JPS5837582A - Underwater magnetism detecting device - Google Patents

Abstract

PURPOSE:To improve the efficiency of divers work or the like by towing magnetism detectors with towing cables to carry detection quickly in the deep sea bottom and separating a target setting machine when an abnormal magnetic substance is detected to output a detecting signal. CONSTITUTION:A towboard 3 is floated on a sea area to be detected and a magnetism detector 1 and a target setting machine 4 are toward by a towing cable 2. If an abnormal magnetic substance exists in the sea bottom, the magnetism detector 1 detects the substance, the target setting machine 4 is separated by a discriminating signal outputted from a signal operation processing circuit and a sounding signal is outputted from a sounding body of the target setting machine 4. A controlling device 8 mounted on the towboard 3 records a position where the target setting machine 4 is set up. An abnormal magnetic substance recovering board searches the sound signal from the target setting machine 4 while referring the positional information for the target setting position received from the towboard 3, the abnormal magnetic substance can be easily recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater magnetic exploration device that searches for magnetic abnormal objects such as mines on the ocean floor.

Magnetic detectors have traditionally been used to search for explosives such as mines buried under the sea. However, in the conventional method of using a magnetic detector, the magnetic detector is attached to a pedestal-like structure, and the structure is suspended close to the ocean floor by operating a measurement vessel or a Schiller. Due to the above restrictions, the exploration width was limited to 10 meters or less, and the depth that could be explored was limited to 15 to 20 meters at most. Also, due to the use of a frame-like structure, the towing speed could not be increased much.

Therefore, it has been almost impossible to accurately survey a wide area of water in a short time, regardless of its depth.

It is an object of the present invention to provide an underwater magnetic surveying device that eliminates the drawbacks of the conventional devices and is capable of surveying a wide area at high speed and with high precision regardless of the depth.

In order to achieve the above object, the underwater magnetic detection device of the present invention connects a magnetic detector and a marking device using a towing device and tows the device, detects the position and depth of the magnetic detector with a sonar, and furthermore, A control device installed on the ship receives signals from the magnetic detector and sonar to determine the presence or absence of a magnetically abnormal object, and if a magnetically abnormal object is present, controls the target vehicle to be separated from the magnetic detector. .

The present invention will be explained in detail below with reference to an embodiment shown in one drawing.

FIG. 1 is a schematic diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a magnetic detector, which is towed far away from the hull of the towing device 5 through the sea by a towing cape/v2. Reference numeral 4 is a marking device that is connected to the magnetic detector 1 and towed. When an abnormal magnetic object is detected, the magnetic detector 1 is disconnected on the spot, and a pin is ejected from the built-in sounding body. Let's do it.

Power is supplied to the magnetic detector 1 and the target device 4 through the towing cable 2.
It is connected to the towing vessel 6 through an electric power cable built into the vessel. Further, 5 is an acoustic sonar, which is attached to the float 6 and towed by a sonar towing cable 7. acoustic sona 5
is located on the water surface almost above the magnetic detector 1, and transmits sound waves to accurately detect the position and depth of the magnetic detector 1, which is towed by a tidal current different from the surface current. The magnetic signal from the magnetic detector 1 and the position of the magnetic detector 1 from the acoustic sonar 5.
The signal indicating the depth is from the control device 8 installed on the towing vessel Otsu.
sent to. The towing device 3 constantly measures the position of the float 6 to reduce errors in the search position.

FIG. 2 is a circuit block diagram of the embodiment shown in FIG. 1, including the constituent circuits of the control device 8. The magnetic signal from the magnetic detector 1 is applied to a filter circuit 11, which removes noise caused by towing vibration of the magnetic detector 1, etc.
The magnetic signal from which noise has been removed is applied to the signal calculation and discrimination circuit 12. Further, since a signal indicating the depth and position of the magnetic detector 1 is applied from the acoustic sonar 5 to the depth/azimuth detection circuit 13, the signal calculation discrimination circuit 12
It is determined whether the magnetic signal is above a predetermined level or not, taking into account the depth of the magnetic field and the position signal. Even if the magnetic signal has a certain level, a metal object as small as an empty can will not exceed a predetermined level and will not be considered an abnormal magnetic object. If an abnormal magnetic object such as a mine is detected, the signal processing circuit 12 sends a signal to the target device 4, stores its position in the target storage circuit 14, and disconnects the target device 4 from the magnetic detector 1 to After a certain period of time, a pin is projected by a sounding body from the marking device 4. Furthermore, the control device 8 has a detector position indicator 15. Magnetic signal indicator 16. Target display 1
7, and the detector position display 15 receives a signal from the depth direction detection circuit 13 and displays the depth and position of the magnetic detector 1.

