Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1994-03-14
1995-10-31
Pihulic, Daniel L.
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
H04B 1700
Patent
active
054635934
ABSTRACT:
A schlieren imaging system provides quantitative images suitable for testing medical equipment. One embodiment includes precision optics which form an image of a volume of a medium through which an ultrasonic acoustic wave propagates. A spatial filter passes diffracted light but blocks other light. A camera forms an image of the medium from the diffracted light so that regions of the medium which diffract light have higher light intensity in the image. From image intensities, a processor determines acoustic pressures or intensities, typically as a value indicating an integral of the acoustic pressure or intensity along an optical path through the volume. Integrated pressure is determined from a look-up table which relates predicted light intensity to pressure values which cause the predicted light intensity. The system is calibrated by forming an image of a reference ultrasonic acoustic wave and determining a relation between the image intensities and predicted intensities. The system may include a timing circuit which periodically activates and deactivates a transducer and causes emission of synchronized pulses of light. The pulses of light are synchronized with a selected delay after activations of the transducer, so that an image is formed which shows an ultrasonic acoustic wave that has evolved during the delay.
REFERENCES:
patent: 4081216 (1978-03-01), Cook
Holm et al, "Optical Diffraction Tomography of Ultrasonic Fields with Algebraic Reconstruction Techniques, " IEEE Ultrasonics Symposium 1990 (1990), pp. 685-688.
Carl W. Hennige, "Schlieren Optical System for Visualizing Ultrasonic Waves, " Materials Evaluation, vol. 47 (May, 1989), pp. 496-687.
W. R. Klein and Bill D. Cook, "Unified Approach to Ultrasonic Light Diffraction, " IEEE Transactions on Sonics and Ultrasonics, vol. SU-14, No. 3 (July, 1967), pp. 123-134.
P. N. T. Wells, Physical Principles of Ultrasonic Diagnosis, Academic Press, 1969, pp. 65-69 and 233-234.
Bill D. Cook et al., "A Numerial Procedure for Calculating the Integrated Acoustooptic Effect, " IEEE Transactions on Sonics and Ultrasonics, vol. SU-27, No. 4 (Jul. 1980), pp. 202-207.
Peter D. Edmonds, Ultrasonics, vol. 19, Academic Press Inc. (1981), pp. 472-475.
Frederick Kuliasko et al, "Diffraction of Light by Supersonic Waves: The Solltion of the Raman-Nath Equations-I, " Proc. Indian Acad. Sci. A, vol. 67 (1968), pp. 295-302.
Michael E. Haran, "Comparison of an Acousto-Optic and a Radiation Force Method of Measuring Ultrasonic Power, " J. Acoust. Soc. Am., vol. 57, No. 6 Part II (Jun. 1975), pp. 1436-1440.
Andrzej Cwik and Helmut Ermert, "A Quantitative Schlieren Method For the Investigation of Axisymmetrical Shock Waves, " IEEE Ultrasonics Symposium Proceedings (1993), pp. 789-792.
Gordon S. Kino, Acoustic Waves: Devices, Imaging, and Analog Signal Processing, Prentice--Hall, Inc., pp. 509-511, 536.
Dale Ensminger, Ultrasonics, Fundamentals, Technology, Applications, Second Ed., Revised and Expanded, Marcell Dekker, Inc., pp. 368-370, 388.
Rainer Reibold and Walter Molkenstruck, "Optical Measuring Techniques, " Ultrasonic Exposimetry, CRC Press (1993), pp. 143-162.
Whitehead Frank R.
Zanelli Claudio I.
Claudio I. Zanelli, Intec Research Company
Gunnison Forrest E.
Millers David T.
Pihulic Daniel L.
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