Real-Time Force Reconstruction in a Transverse Dynamic Force Microscope
Real-Time Force Reconstruction in a Transverse Dynamic Force Microscope
复制标题
横向动态力显微镜中的实时力重建
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
G. Herrmann
中科院分区：
文献类型：
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作者：
Kaiqiang Zhang;T. Nguyen;C. Edwards;M. Antognozzi;M. Miles;G. Herrmann
力显微镜的一项主要功能是能够以高灵敏度测量力，从而可以了解重要机制：例如在生物样本中。对纳米尺度样本粘弹性的研究可以产生重大的科学影响，但由于缺乏快速、全面的扫描仪器而受到抑制。原则上，横向动力显微镜 (TDFM) 允许以非接触方式测量精密样品内的相互作用力。力测量是通过 TDFM 中复杂的离线分析来重建的，因此，它们很难用作在线力测量工具。本文介绍了一种新颖的集成稳健设计，用于使用 TDFM 系统进行实际扫描。数字设计是使用现场可编程门阵列器件以定点算术实现的，从而允许以高采样率测量相互作用力。新颖的数字设计解决了不同的实施问题，实现了快速、稳健的测力性能。这为 TDFM 提供了一种新的力扫描模式，首次实现了样品表面的实时在线力映射。
One major functionality of force microscopes is their ability to measure forces at a high sensitivity, thereby, allowing understanding of vital mechanisms: for instance, in bio-specimens. The investigation of a specimen’s viscoelasticity on nano-scale can have significant scientific impact, but has been inhibited by the lack of fast, comprehensive scanning instruments. In principle, transverse dynamic force microscopes (TDFMs) permit the measurement of interaction forces within delicate samples in a noncontact manner. The force measurements are reconstructed via complicated offline analysis in TDFMs, therefore, they can hardly be utilized as an online force measuring tool. This article introduces a novel integrated robust design for practical scanning using the TDFM system. The digital design is implemented in fixed-point arithmetic using field programmable gate array devices, thereby, permitting measurement of the interaction force at a high sampling rate. The novel digital design tackles different implementation issues achieving fast and robust force measuring performance. This enables a new force-scan mode for the TDFM, realizing for the first time, online force mapping of sample-surfaces in real-time.