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A microchip microcontroller-based transducer controller for non-contact scanning probe microscopy with phase-locked

Venkat Chandrasekhar¹

¹Department of Physics, Northwestern University, Evanston, Illinois 60208, USA.

The Review of Scientific Instruments

|March 2, 2020

Summary

A new, affordable scanning probe microscopy (SPM) transducer controller uses a microcontroller for versatile feedback control. This versatile device enables precise measurements with non-contact transducers.

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Area of Science:

Materials Science
Instrumentation
Physics

Background:

Scanning Probe Microscopy (SPM) requires precise control of non-contact transducers.
Existing controllers can be expensive and lack flexibility.
Microcontroller-based solutions offer potential for cost-effectiveness and adaptability.

Purpose of the Study:

To describe an inexpensive and versatile transducer controller for non-contact SPM.
To detail the software-based implementation of core control functions.
To demonstrate the controller's compatibility with various oscillating transducers.

Main Methods:

Development of a controller utilizing a PIC32 microcontroller.
Implementation of feedback control modes including amplitude, phase, and frequency-shift (phase-locked loop).
Software instantiation of control functions for rapid parameter adjustment and communication via serial connection.

Main Results:

The controller successfully implemented multiple feedback control modes.
Software-based functions allowed for flexible and rapid changes in operating parameters.
The system demonstrated functionality with a quartz tuning-fork transducer.

Conclusions:

The described microcontroller-based transducer controller is a cost-effective and versatile solution for non-contact SPM.
Its software-driven design facilitates easy adaptation and modification for diverse applications.
This approach enhances the accessibility and utility of SPM instrumentation.