Optimizing the monotone performance of electrodynamic drivers using tubular couplers
Robert D. Finch, P. W. Higgins · The Journal of the Acoustical Society of America · 1976
A theory is presented for the design of resonant cylindrical couplers to be used with electrodynamic transducers to produce intense monotone signales in air. It is shown that for a given transducer there are different couplers which maximize radiation efficiency, or maximize radiated power, or which produce ρc loading in a connecting tube. The latter coupler loads the transducer as if it were connected to an infinitely long tube of the same diameter as the connecting tube. Several commerical transducers are examined to determine their radiation performance characteristics when loaded by suitable couplers. It is concluded that transducers are available which, when properly loaded by a cylindrical coupler, are capable of meeting the radiation requirements for devices such as an acoustic detection and ranging system. For example, a 200 Welect-rated commerical transducer may be made to radiate approximately 100 Wacoust when connected to a correctly designed quarter-wavelength cylindrical coupler. Subject Classification: [43]85.40, [43]85.42.