A Thick Film Capacitive Temperature Sensor Using Barium Strontium Titanate Glass Formulations | Zendy

S. Leppävuori | Zendy; T. Hannula | Zendy; A. Uusimäki | Zendy

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A Thick Film Capacitive Temperature Sensor Using Barium Strontium Titanate Glass Formulations

Author(s) -

S. Leppävuori,

T. Hannula,

A. Uusimäki

Publication year - 1979

Publication title -

active and passive electronic components

Language(s) - English

Resource type - Journals

eISSN - 1026-7034

pISSN - 0882-7516

DOI - 10.1155/apec.6.13

Subject(s) - frit , materials science , dielectric , capacitive sensing , atmospheric temperature range , capacitance , ceramic , ferroelectricity , curie temperature , thermistor , composite material , mineralogy , analytical chemistry (journal) , optoelectronics , electrode , electrical engineering , thermodynamics , condensed matter physics , chemistry , physics , ferromagnetism , engineering , chromatography

This paper describes a novel use of thick film techniques to produce a temperature sensor. Ferroelectric materials above their Curie temperature exhibit a dielectric constant which is inversely dependent upon temperature. The measuring range of the sensor can be altered by varying the ratio of the ferroelectric components used (BaTiO 3 and SrTiO 3 ). By using this ceramic together with a glass frit to form a paste, it is possible to employ standard thick film techniques to produce the sensors. Sensors with a composition (Ba 0.5 Sr 0.5 )TiO 3 were subjected to various temperature and ambient conditions to investigate their temperature performance and stability. The sensors were fundamentally stable and exhibited a capacitance change as large as 65% of their initial value over a temperature range of 100℃ and yet the dependence was linear to within 1.5℃.

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