Increasing the efficiency of carbon nano tube, thin film loudspeakers

Benjamin S. Beck, Michael E. Zugger, Timothy A. Brungart, Joseph E. Fredley, Brian L. Kline, Zachary W. Yoas

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

Components of a small prototype carbon nanotube (CNT), thin film loudspeaker were designed and constructed in order determine their sound generation efficiency and sound pressure output. The loudspeaker efficiency was increased as the number of CNT film layers was decreased. The films, however, could withstand higher input power levels and generate higher sound pressures with more layers, up to four layers. With more than 4 CNT film layers, the input power level that resulted in catastrophic burnout was reduced due, presumably, to non-uniformities in the overlapping CNT film layers. Outside an enclosure, the CNT film layer mounted on a finned heat sink and base plate displayed unwanted, narrowband band-stop behavior. Neither the height nor spacing of the fins had a significant effect on the frequency, bandwidth or magnitude of the reduction in sound pressure. When the base plate with the heat sink was placed inside the enclosure, the resonant modes of the enclosure reduced the effect of the heat sink stop band. Combined with a horn and with all efficiency improvements incorporated into it, the small prototype CNT loudspeaker's efficiency was 10 to 15 dB greater than that of a much larger prototype CNT thin film loudspeaker.

Original languageEnglish (US)
StatePublished - Jan 1 2015
Event44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States
Duration: Aug 9 2015Aug 12 2015

Other

Other44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015
CountryUnited States
CitySan Francisco
Period8/9/158/12/15

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All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

Beck, B. S., Zugger, M. E., Brungart, T. A., Fredley, J. E., Kline, B. L., & Yoas, Z. W. (2015). Increasing the efficiency of carbon nano tube, thin film loudspeakers. Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States.