Broadband versus narrowband experimental methods in acoustics
Active acoustic measurements (those requiring the input of acoustic energy) can be broadly classified as either broadband or narrowband. In a broadband technique, the acoustic energy introduced into the system is highly localized in time (i.e., a sharp pulse). When transformed into the frequency dom...
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Veröffentlicht in: | The Journal of the Acoustical Society of America 2011-04, Vol.129 (4_Supplement), p.2647-2647 |
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Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | Active acoustic measurements (those requiring the input of acoustic energy) can be broadly classified as either broadband or narrowband. In a broadband technique, the acoustic energy introduced into the system is highly localized in time (i.e., a sharp pulse). When transformed into the frequency domain using Fourier analysis, it becomes clear that this energy is spread over a wide frequency range. In a narrowband technique, the acoustic energy is introduced over a longer time period and occupies a much more localized region in the frequency domain. The limit being a single tone excitation signal. Benefits and drawbacks for each of these methods will be discussed as they are applied to several experimental systems including resonance and pulse-echo measurements. |
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ISSN: | 0001-4966 1520-8524 |
DOI: | 10.1121/1.3588824 |