Quartz tuning fork (QTF) sensors offer an attractive alternative to traditional silicon microcantilevers for sensing applications in dynamic atomic force microscopy (DAFM). The QTF sensor consists of two identical, weakly-coupled tines with a sharp tip affixed to the distal end of one tine. The fundamental anti-phase mode of the QTF achieves a stable resonant frequency with a high Quality factor making it ideal for DAFM applications in which a small shift in the resonant frequency is linked to a tip-sample force. The addition of the tip-sample force also breaks the symmetry of the QTF leading to a classic eigenvalue veering scenario. The eigenvalue veering and accompanying mode localization phenomena violate the standard DAFM modeling assumptions which treat the addition of the tip-sample force as a small perturbation to a single-degree-of-freedom oscillator. We find that the eigenvalue veering can contribute a systematic error in force measurements on the order of 20%. Methodology for correcting the systematic error caused by eigenvalue veering is proposed.
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ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 17–20, 2014
Buffalo, New York, USA
Conference Sponsors:
- Design Engineering Division
- Computers and Information in Engineering Division
ISBN:
978-0-7918-4635-3
PROCEEDINGS PAPER
Eigenvalue Veering in Quartz Tuning Fork Sensors and its Effect on Dynamic Atomic Force Microscopy
John Melcher
John Melcher
National Institute of Standards and Technology, Gaithersburg, MD
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John Melcher
National Institute of Standards and Technology, Gaithersburg, MD
Paper No:
DETC2014-35673, V004T09A033; 6 pages
Published Online:
January 13, 2015
Citation
Melcher, J. "Eigenvalue Veering in Quartz Tuning Fork Sensors and its Effect on Dynamic Atomic Force Microscopy." Proceedings of the ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 4: 19th Design for Manufacturing and the Life Cycle Conference; 8th International Conference on Micro- and Nanosystems. Buffalo, New York, USA. August 17–20, 2014. V004T09A033. ASME. https://doi.org/10.1115/DETC2014-35673
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