Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1997-04-09
1998-05-05
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
356356, 356358, 73657, H04R 2300, G01B 1102
Patent
active
057485640
ABSTRACT:
An acousto-optical vibration sensor, particularly for use in ultrasonic array transducers, such as for medical ultrasound, employs interferometric techniques. A receiver element has a light input port which receives laser light that exits via an output port only after undergoing a multitude of reflections between a static reflecting surface and a vibrating reflecting surface in a manner that enhances frequency-shifted light wave components. The receiver element includes a volumetric region including a layer of material which is both light transmissive and light scattering. In principle, ultrasonically shifted light wave components are enhanced by about six orders of magnitude, and vibration amplitudes significantly smaller than 0.01 A may be detected. Loss resulting from multiple reflections is compensated for by employing active lasing particles, sized so that lasing is induced by the frequency-shifted light.
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patent: 5497233 (1996-03-01), Meyer
patent: 5572323 (1996-11-01), Maeda et al.
Jean-Pierre Monchalin, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. UFFC-33, No. 5, Sep. 1986.
Eldred J. Woodrow
General Electric Company
Snyder Marvin
Stoner Douglas E.
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