TITLE

Second harmonic component in focused ultrasound transmitted through a solid plate

AUTHOR(S)
Saito, Shigemi
PUB. DATE
July 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 524 Issue 1, p199
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
To understand the property of a nonlinear second-harmonic image obtained by an acoustic microscope, the acoustic field beyond a thin solid plate inserted normal to a focused Gaussian beam set in water is studied theoretically and experimentally. When the plate is set so as to involve the whole beam, the second harmonic component newly generated beyond the plate cancels the second harmonic, which has passed through the plate, provided a particular condition is satisfied for the pressure transmission coefficients at the harmonic frequencies. When the plate edge interrupts the beam, the second harmonic amplitude detected by a concave receiver changes in a complicated manner to show a set of minimum and maximum as the edge moves in the focal plane while the fundamental pressure monotonously changes.
ACCESSION #
5665299

 

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