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A spacing compensation factor for the optimization of guided wave annular array transducers
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10.1121/1.4770238
/content/asa/journal/jasa/133/1/10.1121/1.4770238
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/1/10.1121/1.4770238

Figures

Image of FIG. 1.
FIG. 1.

Plane strain geometry of a generalized N-element comb array transducer with inner element width w and center-to-center spacing s.

Image of FIG. 2.
FIG. 2.

Axisymmetric geometry of a generalized N-element annular array transducer with inner radius r 0, element width w, and center-to-center spacing s.

Image of FIG. 3.
FIG. 3.

(Color online) Example 4-element comb and annular array excitation spectra with w = 0.5 s and r 0 = 0.5 s.

Image of FIG. 4.
FIG. 4.

(Color online) Correction factor as a function of N and r 0 for annular arrays.

Image of FIG. 5.
FIG. 5.

(Color online) Decrease in the excitation spectra for annular arrays with N elements and inner radius r 0 at λ = s.

Image of FIG. 6.
FIG. 6.

(Color online) Decrease in the excitation spectra for annular arrays with N elements and inner radius r 0 = 0.37 s, 0.63 s, and 0.50 s at λ = s. For some cases, the correction factor has a negligible effect on the excitation spectrum amplitude, while for others, the effect is severe.

Image of FIG. 7.
FIG. 7.

(Color Online) A0 mode generation from 0.5 s inner radius annular arrays with uncompensated spacing (dashed line) and compensated spacing (solid line).

Image of FIG. 8.
FIG. 8.

(Color Online) A0 mode generation from 0.7 s inner radius annular arrays with uncompensated spacing (dashed line) and compensated spacing (solid line).

Image of FIG. 9.
FIG. 9.

(Color Online) Time-frequency power spectral density plots of the compensated (top) and uncompensated (bottom) arrays, with inner radius r 0 = 0.5 s.

Image of FIG. 10.
FIG. 10.

(Color Online) Time-frequency power spectral density plots of the compensated (top) and uncompensated (bottom) arrays, with inner radius r 0 = 0.7 s.

Image of FIG. 11.
FIG. 11.

(Color Online) Cross-section of the time-frequency PSD plot of the compensated (solid line) and uncompensated (dashed line) arrays, r 0 = 0.5 s, at 300 kHz.

Image of FIG. 12.
FIG. 12.

(Color Online) Cross-section of the time-frequency PSD plot of the compensated (solid line) and uncompensated (dashed line) arrays, r 0 = 0.7 s, at 300 kHz.

Image of FIG. 13.
FIG. 13.

(Color Online) Dispersion curve for the 3.175-mm aluminum plate with the uncompensated (solid line) and compensated (dashed line) wavelength activation lines plotted. The circle shows the region of interest on the A0 mode.

Image of FIG. 14.
FIG. 14.

(Color online) Time-domain power spectral density plots showing the A0 mode as a function of excitation frequency.

Image of FIG. 15.
FIG. 15.

(Color online) Total energy in the A0 mode for each frequency of excitation, after the A0 mode excitability is taken into consideration.

Tables

Generic image for table
TABLE I.

Dimensions for compensated and uncompensated annular arrays with inner radii 0.5 s and 0.7 s used for spacing compensation factor FE verification.

Generic image for table
TABLE II.

Annular array transducer dimensions for experimental verification. Here f res indicates the thickness resonance of the annular array.

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/content/asa/journal/jasa/133/1/10.1121/1.4770238
2013-01-03
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A spacing compensation factor for the optimization of guided wave annular array transducers
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/1/10.1121/1.4770238
10.1121/1.4770238
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