Dark Field Acoustic Microscope

  • I. R. Smith
  • D. A. Sinclair
Part of the Acoustical Imaging book series (ACIM, volume 10)


In a scanning acoustic microscope dark field imaging can be achieved by departing from collinearity in the arrangement of receiving and transmitting lenses. We have recently shown that one can also obtain dark field images in a collinear arrangement by replacing one lens with a plane wave transducer and by placing a stop in the centre of one of the lenses. The technique is however difficult to apply to high frequency instruments. In the present paper we report on an alternative configuration in which the transducer is formed on the front surface of the lens. An annular electrode pattern is used to excite the transducer. Disconnecting the central region achieves dark field conditions. More generally, by prescribing the amplitude of the signals applied to each distinct electrode in a multielement annular transducer, it is possible to vary the spatial frequency response of the instrument over wide limits. This enables one to adapt the performance of the instrument to the requirements set by specific objects. These techniques will be illustrated with reference to human tissue characterisation and the detection of cracks in metals.


Spatial Frequency Dark Field Dark Field Image Wire Array Acoustic Image 
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Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • I. R. Smith
    • 1
  • D. A. Sinclair
    • 1
  1. 1.Dept. of Electronic and Electrical EngineeringUniversity College LondonLondonUSA

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