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On the use of sympathetic resonators to improve low-frequency underwater transducer performance

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Author
Baker, Steven R.
Ellsworth, John Merle
Date
1991-10
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Abstract
The achievable gain in the radiation resistance and directivity of a low-frequency underwater transducer due to the presence of an array of sympathetic resonators has been analyzed. The resonators were all taken to be air bubbles, and both the resonators and transducer were taken to be compact (ka << 1). The resonators were taken to be equally spaced around a circle of radius R, with the transducer located on the axis. The gain was calculated for various numbers of resonators as a function of ka(resonator), ka(transducer) and kR, for the transducer in the plane of the resonators and out of the plane a distance of one-quarter wavelength. For the transducer in the plane, a gain in radiation resistance of approximately two is possible with six or more resonators. For the transducer out of the plane, it is shown that a front-to-back discrimination of approximately 8 dB can be achieved, at the expense of a decrease of approximately ten percent in the achievable gain in the radiation resistance, compared to the transducer in the plane of the resonators
URI
https://hdl.handle.net/10945/30055
NPS Report Number
NPS-PH-92-002
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  • All Technical Reports Collection
  • Physics (NPS-PH)

Related items

Showing items related by title, author, creator and subject.

  • Thumbnail

    On the use of sympathetic resonators to improve low frequency transducer performance 

    Ellsworth, John Merle (Monterey, California: Naval Postgraduate School, 1990-09);
    The achievable gain in the radiation resistance and directivity of a low frequency underwater transducer due to the presence of an array of sympathetic resonators was analyzed. The resonators were all taken to be air ...
  • Thumbnail

    Continued investigation of the use of passive resonators to improve the performance of a low frequency sonar transducer. 

    Sanders, David E. (Monterey, California. Naval Postgraduate School, 1991-12);
    In an earlier thesis, Ellsworth showed that the radiated power output (quantified by the gain in radiation resistance presented to the transducer) and directivity of a compact underwater transducer can be significantly ...
  • Thumbnail

    Reciprocity calibration of an underwater transducer using the Delta-Z Method. 

    Bedard, Raynald (Monterey, California: U.S. Naval Postgraduate School, 1987);
    a method for determining the free-field open circuit voltage sensitivity of a reversible underwater electroacoustic transducer from the difference in its input electrical impedance when loaded by water and air was investigated ...
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