Measuring and testing – Vibration – By mechanical waves
Patent
1992-10-26
1995-07-25
Chilcot, Jr., Richard E.
Measuring and testing
Vibration
By mechanical waves
73632, G21C 1700
Patent
active
054351863
ABSTRACT:
An ultrasonic parametric amplifier incorporates a duct having rigid cylindrical wall with a periodic inner surface that undulates sinusoidally in an axial direction, and an element for heating the external surface of the wall. The sinusoidal undulations of the periodic inner surface have a wavelength which is about half of the wavelength of the waves of ultrasonic energy propagating through a fluid filling the duct. The waves are amplified by synergistic interactions of the ultrasonic waves with the periodic duct walls when heat is added in a predetermined manner, thereby compensating for the exponential decrease in fluid temperature which would otherwise lead to detuning of the amplifier.
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Karim-Panahi Khosrow
Terhune James H.
Biegel R.
Chilcot Jr. Richard E.
General Electric Company
McGinness James E.
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