Measurement of Temperature Dependence in the Piezoelectric Active Element of a Knock Sensor

conference paper

English

The article describes experimental research on PZT ceramics used in knock sensors. The aim of the paper is to investigate the temperature effects related to the parameters of piezoelectric materials and to characterize the influence and changes exerted by these parameters on the properties of knock sensors. The material properties of such elements based on PZT ceramics are significantly affected by temperature changes; we therefore examined the temperature effect during the heating phase and analysed the subsequent permanent changes to the piezoelectric coefficients. In the experiment, emphasis was placed on investigating the piezoelectric coefficient changes up to the limit value (i.e., the Curie temperature): we determined the Curie temperature of the piezoelectric material used in the knock sensor, measured the impedance and phase characteristics at the given thermal value, and cooled the material down to the ambient temperature. Subsequently, the piezoelectric constants were calculated from these characteristics, and the related influence was evaluated. The experiments demonstrated that temperature can affect the piezoelectric coefficients and thereby also to accuracy of a knock sensor or piezoelectric sensors generally.

knock sensor; ring; Sonox P502; temperature measurement; impedance analyzer

KLUSÁČEK, S.; FIALKA, J.; BENEŠ, P.; HAVRÁNEK, Z.; PIKULA, S.

2014

16. 11. 2014

The Australian Acoustical Society

Melbourne, Victoria, Austrálie

978-0-909882-04-4

Proceedings of 43rd International Congress on Noise Control Engineering

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