Enhancing fixed-point control robustness for experimental non-contact scans with the Transverse-dynamic Force Microscope
Enhancing fixed-point control robustness for experimental non-contact scans with the Transverse-dynamic Force Microscope
复制标题
使用横向动力显微镜增强实验性非接触式扫描的定点控制鲁棒性
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Miles
中科院分区：
文献类型：
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作者：
Kaiqiang Zhang;T. Hatano;G. Herrmann;M. Antognozzi;C. Edwards;S. Burgess;Thang Nguyen;M. Miles
横向动态力显微镜（TDFM）是独一无二的，因为它使用垂直悬臂，真正允许扫描没有与样品的物理相互作用。最近，我们提出了一个简单的控制方案，真正的非接触式扫描使用TDFM。在FPGA系统（现场可编程门阵列）中实现的这种控制方案是为在给定试样上方的特定点处的非接触式控制任务而开发的，但是忽略了通过x-y载物台在水平面中的动态试样放置要求。考虑到大范围的样本，一个实用的方法已经开发出重新配置的定点算法控制实现，并允许在真正的非接触模式下的动态扫描。为此，已经开发了离线数值优化，其建立了控制算法的最合适的固定点范围，避免算法溢出。这创建了一种在非接触式扫描期间对设备和传感器非线性和动态变化鲁棒的实现。实验非接触扫描结果，在水中的纳米球，证明了成像能力的TDFM。
The Transverse Dynamic Force Microscope (TDFM) is unique as it uses a vertical cantilever, and genuinely permits scans without physical interaction with a specimen. Recently, we suggested a simple control scheme for true non-contact scans using the TDFM. This control scheme implemented in FPGA-systems (Field-Programmable Gate Arrays) was developed for a non-contact control task at specific points above a given specimen, but dynamic specimen placement requirements in the horizontal plane through an x-y stage were neglected. Considering the large range of the specimen, a practical approach has been developed which reconfigures the fixed-point-arithmetic control implementation and permits a dynamic scan in true non-contact mode. For this, an off-line numerical optimization has been developed which establishes the most suitable fixed-point ranges of the control algorithm, avoiding algorithm overflow. This creates an implementation robust to plant and sensor non-linearities and dynamic changes during non-contact scans. Experimental non-contact scanning results, for nano-spheres in water, demonstrate the imaging capacity of the TDFM.
非接触式横向动力显微镜标本跟踪控制器
DOI：
10.1109/acc.2016.7526838
发表时间：
2016
期刊：
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影响因子：
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作者：
Hatano T
通讯作者：
Hatano T