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- W2389742938 abstract "On the basis of numerical calculation of ultrasonic field of a spherically focusing radiator for various excitations such as continuous waves, attenuation waves and pulse waves, the characteristics of focal speckles for different excitations have been compared and the various factors which cause the changes of the characteristics of focal speckles have been studied. The calculation shows that the size of focal speckles for typical pulse wave used in Extracopereal Shock Wave Lithotripter(ESWL) is approximately as half as that for continuous wave when the main frequency of pulse is about equal to the frepuency of continuous wave. The variation tendency of pulse pressure waveform along acoustic axis and in the focal plane has been numerically studied also. No distinct change of pulse waveform in the domain of 6dB width of focus speckles has been observed. In addition, for both a spherical concave radiator and a spherically annular radiator, the changes of pressure envelopes and width of focal speckles have been numerically compared." @default.
- W2389742938 created "2016-06-24" @default.
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- W2389742938 date "2000-01-01" @default.
- W2389742938 modified "2023-09-25" @default.
- W2389742938 title "THE COMPARISON OF FOCAL SPECKLES OF A FOCUSING RADIATOR FOR VARIOUS EXCITATIONS" @default.
- W2389742938 hasPublicationYear "2000" @default.
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