Tubular scanners allow you to get quite large movements
Objects with relatively small control voltages. Tubular
piezoelements are hollow thin-walled cylinders made
from piezoceramic materials. Usually electrodes in the form of thin metal layers
are applied to the outer and inner surfaces of the tube, and the ends of the tube remain
uncovered.
Tubular scanners operate by bending a hollow piezoelectric tube in the lateral plane and elongation or compression of the tube along the Z axis. Electrodes controlling the movements of the tube end in the X and Y directions, are arranged in the form of four segments along the outer surface of the tube (Figure 1-4 b). When antiphase stresses are applied to opposite the electrodes of the outer surface of the tube (relatively inner) reduction of the tube section in the place where the field direction coincides with direction of polarization, and elongation at the point where they are directed to + X Z + Y -Y -X R sample z-piezoelectric element x-piezoelectric element y-piezoelement rigid frame Laboratory work № 1 1-9 opposite sides. This leads to the bending of the tube in the corresponding direction. The same principle is used to specify the movement in direction Y. The displacements in the X and Y directions are proportional to the applied voltage and the square of the length of the tube. Supply voltage to the internal electrode tube leads to the elongation of the entire tube in the Z direction in proportion to its length and applied voltage.
Tubular scanners operate by bending a hollow piezoelectric tube in the lateral plane and elongation or compression of the tube along the Z axis. Electrodes controlling the movements of the tube end in the X and Y directions, are arranged in the form of four segments along the outer surface of the tube (Figure 1-4 b). When antiphase stresses are applied to opposite the electrodes of the outer surface of the tube (relatively inner) reduction of the tube section in the place where the field direction coincides with direction of polarization, and elongation at the point where they are directed to + X Z + Y -Y -X R sample z-piezoelectric element x-piezoelectric element y-piezoelement rigid frame Laboratory work № 1 1-9 opposite sides. This leads to the bending of the tube in the corresponding direction. The same principle is used to specify the movement in direction Y. The displacements in the X and Y directions are proportional to the applied voltage and the square of the length of the tube. Supply voltage to the internal electrode tube leads to the elongation of the entire tube in the Z direction in proportion to its length and applied voltage.