A 3D-printed acoustic spanner

Toninelli, E., Cox, M. A., Gibson, G., Brown, S. D., Edgar, M., Forbes, A. and Padgett, M. (2018) A 3D-printed acoustic spanner. [Data Collection]

Collection description

The two movie clips show the transfer of acoustic orbital angular momentum (OAM) to matter. More specifically, the acoustic spanner is used to set macroscopic objects into rotational motion. The first clip named 'peanut.mov' shows a polystyrene packing peanut spinning both clockwise and counter-clockwise as the handedness of the acoustic OAM is switched. As the sound field is switched to a uniform phase, the packing peanut stops moving. The second clip named 'floatingGraphite.mov' shows a considerable number of graphite flakes floating on the surface of water being set into rotation by the acoustic spanner. From a qualitative point of view, the rotating flakes and their distribution of velocities is indicative of the acoustic OAM field that they intercept.

The camera that captured these videos was placed beneath the transparent Petri-dish sample-holder, pointed upward and looking up at the small end of the funnel-shaped acoustic concentrator (see Fig. 1 of the manuscript to locate the sample holder and the acoustic concentrator).

The designs for the 3D printer of all of the printed parts of the acoustic spanner are found in the 3Dprinter folder. Both .STL and native Autodesk Fusion 360 .f3d files are provided. The .STL files are ready to be printed (we used Cura v. 2.3.1 to generate from these the .gcode files for the printer).

The Arduino code is provided and can be found in the arduino folder (note the directions to fix the Arduino PWM frequency bug, as indicated in the commented lines at the beginning of the Arduino sketch file).

A copy of all of the files is stored on GitHub at the following link: https://github.com/witseie/AcousticSpanner

College / School: College of Science and Engineering > School of Physics and Astronomy
Date Deposited: 15 Aug 2018 15:33
Related resource URL: https://github.com/witseie/AcousticSpanner
Funder's Name: Engineering and Physical Sciences Research Council (EPSRC), Engineering and Physical Sciences Research Council (EPSRC), European Research Council (ERC)
URI: http://researchdata.gla.ac.uk/id/eprint/628

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Toninelli, E., Cox, M. A., Gibson, G., Brown, S. D., Edgar, M., Forbes, A. and Padgett, M. (2018); A 3D-printed acoustic spanner

University of Glasgow

DOI: 10.5525/gla.researchdata.628

Retrieved: 2019-09-21