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

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Journal of the Acoustical Society of America

DOI:https://doi.org/10.1121/1.417976· OSTI ID:489273

Chinnery, P A; Humphrey, V F; Beckett, C ^[1]

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1. School of Physics, University of Bath, Bath BA2 7AY (United Kingdom)

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 ({gt}100 kHz), 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. {copyright} {ital 1997 Acoustical Society of America.}

• OSTI ID: 489273
• Journal Information: Journal of the Acoustical Society of America, Journal Name: Journal of the Acoustical Society of America Journal Issue: 1 Vol. 101; ISSN 0001-4966; ISSN JASMAN
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ACOUSTIC TESTING
CAVITY RESONATORS
FLUIDS
FOURIER TRANSFORMATION
IMAGES
OPTICAL FILTERS
OPTICS
SCHLIEREN METHOD
SHELLS
STANDING WAVES
ULTRASONIC TESTING