油筒送波器の指向性利得

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書誌事項

タイトル別名
  • DirectionaI Gains of Oil-FilIed-Tube Endfire Ultrasound Transmitters
  • ユトウソウハキ ノ シコウセイ リトク

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説明

The directivity characteristics and the gains are computed for the oil-filled-tube underwater transmitter and compared with experiments. It is ascertained that Hansen-Woodyard's condition (Eq. (16)) giving the optimum Iength of dielectric-rod antenna is also valid for the oil-filled-tube transmitter. Theoretical values of the directional gain G_&ltd0&gt are obtained by numerical integration of Eq. (11) using a digital computer, substituting D_k(θ) from Eq. (8). In this equation, D_&lt1k&gt(θ) means the directivity characteristic of the tube-section according to Kirchhoff's formula (Eq. (6)) and D_2(θ) the directivity due to the endfire-arrangement (Eq-(5)). Computed values of G_d0 are shown in Fig. 4 (f=21. 5 kHz), Fig. 5 (f=24. 2 kHz) and Fig. 6 (f=33. 5 kHz). Fig. 10 shows the comparison between the theoretical and experimental values of G_&ltd0&gt. Although the measurements are somewhat lower than theoretical results, the location of the maxima are in good agreements, (G_&ltd0&gt)_max increasing ca. 9 dB by attaching the "oil-filled-tube". Fig. 15 shows the comparison between the theory and measurement for the optimumtube length (L_0). Although the experimental points are slightly higher than the calculation, the general agreement shows the applicabilty of Hansen-woodyard's condition. Also the electromechanical efficency η is measured for evaluating the over-all effect of the oil-filled-tube (see Fig. 16). The observed ca. 20% increase in η by attachment of the oil-tube indicates a further advantage of this arrangement.

収録刊行物

  • 日本音響学会誌

    日本音響学会誌 30 (8), 436-442, 1974

    一般社団法人 日本音響学会

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