Measuring and testing – Vibration – By mechanical waves
Patent
1987-09-29
1988-12-06
Chapman, John
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
047888660
ABSTRACT:
The sound field of ultrasonic pulses emitted in a liquid-solid system is irradiated with polarized light, and the ultrasonic pulses in the liquid and in the solid are visualized simultaneously by detecting deflected light arising from a change in refractive index of the liquid caused by presence of the ultrasonic pulses, and polarized light arising from the birefringence in the solid caused by presence of the ultrasonic pulses. By quantitatively measuring the sound field, waveform, etc. of the ultrasonic pulses from an ultrasonic probe in the liquid by the schlieren method and in the solid by the photoelastic method simultaneously, it is possible to visualize the ultrasonic pulses in the liquid and solid at the same time. This enables ready measurement of the direction of emission of the ultrasonic pulses from the probe, the ultrasonic wavelength, the propagation velocity, etc., thus making it possible to perform a comprehensive performance evaluation and examination of sound field for various types of probes, inclusive of the water-submersible type.
REFERENCES:
V. M. Baborovsky, "Visualisation of Ultrasound in Solids", Physics in Technology, vol. 10, No. 4 (July 1979), pp. 171-177.
K. G. Hall, "Visualization Techniques for the Study of Ultrasonic Wave Propagation in the Railway Industry," Materials Evaluation, 42 (June 1984), pp. 922-929, 933.
Y. Tomita and A. Shima; "Mechanisms of Impulsive Pressure Generation and Damage Pit Formation by Bubble Collapse;" J. Fluid Mech. (1986), vol. 169, pp. 535-564.
D. M. Marsh; "Methods of Visualizing Ultrasound;" T. I. Research Laboratories, Hinxton Hall, Saffron Walden, Essex, Eng. pp. 317-367.
C. F. Ying, S. Y. Zhang & J. Z. Shen; "Scattering of Ultrasound in Solids as Visualized by the Photoelastic Technique;" Journal of Nondestructive Evaluation, vol. 4, No. 2, 1984; pp. 65-73.
J. Wiklund, "A Schlieren Study of the Generation of Different Types of Ultrasonic Waves in Thin Plates," NDT International, Aug. 1977; pp. 187-192.
K. G. Hall, "Railway Applications of Ultrasonic Wave Visualisation Techniques," British Journal of NDT; Mar. 1984; pp. 162-171.
Date Kazuhiro
Tanimoto Ken'ichi
Chapman John
Doryokuro Kakunenryo Kaihatsu Jigyodan
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