JPH0422819A - Seabottom observation device - Google Patents

Abstract

PURPOSE:To construct a seabottom observation system for plural points on a seabottom with a pair of submarine optical fiber cables by housing an optical fiber input/output line, a sensor, and every kind of circuit in a pressure proof cabinet. CONSTITUTION:The pressure proof cabinet 1 houses the sensor 2, an electrical/ optical conversion circuit 4, the optical fiber output line 5, the optical fiber input line 11, an optical/electrical conversion circuit 12, and a signal insertion circuit 13. The sensor 2 observes the seabottom, and outputs a measuring signal to the signal insertion circuit 13. Meanwhile, the optical/electrical conversion circuit 12, after converting an optical signal inputted via the optical fiber input line 11 to an electrical signal, outputs the electrical signal to the signal insertion circuit 13. Therefore, the signal insertion circuit 13 inserts a digital measuring signal outputted from the sensor 2 to the electrical signal inputted from the optical/electrical conversion circuit 12, and outputs the synthetic signal of them to the electrical/optical conversion circuit 4. The electrical/optical conversion circuit 4, after converting an inputted electrical signal to the optical signal, outputs it to the outside the pressure proof cabinet 1 via the optical fiber output line 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cable-type submarine observation device, and particularly to a submarine observation device that uses an optical fiber cable as the cable.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional ocean floor observation device.

In the figure, 1 is a pressure-resistant enclosure that protects the components and circuits housed inside from contact with seawater, 2 is a sensor that outputs measurement signals for seafloor observation, and 3 is this sensor 2.
an interface circuit that amplifies and encodes the output signal of
4 is an electrical/optical conversion circuit that converts an electrical signal into an optical signal; 5
is the original fiber output line that transmits the optical signal.

In addition, the above-mentioned pressure-resistant structure 1 is connected to the above-mentioned sensor 2° interface 3. It accommodates an electrical/optical conversion circuit 4 and an optical fiber output #J5.

Next, the operation of the seafloor observation device with the above configuration will be explained. First, the sensor 2 observes the ocean floor and outputs a measurement signal, which is then input to the electrical/optical conversion circuit 4 via the interface circuit 3. This electrical/optical conversion circuit 4 converts the input electrical signal into an optical signal.
It can be output to the outside via an optical fiber output line 5.

Figure 4 shows how to configure a seabed observation system using a plurality of seafloor observation devices shown in Figure 3. In the same figure, 6
6c td Seabed observation devices installed at different points on the seabed, the detailed configuration of which is shown in Figure 3. 7a to 7c are connected to the submarine observation devices 61 to 6C, respectively, and then submarine optical cables, 8 are installed on land. These receiving circuits 9 & - 9 C are connected to one ends of submarine cables 7 a - 7 C, respectively.

Next, the operation of the above ocean floor observation system will be explained. First, the sensors 2 of the plurality of seabed observation devices 6J1 to 6C installed at different points on the seabed observe the seabed at each point and output measurement signals. Each measurement signal is amplified and encoded by the interface circuit 3, and then converted into an optical signal by the electrical/optical converter 4. This optical signal f
i-source fiber output line 5 and submarine optical cable T&~7e
The receiving circuit 91 of the terminal device 8 installed on land via
It can be received at ~9C. For this reason, receiving circuit 9
A to 9C can convert optical signals into electrical signals and use them as measurement signals.

[Problem to be solved by the invention]

With conventional submarine observation devices, when building a system by installing them at multiple locations on the ocean floor, each submarine observation device must be connected to a submarine optical cable, and the cost of the submarine optical cable increases in proportion to the number of measurement points on the ocean floor. There was a drawback that costs associated with seabed installation increased.

[Means to solve the problem]

The seabed observation device of the present invention includes an optical fiber through line, an optical/electrical conversion circuit that converts an optical signal input from the outside via the original fiber input line into an electrical signal, and a system that observes the seafloor and outputs a measurement signal. A sensor, a signal insertion circuit that inserts the output signal of this sensor into the output signal of the optical-to-electric conversion circuit and outputs it, and converts the output signal of this signal insertion circuit into an optical signal and then outputs it via an optical fiber output line. It is equipped with an electrical/optical conversion circuit inside the pressure-resistant body that outputs the energy to the outside.

[For production]

This invention allows observations at multiple locations on the ocean floor to be established using a pair of submarine optical fiber cables.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a seabed observation device according to the present invention. In the figure, 10 is an optical fiber through line that introduces an optical signal into the pressure-resistant enclosure 1 and then outputs it to the outside, 11 is an optical fiber input line, and 12 is an optical fiber input line that is input through this optical fiber input line 11. An optical/electrical conversion circuit 13 converts an optical signal into an electrical signal, which digitally converts the measurement signal from the sensor 2, and inserts this digital measurement signal into the electrical signal output from the optical/electrical conversion circuit 12 to generate a composite signal. This is a signal insertion circuit for output.

In addition, the above-mentioned pressure-resistant structure 1 is connected to the above-mentioned sensor 2
Optical conversion circuit 4. Optical fiber output @5. Original fiber input line 11. It houses an optical/electrical conversion circuit 12 and a signal insertion circuit 13.

Next, the operation of the seafloor observation device with the above configuration will be explained. First, the sensor 2 observes the seabed and outputs the measurement signal to the signal insertion circuit 13.

