The Scanning Theremin Microscope: A Model Scanning Probe Instrument for Hands-On Activities

A model scanning probe microscope, designed using similar principles of operation to research instruments, is described. Proximity sensing is done using a capacitance probe, and a mechanical linkage is used to scan this probe across surfaces. The signal is transduced as an audio tone using a heterod...

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Bibliographic Details
Published in:Journal of chemical education 2014-02, Vol.91 (2), p.246-250
Main Authors: Quardokus, Rebecca C, Wasio, Natalie A, Kandel, S. Alex
Format: Article
Language:English
Subjects:
Chemistry
Circuits
Demonstrations (Educational)
Hands on Science
Laboratory Equipment
Microscopy
Musical instruments
Nanoscience
Nanotechnology
Scanning probe microscopes
Scanning probe microscopy
Science Activities
Science education
Science Instruction
Technology
Tone
Troubleshooting
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Description
Summary:A model scanning probe microscope, designed using similar principles of operation to research instruments, is described. Proximity sensing is done using a capacitance probe, and a mechanical linkage is used to scan this probe across surfaces. The signal is transduced as an audio tone using a heterodyne detection circuit analogous to that used in the theremin (one of the first electronic musical instruments, invented in the early 20th century). The instrument is useful for demonstrations and hands-on activities that introduce fundamentals of scanning probe microscopy and, by extension, nanoscience and nanotechnology. The details of instrument construction are provided, along with instructions for assembly and troubleshooting.
ISSN:0021-9584
1938-1328
DOI:10.1021/ed300751e