TY - GEN
T1 - Design and control of tapping mode atomic force microscope in liquid utilizing optical pickup system
AU - Hu, Wan Lin
AU - Hung, Shao-Kang
AU - Yen, Shih Hsun
AU - Fu, Li Chen
PY - 2009/12/14
Y1 - 2009/12/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=71549131918&partnerID=8YFLogxK
U2 - 10.1109/ICCAS.2008.4694604
DO - 10.1109/ICCAS.2008.4694604
M3 - Conference contribution
AN - SCOPUS:71549131918
SN - 9788995605691
T3 - Proceedings of 2009 7th Asian Control Conference, ASCC 2009
SP - 15
EP - 20
BT - Proceedings of 2009 7th Asian Control Conference, ASCC 2009
Y2 - 27 August 2009 through 29 August 2009
ER -