Geology Reference
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Figure 1.5m.
Single piezoelectric transducer closest to siren
for constructive interference and nonlinear harmonic generation study.
Comments: For high data rate applications, piezoelectric transducers are
essential since they provide the required frequency response and data resolution
needed for signal processing. In the above, a single transducer close to the test
shed monitors the effects of constructive or destructive interference near the
pulser - this “efficiency” is compared with the 'p measurement obtained from
short wind tunnel analysis. In a sense, 'p characterizes the “brute force” ability
of a siren to create sound, while the single-transducer reading measures how
cleverly we can amplify it. Far away, transducer arrays collect data for multiple
transducer signal processing for echo cancellation and pump noise removal.
Figure 1.5n.
Distant multiple transducer array setup.
Comments: In the top photographs, a short plastic section is tapped for
close transducer placements needed for “very, very high” data rates
characterized by very short wavelengths. In the lower figure, a similar
configuration is used in the long acoustic wind tunnel.
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