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Showing 1 to 10 of 10 for “"Piezo actuator"”.
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Cantilever Dynamic Analysis in Tapping Mode Atomic Force Microscopy
… of 170 GPa and a Poisson’s ratio of 0.28. A piezo actuator is attached to the cantilever. A sinusoidal voltage is subsequently applied to the piezo actuator in order to vibrate the cantilever. The cantilever’s dynamic displacement responses are firstly obtained via simulation under different …
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Piezoelectric buckling actuators : form reduction, bidirectional control, and optimal switching
Piezoelectric stack actuators are generally described as having large force density, high bandwidth response, and limited yet precise displacement properties. As a result, these actuators have been widely applied to precision positioning devices, acoustical and optical instruments, and within …
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In-situ depth monitoring for a deep reactive ion etcher using a white light interferometer with active vibration cancellation
… the position of the reference mirror using a piezo actuator. This scheme ties the accuracy of the white light depth scan to the stability of the laser wavelength, allowing for accurate step sizes without the need for an expensive scanning stage. The well defined sampling period allows for the …
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The effects of operating conditions on the hydrodynamic lubricant film thickness at the piston-ring / cylinder liner interface of a firing diesel engine
… a manufacturer calibrated closed loop controlled piezo-actuator to present a target relative to the sensor face. Some previous investigations concluded a stable oil film thickness. However, this work shows that there are cyclic variations of the oil film thickness OFT on a stroke to stroke and …
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Nanoscale infrared absorption imaging and tomography
… reference expansion generated by a mechanical actuator (piezo) placed under the sample. Dividing the raw AFM-IR contrast by this reference signal at each sample position eliminates spatial responsivity variations enabling accurate chemical imaging. Although the ratio approach corrects for …
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High temperature ultrasonic gas flow sensor based on lead free piezoelectric material
… over alternatives. Weakness of current piezoelectric based transducers are identified as the inability to operate at temperatures above 400 °C due to limitation of piezoelectric materials used, and a case for development of an alternative high temperature material is put forward. A novel …
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Vibration assisted machining: Modelling, simulation, optimization, control and applications
… out for both the machine structure and the piezo-actuator device. The instrumentation implementation mainly includes the design of the desktop vibration assisted machining system and its control system. The machining system consists of a piezo-driven XY stage, air bearing spindle, jig, …
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Improved Organic Semiconductor Thin-Film Formation through the Addition of Vibrations to the Solution Shearing Method
… coating process. The new coating method, named “piezoshearing”, allows the application of vibrations to the liquid during deposition through the attachment of a piezo actuator to the shearing blade. The piezoshearing is implemented to enhance crystal growth during the solution shearing of …
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Design and Fabrication of Optomechanical Formalin Fixation Monitoring Systems Integrated with a Millifluidic Device
… the SW-LSI system consisting of a 532nm laser, a piezo-actuator and a camera was constructed for this study. The stiffness changes of phantoms and chicken breast tissues during formalin fixation are investigated for different sizes of the samples. We present the distinct temporal change of the …
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Design and control of high-speed and large-range atomic force microscope
… of a parameter estimation methodology for piezo actuator hysteresis modeling and compensation. Atomic force microscopes can provide nano-scale resolution images of sample surface topography in air, vacuum or in liquid. This instrument operates by scanning a micro-mechanical probe on a …