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首页> 外文期刊>Mechanical systems and signal processing >Direct inverse linearization of piezoelectric actuator's initial loading curve and its applications in full-field optical coherence tomography (FF-OCT)
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Direct inverse linearization of piezoelectric actuator's initial loading curve and its applications in full-field optical coherence tomography (FF-OCT)

机译：压电执行器初始装载曲线的直接逆线性化及其在全场光学相干断层扫描（FF-OCT）中的应用

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摘要

Piezoelectric actuator (PEA) has become popular in spectroscopic optical coherence tomography (SOCT) as it can provide depth dependent spectra with sub-nanometer positioning resolution. However, the inherent hysteresis of the PEA introduces unwanted distortions to the obtained spectra and image. OCT imaging can be completed during the first forward motion of the PEA, i.e., the initial loading curve (ILC). Therefore, this paper proposes a feedforward hysteresis compensation method for the linearization of the ILC, aiming at improving the spectroscopic and imaging accuracy of OCT without any feedback on the PEA's displacement or feedback controllers. A polynomial operator is adopted as the hysteresis compensator and the coefficients are directly identified from the measured ILC, following the direct inverse modeling approach. Experimental results on a standalone PEA verifies that the proposed method is superior to the popular Prandtl-lshlinskii model in the linearization of the ILC. This proposed method is further implemented on a full-field OCT system to linearize the motion of the PEA-driven scanner. Experimental results show that the ILC of the scanner can be efficiently linearized. In vivo skin imaging is then performed to evaluate the performance of the proposed method. Ultra-high precision linearization enables remarkable positioning accuracy in the skin constituents and skin layers observed in the in vivo forearm cross-sectional skin image. Depth-dependent spectral analysis could quantify molecular/chemical composition of the tissue constituents accurately.
机译：压电致动器（PEA）在光谱光学相干断层扫描（SOCT）中变得流行，因为它可以提供具有子纳米定位分辨率的深度依赖性光谱。然而，豌豆的固有滞后向获得的光谱和图像引起了不希望的扭曲。 OCT成像可以在豌豆的第一前向动作期间完成，即，初始加载曲线（ILC）。因此，本文提出了一种用于ILC线性化的前馈滞后补偿方法，旨在提高OCT的光谱和成像精度，而没有对豌豆的位移或反馈控制器的任何反馈。采用多项式操作员作为滞后补偿器，并且通过直接反向建模方法，从测量的ILC直接识别系数。独立豌豆上的实验结果验证了所提出的方法优于ILC线性化的流行Prandtl-Lshlinskii模型。该提出的方法在全场OCT系统上进一步实现，以线性化PEA驱动扫描仪的运动。实验结果表明，扫描仪的ILC可以有效地线性化。然后进行体内皮肤成像以评估所提出的方法的性能。超高精度线性化能够在体内前臂横截面皮肤图像中观察到的皮肤成分和皮肤层中的显着定位精度。深度依赖性光谱分析可以精确地量化组织成分的分子/化学组成。

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  • 来源
    《Mechanical systems and signal processing》 |2021年第2期|107147.1-107147.13|共13页
  • 作者

    Yanding Qin; Rajendran Soundararajan; Rurui Jia; Sheng-Lung Huang;

  • 作者单位

    Institute of Robotics and Automatic Information System College of Artificial Intelligence Nankai University Tianjin 300071 China Tianjin Key Laboratory of Intelligent Robotics. Nankai University Tianjin 300071 China;

    Graduate Institute of Photonics and Optoelectronics National Taiwan University. Taipei 106 Taiwan;

    Institute of Robotics and Automatic Information System College of Artificial Intelligence Nankai University Tianjin 300071 China Tianjin Key Laboratory of Intelligent Robotics. Nankai University Tianjin 300071 China;

    Graduate Institute of Photonics and Optoelectronics National Taiwan University. Taipei 106 Taiwan Department of Electrical Engineering National Taiwan University Taipei 106 Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Piezoelectric actuator; Optical coherence tomography; Hysteresis; Direct inverse modeling; Feedforward control;

    机译：压电执行器;光学相干断层扫描;滞后;直接逆建模;前馈控制;

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