A broadband probe for studies of acoustic surface waves

Harnik, E.

doi:10.1088/0022-3735/10/12/005

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…It emitted a single-cycle pulse centred on 2.37 MHz which corresponds approximately to a 3 mm wavelength. The receiver was a thin (about 0.2 mm) broadband probe as designed by Harnik (1977). It was oriented perpendicularly to the surface and parallel to the slot at various distances (increasing by steps of 1.27 mm) from the slot.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

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Interaction of a compressional impulse with a slot normal to the surface of an elastic half space

Ilan

Bond

Spivack

1979

Geophysical Journal International

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An improved finite difference scheme is applied to simulate wave propagation in the vicinity of a slot normal to the surface of an elastic half space. It provides visualization of the scattered wave pattern at a sequence of time steps, and also the components of displacement as functions of time at a series of observation points.After being hit by a normally incident plane P pulse, the slot oscillates with two main cycles and two shear-compressional pairs of diffracted waves, and also Rayleigh pulses, are scattered from it. The resulting wavefronts are parallel to the vertical surfaces of the slot and curve in semicircular arcs around the bottom of the slot.Experimental tests of the theory were performed, using 0.5-6 MHz ultrasonic pulses on duralumin cylinders with surface-breaking slots ranging from 0.5-2 mm in width and from 2-6 mm in depth. The numerical results were confirmed by these experiments.

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Section: Comparison With Experimental Resultsmentioning

confidence: 99%

“…The various methods used are summarized in a survey paper by Hudson (1977). They apply mainly to scatterers with slopes at small angles to the surface, and with dimensions which are not large in comparison with the initial wavelength.…”

Section: Introductionmentioning

confidence: 99%

Interaction of a compressional impulse with a slot normal to the surface of an elastic half space

Ilan

Bond

Spivack

1979

Geophysical Journal International

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“…The basic transducer configuration was the same as for the earlier measurements, being that shown in Fig. 11, with the transmitter in position C. In addition, the wedge transducer was replaced with a special transducer used t o detect the vertical component of displacement, which is a modified form of the design given by Harnik (1977), due to Bond (1978). The receiving transducer was placed in a series of positions moving across the flat surface of the block (Fig.…”

Section: Description Of Experimentsmentioning

confidence: 99%

Interaction of a compressional impulse with a slot normal to the surface of an elastic half space -- II

Ilan¹,

Bond²

1981

Geophysical Journal International

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An improved finite difference scheme has been used to simulate the propagation of a plane P-impulse in an elastic half space with a slot normal to its surface. Various angles of incidence and dimensions of slot are considered. The numerical results are presented in several visualizations; each emphasized a different type of wave and all representations help in understanding the scattered and diffracted wave pattern. Experiments were carried out using 0.5-6MHz ultrasonic pulses on a duralumin semidisc with a surface-breaking slot and the results are compared with those given by the numerical models.The scattered wavefield includes compressional and Rayleigh pulses whose amplitude increases at the front of the slot and decreases behind it, as the angle of incidence is reduced. A diffracted compressional pulse is generated with a semicircular wavefront centred at the mid-point of the bottom of the slot. Also, two elliptical eddies are excited at the lower corners. These ellipses propagate into the medium and eventually spread out to form arc-shaped shear pulses.In the shadow zone, behind the slot, the two components of displacement show independent behaviour. The horizontal component decreases either with decreasing angle of incidence or as the slot is made deeper. For acute angles, a reduction of displacement amplitude of about 50 per cent is obtained when the depth of the slot is made a half pulse width. On the other hand there is no diminution of the vertical displacement behind the slot, and, near the upper right corner, it is even amplified.

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“…By using a different transducer, this wave also can be confirmed. In Chapter IV, we mentioned the Harnik type transducer [103]. It is a wafer-thin P wave transducer which may be used in conjunction with a standard wedge type Rayleigh wave transducer as a pair in the pitch-catch mode.…”

Section: Literature Reviewmentioning

confidence: 99%

The interactions of ultrasonic Rayleigh waves with surface discontinuities in steel

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A broadband probe for studies of acoustic surface waves

Cited by 8 publications

References 2 publications

Interaction of a compressional impulse with a slot normal to the surface of an elastic half space

Interaction of a compressional impulse with a slot normal to the surface of an elastic half space

Interaction of a compressional impulse with a slot normal to the surface of an elastic half space -- II

The interactions of ultrasonic Rayleigh waves with surface discontinuities in steel

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