Design and control of tapping mode atomic force microscope in liquid utilizing optical pickup system

Wan Lin Hu, Shao-Kang Hung, Shih Hsun Yen, Li Chen Fu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this work, we propose a fluid tapping mode atomic force microscopy (AFM) implemented by a DVD pickup head. The use of DVD pickup head minimizes the volume of the hardware system, and thus reduces the measurement error caused by heat expansion. In order to realize the system mentioned above, we design a Q-controller to modulate the interaction force between the tip and the sample. Increasing the quality factor will overcome the problem with high damping ratio in the fluid which makes the probe hard to oscillate. Because of the reduction of the tip-sample force, the sample surface will not be hurt by the tip. Therefore, we can use the AFM to scan soft sample, and obtain more realistic topography. Traditionally, people use proportion-integration controller to control the system. Users need to tune this kind of controller manually, and hence the quality of the scan images is highly related to users' experiences. To overcome this problem, we design an adaptive sliding-mode controller to improve the scanning capability and robustness.For testing the system capability, we will have a series of numerical simulations.

Original languageEnglish
Title of host publicationProceedings of 2009 7th Asian Control Conference, ASCC 2009
Pages15-20
Number of pages6
DOIs
StatePublished - 14 Dec 2009
Event2009 7th Asian Control Conference, ASCC 2009 - Hong Kong, China
Duration: 27 Aug 200929 Aug 2009

Publication series

NameProceedings of 2009 7th Asian Control Conference, ASCC 2009

Conference

Conference2009 7th Asian Control Conference, ASCC 2009
CountryChina
CityHong Kong
Period27/08/0929/08/09

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