On-line Magazine 'Sensors & Transducers' (S&T e-Digest)
(ISSN 1726- 5479)
Vol. 39, Issue 1, January 2004, pp. 112-120
Ferroelectric Ceramic/Polymer Composite for Soil-Humidity Detection
Walter Katsumi SAKAMOTO, Josй Antonio MALMONGE,
Sérgio Henrique FERNANDES
Departamento de Física e Química, Faculdade de Engenharia,
Universidade Estadual Paulista – UNESP,
Av. Brasil, 56, 15385-000 Ilha Solteira (SP), Brasil.
Fax: +55 18 3742 4868, tel: +55 18 3743 1081
Received: 2 December 2003 /Accepted: 14 January 2004 /Published: 18 January 2004
Abstract: Ferroelectric ceramic + polymer composites using castor oil-based polyurethane (PU) as matrix and lead zirconate titanate (PZT) as dispersed powder were fabricated in the thin films form by spin-coating method. The composites were poled with appropriated electric field and its piezoelectric property was studied by conventional method. Using the ability of the composite to response with an electric signal to a variation of pressure, a detection system was made to substitute the manometer to measure the soil humidity.
Keywords: composite, soil humidity, pressure sensor, tensiometer
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