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A large ultrasonic bounded acoustic pulse transducer for acoustic transmission goniometry: Modeling and calibration
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10.1121/1.2133683
/content/asa/journal/jasa/119/1/10.1121/1.2133683
http://aip.metastore.ingenta.com/content/asa/journal/jasa/119/1/10.1121/1.2133683

Figures

Image of FIG. 1.
FIG. 1.

Photograph of measurement system.

Image of FIG. 2.
FIG. 2.

Simplified diagram of the experimental configuration as seen from above. Coordinate system has origin at the center of the face of the large transmitter T. Receiver R mounted on alignment rod and sample plate S mounted on goniometer table G are both centered on axis. The angle of incidence is equivalent to the angle that the sample face normal makes with respect to the axis; measurements are made at both negative and positive .

Image of FIG. 3.
FIG. 3.

Cut-away views of the (a) large transmitter and (b) small receiver.

Image of FIG. 4.
FIG. 4.

Typical waveform recorded along the axis of the large transducer in the (a) time domain and (b) normalized amplitude spectrum.

Image of FIG. 5.
FIG. 5.

(Color online) Images of diffraction behavior of the large transducer in water. Scans of the bounded pulse recorded with the receiver along the short dimension of the large transducer at distances from its surface of (a) and (b) . (c) Modeled scan at calculated using the input of (a).

Image of FIG. 6.
FIG. 6.

Quantitative comparison of observed and model peak envelope amplitudes. (a) Peak pulse amplitudes observed from large transducer surface along its long and short dimensions. Comparison of observed and modeled peak pulse amplitudes (b) along the long transducer dimension perpendicular to the bounded pulse propagation axis from the surface of the large transducer, and (c) with distance from the transmitter surface along the bounded beam axis.

Image of FIG. 7.
FIG. 7.

(Color online) Modeled bounded pulse energy along the propagation path as represented by the maximum of the Hilbert amplitude envelope.

Image of FIG. 8.
FIG. 8.

(Color online) Observed (a) and modeled (b) composite images for the thin acrylic glass. Each trace is normalized to its rms value and amplitudes greater than of the maximum amplitude are clipped in order for small amplitudes to display properly.

Image of FIG. 9.
FIG. 9.

(Color online) Observed (a) and modeled (b) composite images for the thick acrylic glass. Each trace is normalized to its rms value and amplitudes greater than of the true amplitudes are clipped in order for small amplitudes to display properly.

Image of FIG. 10.
FIG. 10.

(Color online) Observed (a) and modeled (b) composite images for the soda-lime glass plate. Each trace at angles less than the critical angle is normalized with respect to its rms value and traces at angles greater than the critical angle to three times their rms values.

Image of FIG. 11.
FIG. 11.

(Color online) Modeled propagation of the bounded pulse precritically incident at 20° upon the thin acrylic glass plate immersed in water. Display is shown to scale and amplitudes greater than half of the maximum true amplitude are clipped in order for small amplitudes to display properly. The critical angle in this case is . The origin of the center bounded acoustic pulse is not shown and is located at and . The direct distance between the source and the receiver is . Visualizations of some of the components of the wave field at times of (a) with bounded pulse in water incident to first surface, (b) partway through contact of pulse with first surface (note generation of a reflected and transmitted and a converted transmitted arrival, and (c) at showing nearly completed reflected and transmitted pulses.

Image of FIG. 12.
FIG. 12.

(Color online) Modeled propagation of the bounded pulse postcritically incident at 40° upon the thin acrylic glass plate immersed in water that includes only the edge diffraction arrivals; the primary reflection from the first surface and any induced multiples are not included in the model. Display is shown to scale and amplitudes greater than one-third of the maximum true amplitude are clipped in order for small amplitudes to display properly. The origin of the center of the bounded pulse is located at and . (a) at a time after edge 1 has contacted the first surface with the diffractions transmitted into the plate and the underlying water. (b) at a time after the diffracted arrival from edge 2 has contacted the first surface with the diffractions transmitted into the plate and the underlying water. (c) after both edge diffractions have propagated through the plate. See Fig. 11 for “edge 1 and edge 2 labels.”

Image of FIG. 13.
FIG. 13.

(a) Observed wave field produced by the large transmitter. (b) Modeled wave field propagated to a distance of for a small -diam spherical source for illustration. (c) Recorded passive noise.

Image of FIG. 14.
FIG. 14.

(Color online) Comparison of the P and S transmitted amplitudes both observed and calculated using plane wave assumptions both with and without attenuation for the thin acrylic glass sample.

Tables

Generic image for table
TABLE I.

Sample characteristics.

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/content/asa/journal/jasa/119/1/10.1121/1.2133683
2006-01-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A large ultrasonic bounded acoustic pulse transducer for acoustic transmission goniometry: Modeling and calibration
http://aip.metastore.ingenta.com/content/asa/journal/jasa/119/1/10.1121/1.2133683
10.1121/1.2133683
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