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Effect of the Photoconductive Layer on the Resolution of Opto-Acoustic Transducers

  • Behzad Noorbehseht
  • Glen Wade
  • Carl Schueler
Part of the Acoustical Imaging book series (ACIM, volume 10)

Abstract

Resolution of opto-acoustic transducers (OAT’s) may be determined using linear systems theory. An OAT is treated as a linear spatial system. Each of its constituent layers is regarded as a subsystem characterized by a unique spatial transfer function. In a previous paper we have shown that the resolution of OATs is determined, to a very good approximation, by the transfer function of the piezoelectric layer alone. In this paper we show that the transfer function of the piezoelectric layer is affected by the presence of the photoconductive backing layer in such a way as to lower the resonant frequency of the OAT. We show also that the normalized resolution, the resolution measured in wavelengths at the operating frequency of the device, is affected if the OAT is operated off resonance. The normalized resolution increases for frequencies below the resonant frequency and decreases for frequencies above resonance.

Keywords

Transfer Function Resonant Frequency Spatial Frequency Piezoelectric Material Piezoelectric Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    B. Noorbehesht and G. Wade, “Spatial Frequency Characteris- tics of Opto-Acoustic Transducers,” Acoustical Imaging, Vol. 9, K. Wang Ed., Plenum Press, New York, 1980.CrossRefGoogle Scholar
  2. 2.
    B. Noorbehesht and G. Wade, “Resolution of Opto-Acoustic Transducers,” IEEE Trans. Sonics and Ultrasonics, 1980. ( Submitted).Google Scholar
  3. 3.
    B. Noorbehesht, G. Flesher, and G. Wade,“ Spatial Response of Arbitrarily Electroded Piezoelectric Plates by Plane-Wave Decomposition,” Ultrasonic Imaging, Vol. 2, No. 2, 1980.Google Scholar
  4. 4.
    J.W. Goodman, Introduction to Fourier Optics, McGraw-Hill, New York, pp. 50–51, 1968.Google Scholar
  5. 5.
    M. Ahmed, “The Response of Piezoelectric Face Plates Used in Ultrasonic Imaging Systems,” IEEE Trans. Sonics and Ultrasonics, SU-25, No. 6, pp. 330–339, November 1978.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • Behzad Noorbehseht
    • 1
  • Glen Wade
    • 1
  • Carl Schueler
    • 1
  1. 1.Department of Electrical & Computer EngineeringUniversity of CaliforniaSanta BarbaraUSA

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