Characterisation of the polarisation state of embedded piezoelectric transducers by thermal waves and thermal pulses

Abstract

Abstract. In this work, we apply the thermal wave method and the thermal pulse method for non-destructive characterisation of the polarisation state of embedded piezoelectric transducers. Heating the sample with a square-wave modulated laser beam or a single laser pulse leads to a pyroelectric current recorded in the frequency or time domain, respectively. It carries information about the polarisation state. Analytical and numerical finite element models describe the pyroelectric response of the piezoceramic. Modelling and experimental results are compared for a simple lead-zirconate-titanate (PZT) plate, a low-temperature co-fired ceramics (LTCC)/PZT sensor and actuator, and a macro-fibre composite (MFC) actuator.

C8.3 - Thermal wave and thermal pulse studies of the impact of manufacturing technology on the polarization of piezofiber composites

“…In the case of the thermal pulse method, the pyroelectric response can be described in the time domain with eq. (2) if the temperature distribution (z, t) in the piezoelectric material is known [10,11] or it can be converted to the frequency domain by a Fourier transform. The obtained frequency spectra are corrected by the transfer function of the measurement set-up to account for the influence of the amplifier settings.…”