Amplitude Estimation Technique for Intermittent Contact Atomic Force Microscopy
This article describes how one of the biggest challenges in designing of high-speed intermittent contact atomic force microscope (AFM) is the construction of a fast amplitude detector. The measurement techniques commonly used in commercial microscopes, such as RMS to DC converters or lock-in amplifiers often do not provide sufficient bandwidth to perform high speed imaging. On the other hand, many techniques developed especially for high-speed AFM are characterized by poor signal-to-noise ratio. In this paper, a novel amplitude estimation method based on the generalized Goertzel algorithm is presented. The detection system, composed of 16-bit 100 mega-samples per second analog-to-digital converter and field-programmable gate array device, allows to measure the signal amplitude within the time comparable to one oscillation cycle of the AFM cantilever. The effectiveness and validity of the designed detector were investigated by computer simulation. High spatial resolution of the presented method implemented in the actual atomic force microscopy system is also demonstrated.
Year of publication: |
2017
|
---|---|
Authors: | Dobiński, Grzegorz ; Pawłowski, Sławomir ; Smolny, Marek |
Published in: |
International Journal of Measurement Technologies and Instrumentation Engineering (IJMTIE). - IGI Global, ISSN 2156-1729, ZDB-ID 2703525-6. - Vol. 6.2017, 2 (01.07.), p. 29-42
|
Publisher: |
IGI Global |
Subject: | AFM | Amplitude Detection | Atomic Force Microscopy | FPGA | Goertzel Algorithm | IC-AFM | Multifrequency High-Speed AFM | Recursive Oscillators |
Saved in:
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