On the other hand, the photoelectric conversion circuit 12 components 7 Iper human power, Ii! 1
After inputting the optical signal through 1, the optical signal is converted into an electrical signal.
It is output to the signal insertion circuit 13. To ensure this, the signal insertion circuit 13 inserts the digital measurement signal output from the TFI sensor 2 into the electrical signal input from the optical/electrical conversion circuit 12, and outputs the combined signal to the electrical/optical conversion circuit 4. This electrical/optical conversion circuit 4 converts the input electrical signal into an optical signal, and then sends it to the pressure-resistant body 1 via an optical fiber output @5.
can be output externally.

FIG. 2 is a diagram configuring a seabed observation system using a plurality of seafloor observation devices shown in FIG. 1. In the same figure, 1
4a to 14e are submarine observation devices installed at different points on the ocean floor, the detailed configuration of which is shown in FIG. , 16 is each submarine observation device 1
A submarine optical fiber line 17 connects the optical fiber output line 5 and the optical fiber input line 11 of Hatake 4 to 14e, and a submarine optical fiber 17 connects the optical fiber through line 10 of the submarine observation device 14 m and the optical fiber input line 11. line, 18 is PCM
The frame signal generating circuit 19 and the receiving circuit 20 are housed in the remote terminal station equipment 211 and 21b, which are installed on land and are connected between the terminal equipment 18 and the seabed observation device 14c, and are subsea source fibers.

Next, the operation of the seafloor observation system with the above configuration will be explained. First, the PCM frame signal output from the PCM frame signal generation circuit 19 of the terminal device 18 is the submarine optical goofle 21m submarine observation device 14eC+f fiber through line 10 - submarine optical fiber line 15 - submarine observation device 1
4b optical fiber through line 10 - submarine optical fiber line 15 - submarine observation device ft14m optical fiber through line 10 - submarine optical fiber line 1γ - submarine observation device 14m via original fiber input line 11 The signal is input to the optical/electrical conversion circuit 12. This optical-to-electrical conversion circuit 12 converts the optical signal into an electrical signal and outputs it to the signal insertion circuit 13. This signal insertion circuit 13 digitally converts the measurement signal from the sensor 2, and converts this digital measurement signal into an optical signal.
It is inserted into the electrical signal output from the electrical conversion circuit 12, and the combined signal is output to the electrical/optical conversion circuit 4. This electricity
The optical conversion circuit 4 converts this composite signal into an optical signal KyR, and then outputs it to the outside of the pressure-resistant enclosure 1 via an optical fiber output line 5. Similarly, sensor 2 of submarine observation device @14b
The signal insertion circuit 13 converts the measurement signals outputted from the submarine optical fiber line 16 and the measurement signals outputted from the sensor of the submarine observation device 14c into digital signals.
- Optical to electrical conversion circuit 12 via optical fiber input line 11
After being inputted to , it is converted by the optical-to-electrical conversion circuit 12 and inserted into the optical signal, and the combined signal is output to the electric-to-optical conversion circuit 4 . After converting the combined signal of the electrical/optical conversion circuit 4 into an optical signal, it is sent to the receiving circuit 20 of the terminal device 18 via the optical fiber output line 5 and the submarine optical cable line 21b. With this arrangement, the receiving circuit 20 can constantly transmit seafloor measurement data to land and use it by converting optical signals into electrical signals.

〔Effect of the invention〕

As explained above, the submarine observation device of this invention has a fiber through line inside the pressure-resistant body.

Optical/electrical conversion circuits, signal insertion circuits, sensors and
Since it has an optical conversion circuit, it is possible to construct an ocean floor observation system at multiple locations on the ocean floor using a pair of submarine optical fiber couples. Moreover, this pair of submarine optical fiber cables can be realized with a single submarine optical fiber cable, so even if the number of submarine observation devices increases, there is no need to install multiple cables, and the submarine installation work can be completed in a series of steps. Since this can be achieved by cable construction, it has the effect of making it possible to realize an extremely inexpensive submarine observation system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the seabed observation device according to the present invention, FIG. 2 is a diagram configuring a seabed observation system using a plurality of the seabed observation devices shown in FIG. 1, and FIG. FIG. 4 is a block diagram showing a conventional seabed observation device, and is a diagram configuring a seabed observation system using a plurality of the seafloor observation devices shown in FIG. 3. 1...Pressure-resistant body, 2...sensor, 4...
・Electrical/optical conversion circuit, 5...Optical fiber output line, 1
0... Optical fiber through line, 11... Optical fiber input line, 12... Optical/electric conversion circuit, 13...
...Signal insertion circuit, 14a-14c...Seafloor observation device, 15-1γ...Seafloor optical fiber line, 18...
... terminal equipment, 190.・, PCM frame signal generation circuit, 20・receiving circuit, 21 & and 21b...submarine optical fiber. Patent applicant: NEC Co., Ltd. NEC Nippon Yoh Engineering Co., Ltd. Agent: Masaki Yamano

Claims (1)

[Claims] An optical fiber through-line, an optical-to-electrical conversion circuit that converts an optical signal input from the outside via an optical fiber input line into an electrical signal, a sensor that observes the ocean floor and outputs a measurement signal, and the output signal of this sensor. a signal insertion circuit that inserts the signal into the output signal of the optical-to-electric conversion circuit and outputs the signal; and an electric-to-optical conversion circuit that converts the output signal of the signal insertion circuit into an optical signal and then outputs it to the outside via an optical fiber output line. An ocean floor observation device characterized by having a circuit inside a pressure-resistant body.