Near point-source longitudinal and transverse mode ultrasonic arrays for material characterization

Specially constructed near point-source ultrasonic transducers (0.75 MHz) were designed to preferentially stimulate and receive the one longitudinal (P) and two transverse (S) propagation modes. Arrays of these transducers were placed on a rectangular prism of common soda-lime glass, which served as...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2001-05, Vol.48 (3), p.691-698
Main Authors: Mah, M., Schmitt, D.R.
Format: Article
Language:English
Subjects:
Acoustic instruments, equipment, and techniques
Acoustical measurements and instrumentation
Acoustics
Anisotropic magnetoresistance
Arrays
Exact sciences and technology
Ferroelectric materials
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Geophysical measurements
Glass
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Measurement methods
Phase measurement
Phase velocity
Phased arrays
Physics
Prisms
Propagation modes
Pulse measurements
Testing
Transducers
Ultrasonic transducer arrays
Ultrasonic transducers
Ultrasonics, quantum acoustics, and physical effects of sound
Velocity measurement
Wave propagation
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Summary:Specially constructed near point-source ultrasonic transducers (0.75 MHz) were designed to preferentially stimulate and receive the one longitudinal (P) and two transverse (S) propagation modes. Arrays of these transducers were placed on a rectangular prism of common soda-lime glass, which served as an ideal homogeneous, isotropic medium, to evaluate the uncertainty of a newly developed phase velocity measurement method. Through the use of the Radon transform, the data were transformed from the offset-time (x-t) domain to the intercept time-horizontal slowness (/spl tau/-P) domain. From the shape of the curves in the /spl tau/-p domain, the phase velocity of the propagating waves may be determined for a range of directions. The phase velocities determined using this method were accurate for incidence angles up to 76/spl deg/, 64/spl deg/ and 77/spl deg/ for the P, SV, and SH wave modes, respectively. Phase velocities of 5724/spl plusmn/64, 3411/spl plusmn/30, and 3467/spl plusmn/15 m/s were determined for the P-wave, SV-wave, and SH-wave modes, respectively. This agrees with the direct transmission P-wave and S-wave velocities of 5690/spl plusmn/60 and 3440/spl plusmn/26 m/s, respectively, to better than 1%.
ISSN:0885-3010
1525-8955
DOI:10.1109/58.920695