Optical probing of ultrasonic pulses

Wolf, John W.; Neighbors, Thomas H.; Mayer, Walter G.

doi:10.1016/0041-624x(89)90057-7

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…The schlieren system developed at Bath has also been used to investigate the resonance behavior of elliptical 14,15 and stadium shaped 16 cavities. A low-frequency experimental arrangement using light diffraction techniques has also been reported by Wolf et al 17 The present study concerns itself with the interpretation of cavity resonance images obtained with the schlieren system. Of particular concern are the effects that the spatial filtering arrangement and acoustic pressure levels have on the optical image.…”

Section: Introductionmentioning

confidence: 91%

“…1͒ is based upon a standard Z configuration. 12,17 A pair of condensing lenses focus the light from a high-power light emitting diode onto a pinhole, which acts as an effective optical source. The light transmitted by the pinhole is collimated by the first parabolic mirror and passed through the water-filled tank containing the acoustic field and test object.…”

Section: B Experimental Systemmentioning

confidence: 99%

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The schlieren image of two-dimensional ultrasonic fields and cavity resonances

Chinnery

Humphrey

Beckett

1997

The Journal of the Acoustical Society of America

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The schlieren technique can be used to visualize the two-dimensional ultrasonic standing wave fields associated with circular cylindrical shells under resonance conditions. However, the interpretation of the schlieren image is not simple due to the complex relationship between the acoustic and optical fields. A model for predicting the optical image in an ideal schlieren system is presented and used to investigate the influence of the acoustic pressure and optical spatial filtering on the resultant image, demonstrating the conditions under which the image is a meaningful representation of the acoustic wave field. A low-frequency ͑Ͼ100 kHz͒, wide-aperture, laboratory schlieren system is used to image the fluid column resonances of a circular cylindrical shell. Experimental results agree well with the predictions, validating the theory. Although the schlieren image is two-dimensional, limiting investigations to targets having translational symmetry, the technique is noninvasive and can potentially provide greater insight into the acoustic resonance behavior of more complex scattering geometries.

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Section: Introductionmentioning

confidence: 91%

Section: B Experimental Systemmentioning

confidence: 99%