JP2789592B2 - Underwater monitoring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underwater monitoring device for monitoring the status of a submarine structure or the like, and in particular, adds only changed underwater monitoring information to initially stored underwater monitoring information. The present invention relates to an underwater monitoring device that stores and transmits stored information when receiving an information transmission command by an ultrasonic wave or the like from a monitoring ship or the like.

[Conventional technology]

Conventionally, this type of underwater monitoring device has been known in which the monitoring device is periodically pulled up, a magnetic tape or the like of a storage medium in an internal storage device is collected, a new storage medium such as a magnetic tape is set in the storage device, and the monitoring device is Was re-installed in the water. In addition, when the water depth is relatively shallow and a cable can be laid to the land, the cable was laid to the land, and the monitoring information of the seabed was transmitted to the land via the cable.

Further, the underwater monitoring information is stored in the storage device in the underwater monitoring device, and the monitoring ship periodically goes to the sea area where the underwater monitoring device is installed, and the monitoring information is transmitted from the underwater monitoring device to the monitoring ship by waves such as ultrasonic waves. The method of sending was adopted.

[Problems to be solved by the invention]

In the above-mentioned conventional underwater monitoring device, in the case of a method of periodically collecting the underwater monitoring device installed on the sea floor, the trouble of collecting and re-installing the underwater monitoring device from the sea floor at intervals of, for example, every one month or three months is eliminated. There is also a drawback in that it requires a recovery mechanism. On the other hand, in the case of cable laying on land, it is necessary to constantly monitor the cable so that it will not be caught by the fishing net etc. There are drawbacks such as the necessity of laying work again.

If all the underwater monitoring information is stored in the underwater monitoring device, the amount of information is large, and if the patrol boat comes to read the underwater monitoring information at relatively long intervals, the underwater monitoring information during that period is relatively long. In order to store this underwater surveillance information to a surveillance vessel, a large-capacity battery is required as a power source for transmission. Was.

[Means for solving the problem]

The underwater monitoring device of the present invention is installed in water, an underwater imaging device for imaging the underwater, a storage device that stores captured image information captured by the underwater imaging device, and the underwater imaging device A clock device that generates a trigger signal for imaging and supplies the trigger signal to the underwater imaging device, and a receiving device that receives a command signal for transmitting the captured image information to an external monitoring device from the external monitoring device through the water. A transmitting device that transmits the captured image information from the storage device read based on the command signal from the receiving device to the external monitoring device through the water together with time information from the clock device, The latest image information of the captured image information stored in the storage device is compared with the previous image information, and the difference between the latest image information and the previous image information is determined in advance. If within threshold and a comparison device for controlling the storage device so as not to store the latest image information in the storage device.

〔Example〕

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

FIG. 1 is a block diagram showing a basic configuration of the underwater monitoring device. The camera 1 of the underwater imaging device is installed near an underwater monitoring target, for example, an underwater bridge such as an underwater bridge, an excavation rig, a fish reef, or the like. When the television camera 1 receives a trigger signal from the clock device 2, it captures an image of the monitored object. This imaging signal is sent to the storage device 3, where it is stored as analog information or converted into a digital signal.

In order to collect the stored information of this underwater monitoring device 101,
When a ship regularly arrives in the sea area where the underwater monitoring device 101 is installed, a command signal for information transmission is sent from the ship into the sea by ultrasonic waves or the like. This command signal is received by the receiving device 11 including the wave receiver 5 and the command receiver 6. The command signal is first received by the receiver 5 and converted into an electric signal.
This electric signal is sent to the command receiver 6, and when it is determined that the signal is amplified and transmitted as a command signal for transmitting image information, the stored information is read from the storage device 3. The read signal is sent to a transmission device 12 including a transmitter 7 and a transmitter 8. In the transmitting device 12, the transmitter 7
The power is amplified by the transmitter, converted into an ultrasonic signal by the transmitter 8, radiated into the water, and transmitted to a ship on the water. The time signal of the clock device 2 is also sent to the transmitter 7 together with the stored information, and the time information at the time of information transmission is also sent together with the image information to the transmitter 12.
Is sent to a boat on the water.

