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Parametric transducer for high-speed real-time acoustic imaging

Parametric transducer for high-speed real-time acoustic imaging

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The letter reports the development of a novel high-speed scanning acoustic imaging system, potentially suitable for medical diagnosis, nondestructive testing and acoustic microscopy. The key element of this system is a parametric transducer, consisting of a photoconductor-piezoelectric sandwich in which the nonlinear behaviour is the basis of an optical-readout method. Preliminary measurements at 2.7 MHz have indicated that the sensitivity is better than 0.2 μW/cm2, and a resolution approaching the expected limiting value of 0.7 mm has been achieved.

References

    1. 1)
      • Roberts, C.G.: `Optically scanned acoustic imaging', 2361, ML Report, 1974.
    2. 2)
      • G. Wade . (1973) Recent developments in acoustic holography and imaging, CRC Critical Reviews in Solid State Sciences.
    3. 3)
      • Jones, H.W.: `Some aspects of ultrasonic imaging at frequencies of 1 to 100 MHz', Conference proceedings of Ultrasonics International, 1973, p. 257–264.
    4. 4)
      • R.A. Lemons , C.F. Quate . Acoustic microscope—scanning version. Appl. Phys. Lett. , 4
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