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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater wave receiver, and in particular, when mounted on a ship or the like, it is possible to
reduce the wave receiving sensitivity in the direction of arrival of own ship noise to improve the
wave receiving system. [Background of the invention] As described in Japanese Utility Model
Application Publication No. 57-160297 and Japanese Patent Application Publication No. 5491216, a conventional wave receiver is made of a piezoelectric ceramic vibrator made of a
rubber material or the like. The mold was applied and watertight coating was performed.
However, this rubber material and the like is intended to be a watertight seal, and the sound
speed of the material such as the rubber material and the like is not selected for directivity
control. Therefore, there has been a drawback that disturbance noise such as a rigid leu sound
can not be avoided as it travels through the sea from an angle overflowing the ship. [Object of the
Invention] The object of the present invention is to provide an underwater wave receiver
particularly installed on a ship or the like, including a wave receiver 'ff: installed in a recess
provided on a ship side, and molding or the like on the surface of the wave receiver. It is an
object of the present invention to provide a receiver for selecting the sound velocity of the
material to be applied, totally reflecting the sound incident from the surface vicinity, making it
directional, and reducing the self-carrier noise. [Summary of the invention] In order to achieve
the above object, when the wave receiver is installed on a wall surface of a hull or the like to
receive an underwater sound wave, the recessed portion is formed on the wall surface of the hull
or the like corresponding to the surface of the wave receiver. The sound insulation member and
the wave receiver are provided in the recess, the sound transmission layer is provided on the side
of the medium, and the total reflection critical angle is set according to the relationship between
the sound speed Ct of the sound transmission layer and the sound speed C0 of the medium. The
incident from a medium on a material (2) of sound speed at, which is generally placed in a
medium of sound speed C6, K sin at -C, / Ct- -----------------------------------------------------------------------------------------11- Therefore, at this time, the sound wave is not incident into the material. Based on
such a principle, the sensitivity of the noise arrival direction is reduced by providing directivity to
the single receiver by controlling the incident angle. Hereinafter, an embodiment of the present
invention will be described in detail with reference to FIG. 1 and FIG. In Fig. 1, for example, when
a sound insulation unit (panful) # 2 is provided on the outer wall 1 of the hull and the wave
receiver 3 is installed, the directivity characteristic of the wave receiving '/ S3 at that time is line
segment 4 It is almost omnidirectional as shown in. That is, if the size of the wave receiver 30 is
smaller than the wavelength of the underwater sound wave, the sensitivity of the wave receiver
becomes substantially constant until the normal direction of the wave receiver 50 is 0 ░ until it
contacts the buckle.
As shown in FIG. 2, the outer wall 11 of the hull is formed as a recess, and the sound insulation
member 1 person receiver 13 is installed, and the sound transmission layer 15 is installed on the
outer surface thereof. 1s ? ? At this time, assuming that the sound velocity C0 of the medium
and the sound velocity at of the sound transmission layer are as described above, there is a
relationship as shown in the above equation (1), and the incident sound wave 17 has a critical
angle IS ? ? angle If it is larger, it will be totally reflected on the surface of the sound
transmission layer winter. If the incident sound wave is at an angle of 160, the sound wave is
transmitted, and it has directivity characteristics as shown by a line segment according to the
incident angle. In the absence of multiple reflection interference, since the equation (1) is
independent of frequency, the critical angle is determined by the speed of sound of the sound
transmission layer. From this point of view, by selecting the material of the sound transmission
layer, if the wave receiver group with the structure shown in Fig. 2 is installed on the hull, it
would be possible to make a screen etc. It is possible to reduce the sensitivity of the receiver in
the direction of arrival of the interfering sound. [Effects of the Invention] As described above,
according to the present invention, even if individual receivers are arranged to have such
characteristics and arranged in an array, the individual receivers can be phased and multibeamed. Since the receive beam has the maximum sensitivity on the line segment locus, it has
low sensitivity to the direction of noise 1 (corresponding to the sound ray 17 in Figure 2), and
the signal-to-noise ratio or SIN There is an effect that can be improved.
Brief description of the drawings
Fig. 1 is a schematic diagram of a receiver installed on a hard baffle and an explanatory view
showing the directivity thereof. Fig. 2 is a receiver showing one embodiment of a receiver
configuration to which the present invention is applied. It is explanatory drawing of a structure.
111 иии Hull tAj! -2 ... Baffle material-3, 13 ... ## group-12 ... Sound insulation member, 4.14 ... Line
segment for explaining directional line, 15 ... Sound transmission layer, 16.17 ииииииииииииииииии Critical
angle. , ':;, That \ 1.11.1 j-l)
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