Dynamic analysis of a new piezoelectric flextensional actuator using the J1-J4 optical interferometric method
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Data
2005-12-01
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Resumo
Piezoelectric actuators are widely used in positioning systems which demand high resolution such as scanning microscopy, fast mirror scanners, vibration cancellation, cell manipulation, etc. In this work a piezoelectric flextensional actuator (PFA), designed with the topology optimization method, is experimentally characterized by the measurement of its nanometric displacements using a Michelson interferometer. Because this detection process is non-linear, adequate techniques must be applied to obtain a linear relationship between an output electrical signal and the induced optical phase shift. Ideally, the bias phase shift in the interferometer should remain constant, but in practice it suffers from fading. The J1-J4 spectral analysis method provides a linear and direct measurement of dynamic phase shift in a no-feedback and no-phase bias optical homodyne interferometer. PFA application such as micromanipulation in biotechnology demands fast and precise movements. So, in order to operate with arbitrary control signals the PFA must have frequency bandwidth of several kHz. However as the natural frequencies of the PFA are low, unwanted dynamics of the structure are often a problem, especially for scanning motion, but also if trajectories have to be followed with high velocities, because of the tracking error phenomenon. So the PFA must be designed in such a manner that the first mechanical resonance occurs far beyond this band. Thus it is important to know all the PFA resonance frequencies. In this work the linearity and frequency response of the PFA are evaluated up to 50 kHz using optical interferometry and the J1-J4 method.
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Cell manipulation , Control signal , Detection process , Direct measurement , Dynamic phase , Electrical signal , Flextensional actuator , Frequency band width , High resolution , High velocity , Homodyne interferometers , Linear relationships , Mechanical resonance , Micro manipulation , Mirror scanner , Nanometric displacements , Optical interferometric method , Optical interferometry , Optical phase shifts , Positioning system , Resonance frequencies , Scanning microscopy , Spectral analysis method , Topology Optimization Method , Tracking errors , Vibration cancellation , Feedback , Frequency response , Interferometry , Michelson interferometers , Molecular biology , Natural frequencies , Phase shift , Phase shifters , Piezoelectricity , Spectrum analysis , Piezoelectric actuators
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Inglês
Como citar
International Congress on Noise Control Engineering 2005, INTERNOISE 2005, v. 3, p. 1993-2002.