1133 the piezoelectric effect source philips

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Unformatted text preview: 0 160 kA/m -10 3 -20 240 H 4 -30 5 -40 6 % Nickel, 94 % Iron (1) Iron (3) 29 % Nickel, 71 % Iron (2) Cobalt (annealed) (4) Nickel (5) Fig. 11.3.2: Magnetostrictive strain curves of various materials in relation to field strength H © Festo Didactic GmbH & Co. KG • FP 1110 179 11. Physical fundamentals Electrical generation With electrorestriction (inverse piezoelectrical effect) an alternating voltage of high frequency is connected to a crystal plate. This plate then carries out the mechanical oscillations of the corresponding frequency, which become particularly strong with resonance. Frequencies of up to approximately 10 000 kHz are achieved. 7 F F a) 1 2 3 b) 4 5 6 Unloaded body (1) Compressive stress (2) Tensile stress (3) DC voltage, opposed to polarisation (4) DC voltage, parallel to polarisation (5) AC voltage, leads to alternate lengthening and shortening (6) Polarisation axis (7) a) Conversion of force into voltage b) Conversion of voltage into linear change Fig. 11.3.3: The piezoelectric effect (source: Philips Components) Nowadays, instead of...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

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