Monochromatic ultrasonic transducer

Details Monochromatic ultrasonic transducer Monochromatic ultrasonic transducer

1992-10-22

1994-10-04

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73644, 73632, 310336, G01N 2900

Patent

active

053515463

ABSTRACT:
A transducer for generating or detecting ultrasonic energy of very narrow bandwidth which closely approximates a monochromatic source or detector has a gas gap of uniform dimensional width. The transducer employs standing ultrasonic waves generated, by multiple reflections and constructive interference, within the gap, effectively acting as a filter to pass only ultrasonic waves having a predetermined resonant frequency in response to impingement of broadband ultrasonic energy. This filtering effect enables the transducer to act as a source or detector of monochromatic ultrasound.

REFERENCES:
patent: 3913386 (1975-10-01), Saglio
patent: 4020679 (1977-05-01), Barry
patent: 4366406 (1982-12-01), Smith et al.
patent: 4870972 (1989-10-01), Maerfeld et al.
patent: 4976150 (1990-12-01), Deka
J. & H. Krautkramer, Ultrasonic Testing of Materials, 4th Ed., Springer-Verlag (1990), pp. 18-23.
G. A. Georgiou et al., "The Application of the Geometrical Theory of Diffraction to Modelling Pulsed Ultrasonic Inspection: A System Model", Br. J. of NDT, vol. 31, No. 10, Oct. (1989), pp. 551-561.

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