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Ultrahigh-speed large-range atomic force microscope imaging
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Chen, Jiarong. Ultrahigh-speed large-range atomic force microscope imaging. Retrieved from https://doi.org/doi:10.7282/T3JQ14F5

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TitleUltrahigh-speed large-range atomic force microscope imaging
NameChen, Jiarong (author); Zou, Qingze (chair); Rutgers University; School of Graduate Studies
Date Created2018
Other Date2018-05 (degree)
SubjectElectrical and Computer Engineering, Atomic force microscopy
Extent1 online resource (vii, 34 p. : ill.)
DescriptionThis thesis presents the development of ultra-high-speed large-range dynamic mode imaging of atomic force microscope (AFM), through the extension of the adaptive multi-loop mode imaging technique to the eld-programmable gate array (FPGA) signal acquisition and processing hardware platform. High speed imaging is needed in atomic force microscope imaging to observe constantly changing processes such as chemical reaction on the sample surface, microorganism activity or macromolecules reactions. However, conventional imaging modes are too slow to observe such processes. Contact mode is faster than tapping mode but can damage the sample while tapping mode has less distortion but much slower. Such a speed limiation can be largely alleviated by the adaptive multi-loop mode (AMLM) technique which utilizes an online iterative feedforward controller to overcome the time delay of the z-feedback loop in tracking the topography. The goal of this thesis is to integrate the AMLM technique with the FPGA platform to further image the imaging speed by an order of mangitude without loss of quality and imaging range. Challenges in FPGA programming must be overcome to account for both the AFM system dynamics characteristics and the FPGA hardware speci cations. For instance, the (inverse) Fourier transform in the feedforward controller is replaced with time domain signals along with introducing the tapping amplitude error into the feedforward control and the tapping mode deflection decoupling technique. Moreover, a modeling-free inversion-based iterative feedforward control (MIIFC) approach is implemented for the x-axis piezo actuator control to track the high frequency triangular wave needed for high speed imaging. In the experiment a calibration reference sample is scanned to validate the control scheme and present the imaging results by comparing with the much slower conventional tapping image. The experimental results show that by using the AMLM imaging technique on FPGA board, the imaging speed increases from 5 Hz to 100 Hz while maintaining good imaging quality. However, although the main features of the sample topography are captured, many details are loss due to the time delay in the control system and high frequency noise.
NoteM.S.
NoteIncludes bibliographical references
Noteby Jiarong Chen
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T3JQ14F5
Languageeng
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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