Measuring and testing – Vibration – By mechanical waves
Patent
1990-08-16
1991-06-18
Chapman, John E.
Measuring and testing
Vibration
By mechanical waves
73642, 73644, G01N 924
Patent
active
050240927
ABSTRACT:
A device is disclosed which allows an object to be tuned to an incoming sound wave magnitude and wavelength, such that the sound wave will alternatively be passed therethrough without detectable reflection or be completely reflected. The apparatus is intended to be mounted within a hollow object and adjust the perceived distance between the exterior walls of that object to mimic a single thick wall. A signal processing means is supplied which detects the sound wave magnitude and wavelength impinging on the wall facing the sound wave source. The wavelength is passed to the signal processing means, which transmits a complimentary signal to the second wall of the hollow object. The complimentary signal allows the hollow object to resonate as a whole as if it were a solid of a thickness much different from its actual thickness, allowing the sound wave to pass undisturbed therethrough or be reflected therefrom.
REFERENCES:
patent: 4590803 (1986-05-01), Harrold
Harrold and Sanjana, Acoustic Waveguide Sensors for Smart Structures and Skins, Fiber Optic Smart Structures and Skins II, Society of Photo Optical Instrumentation Engineers Proceedings Series, vol. 1170, pp. 462-471 (1989).
Urick, Principles of Underwater Sound, McGraw Hill, pp. 289-293.
Pollard, Sound Waves in Solids, Pion Limited, Chapter 4, (1977).
Harrold, Acoustical Technology Applications in Electrical Insulation and Dielectrics, IEEE Transactions on Electrical Insulation, vol. EI-20, No. 1 (Feb. 1985).
Harrold Ronald T.
Sanjana Zal N.
Chapman John E.
Francos William
Schron D.
Westinghouse Electric Corp.
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