Making a commercial atomic force microscope more accurate and faster using positive position feedback control

This paper presents experimental implementation of a positive position feedback (PPF) control scheme for vibration and cross-coupling compensation of a piezoelectric tube scanner in a commercial atomic force microscope (AFM). The AFM is a device capable of generating images with extremely high resol...

Full description

Bibliographic Details
Main Authors:	Mahmood, Iskandar Al-Thani, Moheimani, S.O. Reza
Format:	Article
Language:	English
Published:	American Institute of Physics (AIP) 2009
Subjects:	Q Science (General) TJ212 Control engineering
Online Access:	http://irep.iium.edu.my/5202/ http://irep.iium.edu.my/5202/ http://irep.iium.edu.my/5202/ http://irep.iium.edu.my/5202/1/Making_a_commercial_atomic_force_microscope_more_accurate_and_faster_using_positive_position_feedback_control.pdf

id	iium-5202
recordtype	eprints
spelling	iium-52022011-11-09T04:05:40Z http://irep.iium.edu.my/5202/ Making a commercial atomic force microscope more accurate and faster using positive position feedback control Mahmood, Iskandar Al-Thani Moheimani, S.O. Reza Q Science (General) TJ212 Control engineering This paper presents experimental implementation of a positive position feedback (PPF) control scheme for vibration and cross-coupling compensation of a piezoelectric tube scanner in a commercial atomic force microscope (AFM). The AFM is a device capable of generating images with extremely high resolutions down to the atomic level. It is also being used in applications that involve manipulation of matter at a nanoscale. Early AFMs were operated in open loop. Consequently, they were susceptible to piezoelectric creep, thermal drift, hysteresis nonlinearity, and scan-induced vibration. These effects tend to distort the generated image and slow down the scanning speed of the device. Recently, a new generation of AFMs has emerged that utilizes position sensors to measure displacements of the scanner in three dimensions. These AFMs are equipped with feedback control loops that work to minimize the adverse effects of hysteresis, piezoelectric creep, and thermal drift on the obtained image using proportional-plus-integral _PI_ controllers. These feedback controllers are often not designed to deal with the highly resonant nature of an AFM’s scanner nor with the cross coupling between various axes. In this paper we illustrate the improvement in accuracy and imaging speed that can be achieved by using a properly designed feedback controller such as a PPF controller. Such controllers can be incorporated into most modern AFMs with minimal effort since they can be implemented in software with the existing hardware. Experimental results show that by implementing the PPF control scheme, relatively good images in comparison with a well-tuned PI controller can still be obtained up to line scan of 60 Hz. American Institute of Physics (AIP) 2009-06 Article PeerReviewed application/pdf en http://irep.iium.edu.my/5202/1/Making_a_commercial_atomic_force_microscope_more_accurate_and_faster_using_positive_position_feedback_control.pdf Mahmood, Iskandar Al-Thani and Moheimani, S.O. Reza (2009) Making a commercial atomic force microscope more accurate and faster using positive position feedback control. Review of Scientific Instruments, 80 (6). 063705-1. ISSN 1089-7623 (O), 0034-6748 (P) http://rsi.aip.org/resource/1/rsinak/v80/i6/p063705_s1?isAuthorized=no http://link.aip.org/link/doi/10.1063/1.3155790
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	Q Science (General) TJ212 Control engineering
spellingShingle	Q Science (General) TJ212 Control engineering Mahmood, Iskandar Al-Thani Moheimani, S.O. Reza Making a commercial atomic force microscope more accurate and faster using positive position feedback control
description	This paper presents experimental implementation of a positive position feedback (PPF) control scheme for vibration and cross-coupling compensation of a piezoelectric tube scanner in a commercial atomic force microscope (AFM). The AFM is a device capable of generating images with extremely high resolutions down to the atomic level. It is also being used in applications that involve manipulation of matter at a nanoscale. Early AFMs were operated in open loop. Consequently, they were susceptible to piezoelectric creep, thermal drift, hysteresis nonlinearity, and scan-induced vibration. These effects tend to distort the generated image and slow down the scanning speed of the device. Recently, a new generation of AFMs has emerged that utilizes position sensors to measure displacements of the scanner in three dimensions. These AFMs are equipped with feedback control loops that work to minimize the adverse effects of hysteresis, piezoelectric creep, and thermal drift on the obtained image using proportional-plus-integral _PI_ controllers. These feedback controllers are often not designed to deal with the highly resonant nature of an AFM’s scanner nor with the cross coupling between various axes. In this paper we illustrate the improvement in accuracy and imaging speed that can be achieved by using a properly designed feedback controller such as a PPF controller. Such controllers can be incorporated into most modern AFMs with minimal effort since they can be implemented in software with the existing hardware. Experimental results show that by implementing the PPF control scheme, relatively good images in comparison with a well-tuned PI controller can still be obtained up to line scan of 60 Hz.
format	Article
author	Mahmood, Iskandar Al-Thani Moheimani, S.O. Reza
author_facet	Mahmood, Iskandar Al-Thani Moheimani, S.O. Reza
author_sort	Mahmood, Iskandar Al-Thani
title	Making a commercial atomic force microscope more accurate and faster using positive position feedback control
title_short	Making a commercial atomic force microscope more accurate and faster using positive position feedback control
title_full	Making a commercial atomic force microscope more accurate and faster using positive position feedback control
title_fullStr	Making a commercial atomic force microscope more accurate and faster using positive position feedback control
title_full_unstemmed	Making a commercial atomic force microscope more accurate and faster using positive position feedback control
title_sort	making a commercial atomic force microscope more accurate and faster using positive position feedback control
publisher	American Institute of Physics (AIP)
publishDate	2009
url	http://irep.iium.edu.my/5202/ http://irep.iium.edu.my/5202/ http://irep.iium.edu.my/5202/ http://irep.iium.edu.my/5202/1/Making_a_commercial_atomic_force_microscope_more_accurate_and_faster_using_positive_position_feedback_control.pdf
first_indexed	2023-09-18T20:13:41Z
last_indexed	2023-09-18T20:13:41Z
_version_	1777407646142300160

Making a commercial atomic force microscope more accurate and faster using positive position feedback control

Similar Items