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The influence of temperature is a major problem in Structural HealthMonitoring diagnosis using guided waves. In this article, two methods fortemperature compensation are used to evaluate the temperature of a structuremonitored by Piezoceramic Transducers (PZT). The first one consists in a linearregression of the static capacity of the PZT (computed with theelectromechanical impedance) with the temperature. It allows one to determinetemperature of a PZT from any impedance measurement. The second method is basedon the Modes Frequency Shift (MFS) of the frequency response function (FRF)calculated in a pitch-catch mode with an exponential sweep signal. A linearregression between the MFS and the temperature is settled for most modes andallow the estimation of temperature between two PZT. Experiments on a compositeplate monitored by 5 PZT patches showed that a $\pm$2{\textdegree}C degreevariation can easily be identified with both methods. Combined together, thosetwo methods could replace actual temperature sensors and bring an efficientimprovement for temperature compensation in applications where the temperaturevariation is heterogeneous on a structure.

Combination of frequency shift and impedance-based method for robust temperature sensing using piezoceramic devices for shm