Stevenson, T*; Quast, T*; Bartl, G*; Schmitz-Kempen, T;; Weaver, P M (2015) Surface mapping of field induced piezoelectric strain at elevated temperature employing full-field interferometry. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 62 (1). pp. 88-96.

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Abstract

Piezoelectric actuators and sensors are widely used for flow control valves, including diesel injectors, ultrasound generation, optical positioning, printing, pumps and locks. Degradation and failure of material and electrical properties at high temperature typically limits these applications to operating temperatures below 200 °C, based on the ubiquitous Pb(Zr,Ti)O3 ceramic. There are however, many applications in sectors such as automotive, aerospace, energy and process control, oil and gas, where the ability to operate at higher temperatures would open up new markets for piezoelectric actuation.
Presented here is a review of recent progress and initial results toward a European effort to develop measurement techniques to characterise high temperature materials. Full field, multi-wavelength absolute length interferometry has, for the first time, been used to map the electric field induced piezoelectric strain across the surface of a PZT ceramic, and its variation as a function of temperature recorded and evaluated against newly developed industrial systems, that aim to allow materials measurements up to 1000 °C. Conventional interferometry itself allows measurement of the converse piezoelectric effect with high precision and resolution, but is often limited to a single point, average, measurement and with limited sample environments due to optical aberrations in varying atmospheres. Here the full field technique allows the entire surface to be analysed for strain and in a bespoke sample chamber for elevated temperatures.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Identification number/DOI:	10.1109/TUFFC.2014.006683
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6484

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