JPS62126383A - System for recording underwater sound - Google Patents

Abstract

PURPOSE:To reduce the memory capacity of a recording apparatus and to facilitate analytical processing, by starting the recording apparatus when a seismometer detects the wave propagating through the ground from an oscillation source as an initial shock to record underwater sound propagating through water. CONSTITUTION:An underwater wound wave 4 advancing through seawater at a propagation speed of 1.5km/s and an elastic wave 3 advancing through the crust at a propagation speed 3-8km/s respectively reach an observation point 2 from an oscillation source 1 in seawater of volcanic activity, an earthquake or blasting. A seismometer 6 responds to the elastic wave 3 and an acoustoelectric converter element 5 responds to the underwater sonic wave. Because the elastic wave 3 reaches the seismometer 6 first of all because of the difference between the propagation speeds, said elastic wave 3 is inputted to a detector 7 to perform judgement and, in the case of objective information, a start signal is sent to the start control part 9 of a recording apparatus 10 to start said recording apparatus 10 and the underwater sonic wave 4 sensed by the acoustoelectric converter element 5 is recorded on the recording apparatus 10 from a signal input part 8.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for recording underwater sound waves emitted from volcanic activity, earthquakes, explosions, etc. under the sea, and in particular, to economical storage capacity,
Concerning an underwater sound recording method that improves the efficiency of analysis processing.

[Conventional technology]

Conventionally, this type of recording method has been a continuous recording method.

(Problem to be solved by the invention J) The conventional continuous recording method described above requires a large amount of storage capacity because it records a lot of information that is not targeted in addition to the targeted information. The disadvantage is that the processing becomes complicated.

1) The underwater sound recording method of the present invention is based on the fact that the velocity of elastic waves propagating through the ground is faster than the propagation of underwater sound waves (Marukubi Publishing, 1932).
0th Edition Science Chronology P487 - P490, P717) It has an acoustoelectric element that is sensitive to underwater sound waves and a seismometer that is sensitive to ground vibrations, and by installing it on the ocean floor, the oscillation source propagates through the earth. When the seismometer detects an initial movement, it generates a start signal and starts the recording device, recording underwater sounds propagating through the water.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

1 and 2 show an embodiment of the present invention on the seabed. Transmission speed 1 from oscillation source 1 such as volcanic activity, earthquake, explosion, etc.
．． An underwater sound wave 4 that travels through the ocean at a speed of 5 kn+/s and an elastic wave 3 that travels through the earth's crust at a propagation speed of 3 to 8 km/s each arrive at an observation point 2. Referring to FIG. 1, the seismometer 6 is sensitive to elastic waves 3, and the acoustoelectric transducer 5 is sensitive to underwater sound waves 4. Here, due to the difference in propagation speed, elastic waves 3
reaches the seismograph 6 first, so it is input to the detector 7 and judged, and if the information is targeted, it is sent to the recording device 10.
A start signal is sent to the start control section 9 of the controller 9 to start the recording device 10, and the underwater sound waves 4 sensed by the acoustoelectric transducer 5 are recorded from the signal input section 8 to the recorder 10.

〔Effect of the invention〕

As described above, the present invention has the advantage that by recording target information, the storage capacity of the recording device can be reduced and analysis processing can be facilitated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the underwater sound recording method shown in FIG.

Claims (1)

[Claims] an acousto-electric transducer that is sensitive to underwater sound waves; a seismometer that is sensitive to vibrations on the ocean floor; a detector that detects waves that are transmitted through the earth and is sensed by the seismometer as an initial motion and issues an activation signal; An underwater sound recording method comprising: a recording device that is started by a start signal and records the underwater sound waves.