Unknown

Dataset Information

0

Acoustic standing wave suppression using randomized phase-shift-keying excitations.


ABSTRACT: 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.

SUBMITTER: Tang SC 

PROVIDER: S-EPMC2771052 | biostudies-other | 2009 Oct

REPOSITORIES: biostudies-other

Similar Datasets

| S-EPMC4188268 | biostudies-literature
| S-EPMC7391735 | biostudies-literature
| S-EPMC6414262 | biostudies-literature
| S-EPMC3956078 | biostudies-literature
| S-EPMC4442640 | biostudies-literature
| S-EPMC6291339 | biostudies-literature
| S-EPMC4856433 | biostudies-literature
| S-EPMC3364803 | biostudies-other
| S-EPMC8267599 | biostudies-literature
| S-EPMC8233446 | biostudies-literature