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FIG. H-12. Piezoelectric hydrophones. (a) A piezoelectric disk generates a voltage across opposite faces when bent. (b) Acceleration-canceling feature of the disc hydrophone. (c) Bender geophone. (d) Cylindrical hydrophone.[1]
  1. Sheriff, R. E; Geldart, L. P (August 1995). Exploration Seismology, 2nd Ed. Cambridge Univ. Press. p. 224. ISBN 9780521468268.