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Pulse compression acoustic microscopy at 750 MHz

Pulse compression acoustic microscopy at 750 MHz

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A pulse compression acoustic microscope working at a centre frequency of 750 MHz is reported. The pulse expansion and compression is achieved by SAW dispersive delay lines. The transmitted chirp has a bandwidth of 150 MHz and a dispersion of 1 MHz/ns. A processing gain in excess of 10 dB has been achieved.

References

    1. 1)
      • Y. Guangqi , M. Nikoonahad , E.A. Ash . Pulse compression subsurface acoustic microscopy. Electron. Lett. , 767 - 769
    2. 2)
      • M. Nikoonahad , G.Q. Yue , E.A. Ash . Subsurface broadband acoustic microscopy of solids using reduced aperture lenses, Review of Progress in Quantitive NDE.
    3. 3)
      • Yue, G.Q., Nikoonahad, M., Ash, E.A.: `Subsurface acoustic microscopy using pulse compression techniques', Proc. IEEE Ultrasonics Symposium, 1982, p. 935–938.
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