An inexpensive yet versatile transducer controller for non-contact scanning probe microscopy (SPM) based on a PIC32 microcontroller from Microchip Technology, Inc is described. In addition to feedback control using the amplitude or phase of the signal from the non-contact transducer, the controller includes a phase-locked loop for frequency-shift feedback, as well as fixed-amplitude, quality factor (Q) control, and self-excitation modes. Apart from the input amplifiers, output buffers, and the Q-control circuit, all other functions of the controller are instantiated in software on the microchip, enabling rapid changes in operating parameters if needed. The controller communicates with a host personal computer via a simple serial connection. The controller has been tested with a quartz tuning-fork transducer but can be used with any oscillating non-contact transducer.

中文翻译：

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基于微芯片微控制器的传感器控制器，用于具有锁相环、幅度和 Q 控制的非接触式扫描探针显微镜

描述了一种基于 Microchip Technology, Inc 的 PIC32 微控制器的用于非接触式扫描探针显微镜 (SPM) 的廉价但通用的传感器控制器。除了使用来自非接触式换能器的信号的幅度或相位进行反馈控制外，控制器还包括用于频移反馈的锁相环，以及固定幅度、品质因数 (Q) 控制和自- 激励模式。除了输入放大器、输出缓冲器和 Q 控制电路外，控制器的所有其他功能都在微芯片上的软件中实例化，如果需要，可以快速更改操作参数。控制器通过简单的串行连接与主机个人计算机通信。