spectroscopy technology in the performance evaluation and durability analysis of cement-based materials.

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