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Evaluation of polarization of embedded piezoelectrics by the thermal wave method

: Suchaneck, Gunnar; Eydam, Agnes; Hu, Wenguo; Kranz, Burkhard; Drossel, Welf-Guntram; Gerlach, Gerald


IEEE transactions on ultrasonics, ferroelectrics and frequency control 59 (2012), Nr.9, S.1950-1954
ISSN: 0885-3010
ISSN: 0018-9537
Fraunhofer IWU ()

This work demonstrates the benefit of the thermal wave method for the evaluation of the polarization state of embedded piezoelectrics. Two types of samples were investigated: A low-temperature co-fired ceramics (LTCC)/lead zirconate titanate (PZT) sensor-actuator and a macro-fiber composite (MFC) actuator. At modulation frequencies below 10 Hz, the pyroelectric response was governed by thermal losses to the embedding layers. Here, the sample behavior was described by a harmonically heated piezoelectric plate exhibiting heat losses to the environment characterized by a single thermal relaxation time.