Abstract
A 1.1 GHz acoustic microscope is being developed with an anticipated resolution capability of 5 μm. The microscope uses a unique scanning method which employs the photoconductive effect to locally switch a CdS piezoelectric transducer. A focused laser beam scanned across the CdS transducer sequentially deactivates resolution elements and generates the video signal. To form the image, the video signal intensity modulates a CRT display which is scanned synchronously with the laser beam.
The present system has resolved a metal grid of 50 μm wires on 275 μm centers at a 20 second frame time. Both phase and amplitude information are used to generate the video signal in the present system. However, a phase discrimination system is being developed to separate phase and amplitude information.
Signal and noise considerations are presented and compared to other imaging techniques. Problems with spurious signals, optical scattering, acoustic interference, and signal uniformity have been encountered and are discussed with proposed solutions.
This work has been supported by The John A. Hartford Foundation, Inc.
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© 1972 Plenum Press, New York
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Auld, B.A., Gilbert, R.J., Hyllested, K., Roberts, C.G., Webb, D.C. (1972). A 1.1 GHz Scanned Acoustic Microscope. In: Wade, G. (eds) Acoustical Holography. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8213-7_5
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DOI: https://doi.org/10.1007/978-1-4615-8213-7_5
Publisher Name: Springer, Boston, MA
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