JPH02226090A - System for measuring submarine electrical wave - Google Patents

Abstract

PURPOSE:To enable long-term observation as well as obtain real time data by a method wherein weak electric waves originated in crustal alteration is received by a submarine antenna line, the received signal is amplified, the amplified signal is converted into an analog or digital signal and the signal is transmitted to a land data processor via a signal transmission line. CONSTITUTION:With a combination of an electric wave receiving amplifier and a converting transmitter installed in a console 11 having submarine cables 1 on both ends as a unit, several units which are sequentially connected as the need arises are placed on the sea bottom 14 as a submarine cable-like measurement device 20. Weak electric waves 15 received by an antenna line 4 is amplified, and after they are converted into an analog or digital signal the signal is transmitted to a data processor 17 inside a land terminal room 16 via a signal transmission line 5. Also from the land terminal room 16 electric power is constantly supplied to the respective devices in the console 11 by a power supply line 6. This allows long-term observation to be performed as well as data to be obtained in real time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a measurement system for weak radio waves generated due to crustal deformation within the earth (especially earthquakes, etc.), and in particular to a measurement system for measuring weak radio waves that occur over a long period of time on the ocean floor. This article relates to a submarine radio measurement system for performing accuracy measurements.

[Conventional technology]

Conventionally, this type of submarine radio measurement system has a method (data capsule method) in which a self-levitating measuring device is combined with a gooball-shaped antenna, is lowered to the seabed, and after measurement is completed, the measuring device is returned to the ship and data is processed. There is also a method in which an antenna is laid on the seabed from a ship and connected to a measuring instrument placed on the ship.

[Problem to be solved by the invention]

Crustal deformation (microearthquakes, etc.), which is the main cause of weak radio waves generated inside the Earth, has a steady and random probability of occurrence, so long-term observations must be conducted to catch weak radio waves. Must be.

However, the conventional submarine radio wave measurement system described above uses a data capsule method in which power is supplied to the measurement device using a battery, and measurement is carried out while the ship is stationary at sea. The drawback is that long-term stationary observations are not possible due to the impossibility of repowering the vessel and the technical difficulties of long-term stationary observations.

An object of the present invention is to provide a submarine radio wave measurement system that enables long M observation and obtains data in real time.

(Means for solving yAllll) The submarine radio wave measurement system of the present invention includes a casing in which a radio wave receiving amplifier and a conversion/transmission device are housed;
A submarine cable provided at both ends of the casing and having an antenna line connected to the radio wave reception amplifier, a signal transmission line connected to the conversion and transmission device, and a power supply line that feeds power to the radio wave reception amplifier and conversion and transmission device. is one unit,
It is equipped with a submarine cable-like measuring device formed by connecting one or more of the above-mentioned units in succession, and a data processing device connected to one end of the submarine cable-like measuring device and installed on the ground. The antenna line receives weak radio waves generated due to It is characterized in that it is transmitted to a data processing device.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a view from above of the installed state of the submarine radio wave measurement system of this embodiment, and FIG. 2 is a view from the side. The submarine radio wave measurement system is comprised of a submarine cable-shaped measuring instrument 20 laid on the ocean floor and a data processing device 17 installed on land.

The structure of the submarine cable-like measuring device 20 will be explained with reference to FIGS. 3 to 5. The submarine cable-like measuring instrument 20 includes a housing 11 and submarine cables 1 provided at both ends of the housing as one unit. The submarine cable 1 is composed of an antenna wire 4, a signal transmission line 5, and a power feed line 6 housed therein, and a radio wave reception amplifier 12 and a conversion/transmission device I3 are housed in a housing 11. The antenna line 4 is connected to a radio wave receiving amplifier 12, and the signal transmission line 5 is connected to a conversion transmission device 13.

The radio wave reception amplifier 12 amplifies the weak radio waves received by the antenna line 4, and the conversion and transmission device 13 converts the amplified signal into an analog or digital signal and sends it to the signal transmission line 5. The power supply line 6 supplies necessary power to the radio wave receiving amplifier 12 and the conversion/transmission device 13 .

