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Acoustic Standing Wave Suppression using Randomized Phase-shift-keying Excitations
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Institution: |
Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. |
Publisher: |
J Acoust Soc Am |
Publication Date: |
Oct-2009 |
Volume Number: |
126 |
Issue Number: |
4 |
Pages: |
1667-1670 |
Citation: |
J Acoust Soc Am. 2009 Oct;126(4):1667-70. |
PubMed ID: |
19813782 |
PMCID: |
PMC2771052 |
Keywords: |
acoustic signal processing, quadrature phase shift keying |
Appears in Collections: |
NCIGT, FUS |
Sponsors: |
U41 RR019703 (RR) funded by NCRR NIH HHS |
Generated Citation: |
Tang S.C., Clement G.T. Acoustic Standing Wave Suppression using Randomized Phase-shift-keying Excitations. J Acoust Soc Am. 2009 Oct;126(4):1667-70. PMID: 19813782. PMCID: PMC2771052. |
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| Paper: | Download, View online |
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Recent papers have demonstrated that acoustic standing waves can be inhibited by frequency-modulated spread-spectrum excitation. An alternative method is studied here that is designed to be more practical for implementation in phased arrays. The method operates using phase-shift-keying (PSK), which introduces phase shifts into the driving signal to break wave symmetry. Sequential and random binary-PSK (BPSK) and quadrature-PSK (QPSK) excitations are studied in water, using a carrier frequency of 250 kHz and a time segment of 10 cycles. The resulting acoustic field is measured with a transducer inside a plastic-walled chamber and compared with continuous wave excitation. Results indicate that both the random BPSK and QPSK methods can reduce time-averaged spatial intensity variation caused by standing waves by approximately six times.
Additional Material
1 File (122.896kB)
SCTang-JASA2009-fig5.jpg (122.896kB)