ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The displacement devices using piezoceramic sensors play an important role in manyfields. Soft type piezoelectric materials used for such sensors are more appealing because of theirlower coercive field, relatively low modulus of elasticity, high electromechanical coupling factorsand piezoelectric strain coefficients. We designed a PZT type material doped with niobium andnickel to increase the strain coefficient and still retaining a high coupling coefficient. The chemicalformula was Pb0.97Ba0.08Nb0.03Ni0.06Zr0.46Ti0.40O3. The main piezoelectric parameters were: d33=680pm/V, d31=-235 pm/V, kp=0.64 and k31=0.42. A unimorph transducer was made from a thin sheet ofsuch a piezoceramic material, tightly bonded on a thin optically polished glass plate and mounted asa cantilever. The performance of this transducer was evaluated by means of a new optical methodwhich makes use of the Moiré deflectometry and provides high precision. The method is rathersimply and consists mainly in the following: the Moiré fringes rotate when the bimorph bends underthe influence of the electric field and by measuring the rotating angle of the fringes one can easilydetermine the bimorph curvature and the free end displacement
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.253.pdf
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