The submarine cable 1 is a coaxial cable 2 as shown in FIG.
Alternatively, it can be configured using an optical fiber cable 3 as shown in FIG. will be established. In addition, optical fiber cable 3
In this case, the optical fiber 8 is used as a signal transmission line, the inner vibe 10 is used as a power feeding line, and an antenna line 4 is provided separately.

Furthermore, for the housing 11, a receptacle similar to that used in ordinary submarine repeaters can be used.

As described above, the casing 11 has the submarine cable l at both ends.
Radio wave reception amplifier 12 and conversion transmission device 13 housed within
is one unit, and if necessary, several units are connected consecutively as a submarine cable-like measuring instrument 20.
As shown in FIG. 2, the cable is laid on the seabed surface 14. Note that the length of the submarine cable 1 is arbitrary, but since the frequency band of the generated weak radio waves 15 is about several 1011 Hz to several 100 kHz, the length is about 1 to 100 m. Furthermore, when several units are connected in succession, signal transmission lines and feeder lines are connected to each other, but antenna lines are not connected to each other.

One end of such a submarine cable-like measuring device 20 is pulled up onto land and drawn into a land terminal station room 16 installed on land. The signal transmission line 5 and the power supply line 6 are connected to a data processing device 17 provided within the land terminal station room.

In the submarine radio wave measurement system configured as described above, the weak radio waves 15 received by the antenna line 4 are amplified into signals within the measurement band by the radio wave reception amplifier 12, and converted into analog or digital signals by the conversion and transmission device 13. The data is transmitted via the signal transmission line 5 to the data processing device 17 installed in the land terminal office room 16.

Since the resistivity of the seawater 18 is considerably lower than that of the earth's crust 19, noise generated on land hardly reaches the seafloor 14. Therefore, the measurement S/N ratio is very good (
, the received weak radio waves 15 can be clearly recognized by the data processing device 17.

In addition, the power supply line 6 connects the land terminal office room 16 to the housing 1 at all times.
Since power is supplied to each device within 1, continuous observation over a long period of time is possible.

Furthermore, when installing the submarine radio wave measurement system on the seabed surface 14, as shown in FIG.
By laying them so that they are perpendicular to each other, it is possible to improve the ability to detect weak radio waves propagated from any direction.

〔Effect of the invention〕

As explained above, according to the present invention, there is an effect that continuous observation can be carried out for a long period of time by supplying power from the land terminal room. Additionally, the observed data can be obtained and processed in real time. Furthermore, submarine cable length (antenna length)
can be set arbitrarily, which has the effect of reliably catching weak radio waves.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an embodiment of the present invention, Figure 3 is a diagram showing a submarine cable and a housing, Figure 4 is a diagram showing a submarine cable whose base is a coaxial cable, and Figure 5 is a diagram showing an example of the present invention. 1 is a diagram showing a submarine cable based on an optical fiber cable. 1... Submarine cable 2... Coaxial cable 3... Optical fiber cable 4 ・ 5 ・ 6 ・ 7 ・ 8 ・ 9 ・ 10 ・ 11 ・ 12 ・ 13 ・ 14 ・ 15 ・ 1G・ 17・ 18・ 19・ 20・ Antenna line Signal transmission line Feed line Center conductor Optical fiber External conductor Inner vibe housing Radio wave receiving amplifier Conversion transmission device Seabed surface weak radio wave Land end office room Data processing device Seawater crust Submarine cable shaped measuring instrument

Claims (1)

[Claims] (1) A casing containing a radio wave receiving amplifier and a conversion/transmission device, an antenna line provided at both ends of the casing and connected to the radio wave receiving amplifier, and a signal transmission line connected to the conversion/transmission device. , a submarine cable having a feeder line for feeding power to the radio wave receiving amplifier and the conversion/transmission device as one unit, and a submarine cable-like measuring device comprising one or more of the units connected continuously; and this submarine cable-like measuring device. and a data processing device connected to one end and provided on the ground, the antenna wire receives weak radio waves generated due to crustal deformation, and the received signal is amplified by the radio wave receiving amplifier. A submarine radio wave measurement system that converts a signal into an analog or digital signal using the conversion transmission device and transmits the signal to the data processing device via the signal transmission line.