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Andrew J. Fleming

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Contact Details:
Dr. Andrew J. Fleming
Centre for Complex Dynamic Systems and Control
School of Electrical Engineering and Computer Science
The University of Newcastle
Callaghan, NSW 2308, Australia
+61 2 4921 6493

Andrew(dot)Fleming(at)newcastle.edu.au




Recent Research Results / News:

Journal Paper in the Top 1% of Cited Papers in Engineering
The following research paper was recently listed by ISI as a highly cited paper in engineering.
Sensorless Vibration Suppression and Scan Compensation for Piezoelectric Tube Nanopositioners, A. J. fleming and S. O. R. Moheimani, IEEE Transactions on Control Systems Technology, Volume 14, Number 1, pages 33-44, January 2006
AFM Image of a 25nm height calibration grating
AFM Image of a 25nm height calibration grating		 IRC control of an AFM positioner
A control system for atomic force microscopes that eliminates scan induced vibration. The image on the left is distorted by scan-induced vibration. The image on the right uses an IRC controller.
The oscillation of a nanopositioner with different inputs
Nanopositioner with different inputs		 Input signals that don't produce oscillation in mechanical systems
This new method is ideal for generating input signals for nanopositioning scanners. The input signals contain very little harmonic content and do not excite mechanical resonance. 
50um scan of grating with 3um period and 20nm height
50um scan of grating with 3um period and 20nm height		 Linearization of nanopositioning stages by charge drive
By replacing voltage amplifiers that drive piezoelectric nanopositioning stages with charge drives, the accuracy can be increased by greater than 90%. The image on the left uses a voltage amplifier while the right hand image uses a charge drive.




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