The magnetic signal indicator 16 is the magnetic detector 1. Filter circuit 11
．． The magnetic signal obtained by changing every moment through the signal calculation circuit 12 is displayed, and the target display 17 detects an abnormal magnetic object and displays the position of the position set on that object. Although not shown in the figure, the control device 8 is equipped with a recording device that plots the amount of magnetic signals on a track chart along with the towing. Five are also recorded.

When searching for abnormal magnetic objects underwater using the underwater magnetic exploration device described above, float the towing device 3 in the sea area to be explored as shown in FIG. Tow marker aircraft 4. When an abnormal magnetic object exists on the seabed, the magnetic detector 1 detects it, and the signal processing circuit 12 outputs a discrimination signal, so the target device 4 is separated.
A sound signal is emitted from the sounding body of the target device. Further, the control device 8 of the towing device 3 records the point where the marking device 4 is set. Therefore, the anomalous magnetic object recovery vessel refers to the position information of the target point received from the towing device 6, and
By searching for the sound signals from the target device 4, abnormal magnetic objects can be easily recovered.

In the above embodiment, instead of one magnetic detector being towed by the towing cable 2, a plurality of magnetic detectors are deployed laterally on the deployable cable at predetermined intervals, so that a wide area of water can be explored. becomes possible.

Further, in the above embodiment, the acoustic sonar is installed on a float floating on the water surface, but the acoustic sonar may be attached to a magnetic detector to measure the depth, and the direction may be tracked and confirmed from the towing boat side.

As described above, according to the underwater magnetic exploration device of the present invention, since the magnetic detector is towed by a towing cable, exploration is possible at high speed and even at great depths, and i! Since the tow boat and the magnetic detector are separated by the tow cable, magnetic noise from the tow boat does not enter. Furthermore, when the signal calculation and discrimination circuit derives a discrimination output for an abnormal magnetic object, the target device connected to the magnetic detector is disconnected, and the target device targeted at the abnormal magnetic object is controlled to emit a signal. Since the first recovery ship can track not only the location information of the abnormal magnetic object but also the transmitted signal.

This has the advantage of improving the efficiency of recovery work using a dipper or the like.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG. 2 is a circuit block diagram of the embodiment shown in FIG. 1, including the constituent circuits of a control device. 1: Magnetic detector, 2: Towing cable. 3: Towing vessel, 4: Marker, 5: Acoustic sonar. 6: Float, 7: Sona towing cable. 8: Control device, 11: Filter circuit. 12: Signal calculation discrimination circuit, 13: Depth direction detection circuit, 14: Target storage circuit, 15: Detector toad position indicator, 16: Magnetic signal indicator. 17: Target indicator. Patent applicant Shimadzu Corporation Representative Patent attorney Shigeru Nakamura

Claims (4)

[Claims] (1) A magnetic detector that detects an abnormal magnetic object being towed by a towing device, a target aircraft that is towed together with the magnetic detector and is separated when it detects the abnormal magnetic object and emits a certain signal, and the magnetic A sonar that detects the position and depth of the detector, and a magnetic detector mounted on the towing vessel and located on the sonar. Underwater magnetism comprising a control device having a circuit that receives a magnetic signal from the magnetic detector and determines the presence or absence of an abnormal magnetic object, and a circuit that controls the target vehicle to be separated upon detection of the abnormal magnetic object. exploration equipment. (2) The underwater magnetic exploration device according to claim 1, wherein the sonar is attached to a float towed by the towing device. (3) 1? 2. The underwater magnetic exploration device according to claim 1, wherein the sonar is attached to the magnetic detector. (4) The underwater magnetic exploration device according to claim 1, wherein the control device includes means for receiving a signal from the marker and recording its position.