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What is Passive System

Chapter 3
Handbook of Research on Advanced Intelligent Control Engineering and Automation
A multi-input multi-input transfer function matrix is said to be passive if the eigenvalues of the matrix are greater than or equal to zero for all .
Published in Chapter:
Advanced Vibration Control of Atomic Force Microscope Scanner
Sajal K. Das (University of New South Wales, Australia), Hemanshu R. Pota (University of New South Wales, Australia), and Ian R. Petersen (University of New South Wales, Australia)
Copyright: © 2015 |Pages: 23
DOI: 10.4018/978-1-4666-7248-2.ch003
Abstract
Atomic Force Microscopes (AFMs) are used in many nanopositioning applications in order to measure the topography of various specimens at an atomic level through surface imaging. The imaging of the samples in AFMs is carried out by using a three degree-of-freedom positioning unit called Piezoelectric Tube Scanner (PTS). The performance of the AFM mostly depends on the performance of the PTS. However, the PTS of the AFM suffers from the problem of vibration. This chapter presents a design of a damping controller to compensate the induced vibration of the scanner. Experimental results are presented to show the effectiveness of the proposed controller. The experimental results show that the proposed controller is able to compensate 90% of the vibration of the PTS.
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