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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), No.9, pp.1950-1954
ISSN: 0885-3010
ISSN: 0018-9537
Journal Article
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.