JP2904096B2 - Submarine repeater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a submarine repeater,
In particular, it relates to the structure of a submarine repeater for ocean observation.

[0001]

2. Description of the Related Art Conventionally, a submarine repeater 5 for ocean observation has the structure shown in FIG. Cylindrical pressure vessel 1 of this repeater
A sensor for detecting vibrations of the sea floor due to an earthquake (hereinafter referred to as ground motion) and an electronic circuit for transmitting an output signal from the sensor are housed therein. A connection ring 2 for connecting to a submarine cable 8 is provided at both ends of the cylindrical pressure-resistant container 1, and a submarine cable retention part 3 is attached to the connection ring 2.

[0002]

The conventional submarine repeater for marine observation shown in FIG. 3 has a structure capable of withstanding high water pressure on the seabed. Has a cylindrical or conical outer shape. The entire repeater has a substantially streamlined outer shape.

[0003] However, when the submarine repeater for ocean observation is installed on the sea floor, fine vibrations are generated in the submarine repeater for ocean observation due to the tensile stress applied to the submarine cable due to the low laminar flow on the sea floor and the movement of the tide. Occurs. This vibration is a major factor that lowers the resolution of a sensor that detects minute ground motion.

It is an object of the present invention to provide a submarine repeater for ocean observation having a structure capable of preventing minute vibrations occurring in the submarine repeater due to external conditions and enabling a sensor to detect minute ground motion.

[0005]

According to the present invention, there is provided a cylindrical pressure vessel containing a sensor for detecting ground motion and an electronic circuit for transmitting the output of the sensor. It is a submarine repeater provided with a repeater installation block.

[0006] This block ensures that the submarine repeater is installed on the bottom of the sea, and reduces the external influence on the sensor.
It has the effect of improving detection performance. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a submarine repeater according to the present invention will be described with reference to FIGS. FIG. 1 is a side view of the submarine repeater, and FIG. 2 is a front view as viewed from the direction of the submarine cable.

First, a sensor for detecting minute ground motion and an electronic circuit for transmitting an output signal from the sensor are housed in a cylindrical pressure-resistant container 1 and sealed. The cylindrical pressure-resistant container 1 is provided with a connection ring 2 for connecting a submarine cable, and the connection ring 2 is provided with a submarine cable retention part 3.

The block 4 is attached to the outer periphery of the submarine repeater 5 for ocean observation constructed as described above. In this embodiment, the block 4 is composed of three parts for facilitating the assembly, and is integrally connected by bolts 7 on the outer periphery of the submarine repeater 5 for ocean observation, and is attached to the repeater 5. The block 4 integrally connected is configured such that three protruding portions are formed on the outer peripheral portion thereof.

Further, in this embodiment, the blocks 4 are mounted at two different positions on the outer peripheral portion of the submarine repeater 5 for ocean observation, and are connected to each other by the shaft 6 to facilitate assembly. Has become.

The submarine repeater 5 for ocean observation according to the present embodiment can be reliably and stably installed on the sea bottom by having the above-mentioned configuration, and the detection performance of the sensor can be enhanced.

In this embodiment, a sensor having a three-axis accelerometer and an A / D converter is used. The cylindrical pressure vessel 1 has a diameter of about 20 to 30 cm and a length of about 50 to 100 cm. Meter beryllium copper alloy. The blocks may be the same beryllium copper alloy,
Stainless steel can also be used.

The block 4 is not limited to a block composed of three parts, but may be composed of two parts or four or more parts. The block can be integrally formed by a mechanical method other than bolting or by bonding. Further, the number of protrusions formed on the outer peripheral portion of the block 4 is not limited to three, and may be more than three. Even one or two protruding portions are possible as long as the repeater can be stably installed on the sea floor. It is preferable that the block has a shape that is symmetrical with respect to the center axis of the container when mounted on the outer peripheral portion of the submarine repeater 5. This is effective for keeping the state of installation of each submarine repeater 5 on the sea bottom constant.

Although the block may be provided at a specific location on the outer peripheral portion of the submarine repeater 5 depending on its shape and size, it is desirable to provide the block at a plurality of locations on the outer peripheral portion for stable installation. . When installing in multiple places,
It is desirable to arrange the blocks having the same shape so as to overlap when viewed from the submarine cable.

The plurality of blocks may be connected to each other by a shaft.

[0015]

As described above, the submarine repeater of the present invention can be reliably and stably installed on the sea floor by providing the submarine repeater installation block on the outer peripheral portion thereof, and can be used for low-sea flow and tidal currents on the seabed. Can prevent the movement of the submarine cable and the subtle movement of the submarine repeater, improve the detection performance of the sensor installed in the repeater and detect the ground motion of the sensor, and obtain the effect of obtaining highly reliable observation data. Have.

[Brief description of the drawings]

FIG. 1 is a side view of a submarine repeater showing an embodiment of the present invention.

FIG. 2 is a front view of the submarine repeater according to the embodiment of the present invention as viewed from a submarine cable side.

FIG. 3 is a side view of a conventional submarine repeater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical pressure vessel 2 Connection ring 3 Submarine cable detention part 4 Block 5 Submarine repeater for ocean observation 6 Shaft 7 Bolt 8 Submarine cable

Claims (3)

(57) [Claims] 1. A submarine repeater which includes a housing with a cylindrical pressure vessel and an electronic circuit portion for transmitting the output of the sensor and the sensor for detecting the ground motion, seabed on the outer peripheral surface of a cylindrical pressure vessel
A block for installing a repeater is provided, and the block
Is composed of multiple parts and joined together to form a cylindrical pressure vessel.
A submarine repeater provided on an outer peripheral surface. 2. A blower provided on an outer peripheral surface of a cylindrical pressure vessel.
The container has a shape that is symmetrical about the central axis of the container.
The submarine repeater according to claim 1, wherein: 3. A block comprising a plurality of outer peripheral surfaces of a cylindrical pressure vessel.
The submarine relay according to claim 1, which is provided at a location.
vessel.