Picture of the experimental apparatus.
The proposed piezoelectric tube scanner. Tube dimensions are in millimeters. The tube is manufactured by Boston Piezo-Optics from PZT-5A piezoelectric ceramic material. The outer electrode of the tube is segmented into 12 equal sections.
The tube is divided into four 90 quadrants. Each quadrant consists of three electrodes. Two sets of experiments were performed on the tube. (a) The tube was wired up as a regular quartered electrode scanner. A voltage was applied to the three electrodes in one quadrant and the strain-induced voltage was measured at the opposite quadrant electrodes. Displacement was also measured at the tip of the tube using a laser vibrometer. (b) A voltage was applied to the two outer electrodes of a quadrant and an equal but opposite voltage was applied to the opposite electrodes. The piezoelectric strain voltage induced at one of the midle electrodes was inverted and added to the voltage measured at the opposite electrode, resulting in the measurement signal . Displacement was measured at the tip of the tube.
Frequency responses of the scanner, [(a) and (b)] when driven asymetrically; [(c) and (d)] under antisymetrtical actuation. (a) and (c) display the displacement response of the tube while (b) and (d) correspond to the voltage measured at the piezoelectric strain sensor.
Measured tip displacements, (-) and (--) in , and piezoelectric strain voltage, (-) and (--) in volts.
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