Active Q control in tuning-fork-based atomic force microscopy
Active Q control in tuning-fork-based atomic force microscopy
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DOI：
10.1063/1.2753112
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发表时间：
2007-07-09
影响因子：
4
通讯作者：
Jhe, Wonho
中科院分区：
文献类型：
--
作者：
Jahng, Junghoon;Lee, Manhee;Jhe, Wonho
对自振石英音叉的主动Q控制进行了全面的理论分析和实验实现。结果表明，通过将相对于驱动信号的任何相位滞后的信号相加，可以增加(减小)品质因数Q，范围为(1)到(1)+pi((1)+pi到(1)+2pi)。在实验上，在环境条件下，名义Q值4.7×10(3)减小到1.8×10(3)或增加到5.0×10(4)，在1赫兹时最小可测力估计为4.9×10(-14)N。在广泛使用的石英TF中展示的新型Q控制方案有望对扫描探针显微镜，特别是软材料和生物材料的扫描探针显微镜做出很大贡献。(C)2007年美国物理研究所。
The authors present comprehensive theoretical analysis and experimental realization of active Q control for the self-oscillating quartz tuning fork (TF). It is shown that the quality factor Q can be increased (decreased) by adding the signal of any phase lag, with respect to the drive signal, in the range of theta(1) to theta(1)+pi (theta(1)+pi to theta(1)+2 pi), where theta(1) is the characteristic constant of TF. Experimentally, the nominal Q value of 4.7x10(3) is decreased to 1.8x10(3) or increased to 5.0x10(4) in ambient condition, where the minimum detectable force is estimated to be 4.9x10(-14) N at 1 Hz. The novel Q control scheme demonstrated in the widely used quartz TF is expected to contribute much to scanning probe microscopy of, in particular, soft and biological materials. (C) 2007 American Institute of Physics.