Conical ultrasonic wave deflection system

Communications – electrical: acoustic wave systems and devices – Acoustic image conversion

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367138, 367150, 367151, 73642, G03B 4206

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active

051154145

ABSTRACT:
A conical ultrasonic wave deflection system has an ultrasonic transducer for ultrasonic microscopy using surface waves and/or Lamb waves in an object. A conical wave front is directed onto the object via a deflection element. An inactive axial circular disk is provided between the ultrasonic transducer and the object to minimize unnecessary interference from undeflected waves. A frustoconical lens with a blocked top face, or a conical metal reflector with a ring transducer on the transducer side can be provided as the deflection element. The arrangement is highly compatible with ultrasonic microscopes. Matching to a critical angle .theta. of the object is achieved by selection of the appropriate ultrasonic frequency.

REFERENCES:
patent: 3262307 (1966-07-01), Hart
patent: 4576048 (1986-03-01), Glenn
patent: 4779241 (1988-10-01), Atalar et al.
Zieniuk et al., "Ultrasonic Pin Scanning Microscope A New Approach to Ultrasonic Microscopy", 1986 Ultrasonics Symposium, IEEE, 1986, pp. 1037-1039.
Smith et al., "Confocal surface acoustic wave microscopy", Appl. Phys. Lett. 42(5), Mar. 1, 1983, pp. 411, 413.
Nongaillard et al., "A new focusing method for nondestructive evaluation by surface acoustic wave", J. Appl. Phys., 55(1), Jan. 1, 1984, pp. 75, 77, 79.
Ayter, "Focusing Surface Waves Using Conical Transducers", 1987 Ultrasonics Symposium, 1987 IEEE, pp. 301-304.
Atalar et al., "Measurement of Sensitivity of Different Wave Modes to Sub-surface Defects", 1988 Ultrasonics Symposium, 1988 IEEE, pp. 771-774.
Atalar et al., "A High Efficieny Lamb Wave Lens for Subsurface Imaging", Proc. IEEE, Ultrason, Symp., 1989, Oct. 3, 1989.
Krautkramer et al., "Werkstoffprufung mit Ultraschall", Springer-Verlag, 1986, pp. 34-38, 608-611 (no translation).

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