Nano Archive

Minimizing scanning errors in piezoelectric stack-actuated nanopositioning platforms

Aphale, Sumeet S. and Bhikkaji, Bharath and Moheimani, S. O. Reza (2008) Minimizing scanning errors in piezoelectric stack-actuated nanopositioning platforms. IEEE TRANSACTIONS ON NANOTECHNOLOGY, 7 (1). pp. 79-90.

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Piezoelectric stack-actuated parallel-kinematic nanopositioning platforms are widely used in nanopositioning applications. These platforms have a dominant first resonant mode at relatively low frequencies, typically in the hundreds of hertz. Furthermore, piezoelectric stacks used for actuation have inherent nonlinearities such as hysteresis and creep. These problems result in a typically low-grade positioning performance. Closed-loop control algorithms have shown the potential to eliminate these problems and achieve robust, repeatable nanopositioning. Using closed-loop noise profile as a performance criterion, three commonly used damping controllers, positive position feedback, polynomial-based pole placement, and resonant control are compared for their suitability in nanopositioning applications. The polynomial-based pole placement controller is chosen as the most suitable of the three. Consequently, the polynomial-based control design to damp the resonant mode of the platform is combined with an integrator to produce raster scans of large areas. A scanning resolution of approximately 8 nm, over a 100 mum times 100 mum area is achieved.

Item Type:Article
Uncontrolled Keywords:feedback control; nanopositioning; resonance damping; tracking
Subjects:Analytical Science > Microscopy and probe methods
Analytical Science > Nanotechnology for sensing and actuating
ID Code:5889
Deposited By:IoN
Deposited On:05 Aug 2009 10:45
Last Modified:05 Aug 2009 10:45

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