Abstract:
:When a medium is rapidly heated and cooled, heat transfers to its surroundings as sound. A controllable source of this sound is realized through joule heating of thin, conductive films by an alternating current. Here, we show that arrays of these sources generate sound unique to this mechanism. From the sound alone, we spatially resolve current flow by varying the film geometry and electrical phase. Confinement concentrates heat to such a degree that the film properties become largely irrelevant. Electrical coupling between sources creates its own distinctive sound that depends on the current flow direction, making it unusually sensitive to the interactions of multiple currents sharing the same space. By controlling the flow, a full phased array can be created from just a single film.
journal_name
Sci Advjournal_title
Science advancesauthors
Tatnell DM,Heath MS,Hepplestone SP,Hibbins AP,Hornett SM,Horsley SAR,Horsell DWdoi
10.1126/sciadv.abb2752subject
Has Abstractpub_date
2020-07-01 00:00:00pages
eabb2752issue
27issn
2375-2548pii
abb2752journal_volume
6pub_type
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