V(Z) of the surface acoustic wave focusing system
Date
1986-11Source Title
IEEE 1986 Ultrasonics Symposium
Publisher
IEEE
Pages
727 - 730
Language
English
Type
Conference PaperItem Usage Stats
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Abstract
It is possible to define a V(Z) function
for the surface acoustic wave (SAW)
focusing system for a class of reflectors
similar to that defined in acoustic microscopy.
In this case V(Z) is a function which
relates the transducer output voltage to
the distance between the focal point and
the reflection line. It is possible to express
V(Z) in an analytical expression
using angular spectrum techniques. V(Z) is
measured for straight edge reflectors forming
various angles with the surface. V(2)
of straight step reflectors are investigated.
These curves show a dependence on
the type of reflector. The experiments are
performed at 1.5 MHz in conjunction with a
computerized data acquisition system. The
phase information is also recorded in all
these measurements in addition to the amplitude.
It is possible to get an inversion
of V(Z) to get the SAW reflection coefficient
at a straight discontinuity.
Keywords
Surface acoustic wavesAcoustic waves
Reflection
Surface waves
Aluminum
Fourier transforms
Mirrors
Pulse measurements
Geometry
Equations