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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the use of a towed
submarine search cable, FIG. 2 is a partial perspective view of one embodiment of the present
invention, and FIG. 3 is a strength member nylon rope The specific gravity comparison figure of
the cable and the cable made into the steel cord, FIG. 4 is an arrangement ¦ positioning figure of
the wave transmitter and the hypirophone in this invention cable. 5 · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · jacket tube, 10.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the construction
of a sea + 5 in-search cable with lightweight flexible strength members. The underwater search
cable usually has a large number of hydrophones attached to one to several strength members at
a predetermined distance, and this, together with the hydrophone wires, pre-amplifiers, buoyancy
materials, etc. g. (L down, housed in-"La /" ○ Zm rows, when the whole is filled with oil to the
remainder space has a structure holding the same specific gravity as the sea, towing this, Figure
1 As shown in the drawing, the tow cable 2 connected to the front end of the underwater
searching cable 1 and the dog 5 connected to the rear end are pulled back and forth to be
expanded in water with a buoyant neutral state. 4 is a towing vessel. Since the tensile strength
company is quite large, steel cords are generally used as the strength members of conventional
underwater search cables. However, since the strength members of the steel 10 cords are heavy,
the amount of the buoyancy material and the amount of the filling oil required to achieve the
buoyancy neutrality become large and the diameter of the jacket tube increases, which is
inconvenient for handling. At the same time, the vibration generated in the tow cable 2 and the
drogue 5 has a disadvantage that the hydrophone 4 is disturbed by the steel cords. The i
proposal aims to propose a conventional cable for underwater search that eliminates the abovementioned drawbacks. A description will be given of the embodiment shown in FIG. 2 below. A
cable for searching undersea according to the present invention (hereinafter simply referred to
as cable and 2- (2) z '). (3) in the center holes of a large number of hollow cylindrical shells 75
arranged at a predetermined distance d, 1) a hydrophone 5 or a strength member 6 consisting of
a lightweight flexible rope made of synthetic resin such as nylon, polypropylene or polyethylene.
The bundle of electric wires 8 for the preamplifier 7 is passed through and covered with a jacket
tube 9, and the tube is filled with the required buoyancy material and oil. The strength member 6
has advantages such as a buoyancy material required to have a specific gravity of about 1 and a
buoyancy neutrality, a small amount of oil, and a small amount of oil so that the inner diameter
of the jacket tube 9 becomes small and handling becomes easy. In addition, there is an advantage
that the vibration from the tow cable 2 or the draw 5 is not transmitted to the hydrophone 5 due
to the flexibility of the strength member 6. FIG. 5 is a specific gravity comparison diagram of a
cable in which the strength member 86 is made into a nylon lobe and a cable made into a steel
cord, and it is understood that the cable diameter can be reduced by 7 to 8 according to the
present invention. In the case of the proposed cable, the jacket tube 9 also bears the cable
tension together with the strength 鵞 O (3) · input-4 and the member 6, but the tension member
stretches more by tension during towing than the cable whose steel member is a strength
member. As a result, the distance d between the node phones 50 increases.
If this amount of increase is not known, it causes an error in the signal processor, and the tension
changes irregularly due to the drogue. Therefore, in the present invention, as shown in FIG. 4, a
transmitter 10 is provided at one end of the strength member 6, and a pulse sound is emitted
from time to time every second to make each idrophone 5 receive it. Is detected 10 to correct the
error of the signal processor. According to this correction method, since the interval d can be
immediately detected each time it is necessary, it is possible to make a difference correction
corresponding to a change in the elongation of the strength member. The present invention has
the above-described configuration, and has the effect of reducing the size of the entire cable by 1
m and making it easy to handle, and not transmitting the vibration generated in the tow cable or
the draw to the vehicle. The proposed scheme is also effective for towing cables and for
temporary, suspended, and self-propelled underwater search cables. t。 (4) Ke-Ku 2 '