FIG. 2 is an explanatory diagram showing the operation status of the underwater monitoring device according to the present invention.

The underwater monitoring device 101 according to the present invention is placed near the underwater building 102, is periodically imaged, and is stored in the storage device 3 in the underwater monitoring device 101. A ship 103 enters the sea area where the underwater monitoring device 101 is installed, for example, once a week or one month.
It patrols at the rate of the disclination (for observations in oceans far from land, this interval is reduced to once or twice a year). Therefore, a command signal for transmitting information stored in the underwater monitoring device 101 is transmitted from the ship 103 by ultrasonic waves or the like. This command signal is received by the receiving device 11 of the underwater monitoring device 101, and the information stored in the storage device 3 in the underwater monitoring device 101 is transmitted from the transmitting device 12 of the monitoring device 101 to the ship 103 by ultrasonic waves or the like. . Ship 103 receives this information,
Play the original image.

FIG. 3 is a block diagram showing an embodiment of the underwater monitoring device according to the present invention, in which a comparison device 4 is connected to the storage device 3 in the block diagram of FIG. The comparison device 4 compares the immediately preceding captured image information stored in the storage device 3 with new image information. This comparison device 4
In, a threshold value is set in advance to determine the coincidence of information, and the information within this threshold value is determined to be the same as the previous information. When it is determined that they are the same, a command code indicating that they are the same as the last time is stored as new storage information in the storage device 3, and at the time of transmission, image information is not transmitted for a certain part of the command code. The transmitter 7 is activated. In the onboard reader, the part that receives the command code indicating this same information is:
The image is reproduced using the previous information. As a result of this,
There is a possibility that the number of data stored in the storage device 3 is reduced and the patrol interval of the boat is extended, and if the patrol interval of the boat is almost the same as in the first embodiment, the transmission time can be shortened and the battery consumption is reduced. Reduction can be achieved.

〔The invention's effect〕

As described above, according to the present invention, the monitoring device is installed on the seabed and stored in a storage device having a smaller storage capacity than when all the underwater monitoring information is stored, so that the monitoring device can always be taken out through a ship on the sea. Monitoring information on underwater structures can be obtained regularly even if the ship that monitors the underwater is not in the vicinity of the monitoring target, and only the latest monitoring information that is different from the previous storage content is stored. Has the effect that the underwater monitoring information can be collected in a short time and the transmission power energy of the underwater monitoring device can be reduced.

In particular, when the object to be monitored is on the ocean far from the land where the number of round trips of the ship increases, this effect becomes remarkable because it is difficult for the ship to constantly engage in monitoring.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an underwater monitoring device of the present invention, FIG. 2 is an explanatory diagram showing an operation status of the present invention, and FIG. 3 is a block diagram showing one embodiment of an underwater monitoring device according to the present invention. It is. DESCRIPTION OF SYMBOLS 1 ... TV camera, 2 ... clock device, 3 ... storage device, 4 ... comparison device, 5 ... receiver, 6 ... command receiver, 7 ... transmitter, 8 ... transmission Device, 11 ... receiving device, 12
.... Transmission device.

Claims (1)

(57) [Claims] An underwater imaging device installed underwater for imaging the underwater; a storage device for storing image information captured by the underwater imaging device; and an image pickup device for causing the underwater imaging device to image the underwater. A clock device that generates a trigger signal and supplies the captured image information to the underwater imaging device, a receiving device that receives a command signal for transmitting the captured image information to an external monitoring device from underwater from the external monitoring device, A transmitting device that transmits the captured image information from the storage device read out based on the command signal from the receiving device together with time information from the clock device to the external monitoring device through the water and the storage device; The difference between the latest image information and the previous image information is compared with the latest image information of the stored captured image information and the previous image information within a predetermined threshold value. Underwater monitoring device, characterized in that it comprises a comparison device for controlling the storage device so as not to store the latest image information in the storage device in the case that.