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2014 | OriginalPaper | Buchkapitel

Characterisation of Pyroelectric Materials

verfasst von : Roger Whatmore

Erschienen in: Characterisation of Ferroelectric Bulk Materials and Thin Films

Verlag: Springer Netherlands

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Abstract

Pyroelectrics form a very broad class of materials. Any material which has a crystal structure possessing a polar point symmetry—i.e. one which both lacks a centre of symmetry and has a unique axis of symmetry—will possess an intrinsic, or spontaneous, polarisation and show the pyroelectric effect. The pyroelectric effect is a change in that spontaneous polarisation caused by a change in temperature. It is manifested as the appearance of free charge at the surfaces of the material, or a flow of current in an external circuit connected to it. The effect is a simple one, but it has been used in a range of sensing devices, most notably uncooled pyroelectric infra-red (PIR) sensors, and has thus come to be of some engineering and economic significance, enabling a wide range of sensing systems, ranging from burglar alarms through FTIR spectroscopic instruments to thermal imagers.

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Vorheriges Kapitel Direct Piezoelectric Measurement: The Berlincourt Method

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Titel: Characterisation of Pyroelectric Materials
verfasst von: Roger Whatmore
Verlag: Springer Netherlands
Buch: Characterisation of Ferroelectric Bulk Materials and Thin Films
Print ISBN: 978-1-4020-9310-4

Electronic ISBN: 978-1-4020-9311-1

Copyright-Jahr: 2014
DOI: https://doi.org/10.1007/978-1-4020-9311-1_4

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