![]() Note that the areas near either end of the tube are not strong enough to support a radial load thus, radial loads should only be applied to the central area of the curved surface, at least 1 mm away from the edges. A preload can be applied in either of these orientations, but loads should not be mounted to both simultaneously. The piezo tube exhibits a displacement in both the axial and radial directions. We recommend using a resistor (>1 kΩ) between the electrodes to release the charge. Directly connecting the positive and negative electrodes has the risk of electricity discharging, spark, and even failure. For piezos with pre-attached wires, the red wire is attached to the inner, positive electrode, and the black wire is attached to the outer, negative electrode (ground).Ĭaution: After driving, the piezo is fully charged. Applying a negative bias across the device may cause mechanical failure. The inner surface is the positive electrode that should receive positive bias, and the outer surface should be connected to ground. Align the Individual PZT or BSPT Crystals Along the Same Axis by Poling the ElementsĪ positive bias should be applied across the device.Screen Print the Outer Electrodes on the Elements.Lap the Elements to Achieve Tight Dimensional Tolerances: ±5 µm for Each Element.Sinter the Elements to Fuse the Piezoelectric Pressed Powder and Grow PZT or BSPT Crystals.Purge Solvent and Binder Material Residues by Heat Treating the Elements.Dice the Block into Individual Elements.Consolidate the Layered Sheets in an Isostatic Press.Layer the Printed Sheets One Top of Another.Screen Print Electrodes on Each Individual Sheet.Build Blocks from Flexible Sheets of Lead Zirconate Titanate (PZT) or BiScO 3-PbTiO 3 (BSPT) Powder.For more information about our manufacturing process and capabilities, please see our Piezoelectric Capabilities page. A glimpse into the fabrication of our piezoelectric chips follows. This allows us to economically produce high-quality products, including custom and OEM devices. Our piezoelectric chips are fabricated in our production facility in China, giving us full control over each step of the manufacturing process. For this reason, we do not specify a load for maximum displacement as with other piezo designs.Ĭhips After Binder Burnout and Sintering Thorlabs' In-House Piezoelectric Manufacturing See the Operation tab for more information on using these piezoelectric actuators.īecause these piezo elements contract with an applied voltage, applying a pushing load to the piezo enhances the stroke however, the load negatively influences the recovery. For axial loads, try to obtain as large an area of contact as possible on the top and bottom edges of the tube without interfering with the attached wires. Attaching a radial load to the edges may lead to mechanical failure. In addition, a radial load should only be attached to the central area of the outer surface, at least 1 mm away from the edges. The radial load should be less than 20 N exceeding 20 N may cause mechanical failure. Do not use with loads mounted to both areas. When using these piezos, the load should be mounted on either the curved surface (for radial displacement) or the top and bottom rims (for axial displacement). In the case of the wired actuators, the wire soldered to the positive electrode is red. The inner surface is the positive electrode that should receive positive bias. The actuators contract in both the radial and axial directions when a positive voltage is applied to the electrodes. The piezo tubes provide a maximum displacement of 2.8 µm along the axis of the cylinder and 1.8 µm in the radial direction. They have an outer diameter of 8.0 mm and an inner diameter of 7.0 mm. These piezoelectric chips consist of a thin ceramic sheet in a cylindrical shape. Custom Options Available by Contacting Tech Support.Actuators with Bare Electrodes or Pre-Attached Wires.Displacement in Axial and Radial Directions.The inner surface of the piezo tube is the positive electrode and should receive a positive voltage.
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