Noise Characteristics of Bragg Imaging

  • Roy A. Smith
  • Glen Wade


The effect of Brillouin scattering on the image quality of a Bragg-imaging system is analyzed in this chapter. The particular Bragg-imaging system considered here uses a cylindrically convergent illuminating light beam. The signal-to-noise ratio for an image element (that is, a resolution cell) is shown to vary with the image-plane location when the image sensor is broadband in temporal frequency. It is also shown that quantum noise due to light scattered from thermal phonons (Brillouin scattering) is the dominant limiting source of noise for a Bragg-imaging system operating in the ultrasonic band at room temperature when the best available TV camera tube is used for detecting the image. Competing noise sources which are evaluated include quantum noise due to signal photons and image sensor noise. The effects of dust particles and other inhomogeneities on scattered light are not considered.


Quantum Noise Sound Field Noise Characteristic Sound Intensity Resolution Cell 
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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • Roy A. Smith
    • 1
  • Glen Wade
    • 1
  1. 1.Department of Electrical EngineeringUniversity of CaliforniaSanta BarbaraUSA

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