JPH0620191B2 - Measurement data collection system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measurement data collection system for collecting measurement data transmitted from measuring instruments such as inclinometers and seismometers installed on the seabed.

(Prior art and its problems) In general, measuring instruments such as seismographs and inclinometers for measuring the condition of the seabed are installed and fixed under the seabed in terms of measurement accuracy. In order to collect the measurement data observed by such measuring equipment at the maritime base, it can be easily realized, for example, by suspending the data collecting means connected from the marine base by a transmission cable near the measuring equipment. When the equipment is installed in the deep sea, the transmission cable may not be practically used due to the pressure resistance of the transmission cable.

Therefore, conventionally, as shown in FIG. 3, the measurement data is temporarily stored in the measuring device a, and a data transmission request command is transmitted from the marine base b such as a ship anchored at sea to the measuring device a. The measurement data stored in the measuring device a is converted into an ultrasonic signal and transmitted to the sea base b. In that case, the transducer a1 provided in the measuring device a and the transducer b1 suspended from the marine base b
Ultrasound signals are transmitted and received between and. In the transmission and reception of such ultrasonic signals, the higher the ultrasonic carrier frequency, the larger the absorption and attenuation during transmission and the inaccurate data transmission, so normally, an ultrasonic signal with a relatively low carrier frequency of about 10 kHz is transmitted. Is performed. However, such a low-frequency ultrasonic signal requires a long time for data transmission, which causes problems such as maneuverability of the ship while moored at sea, and inconvenience that the measuring device a consumes a large amount of power. . Moreover, both transducers a
If the distance between 1 and b1 is long, it may be affected by the school of fish and tidal current, and accurate data transmission may not be possible.

The present invention has been made in view of such circumstances, and makes it possible to reliably collect the measurement data measured by the measurement device at the marine base, and at the time of transmitting the measurement data, the power consumption of the measurement device. The aim is to reduce consumption.

(Means for Solving the Problems) In order to achieve such an object, the present invention provides a measuring instrument that is installed on the seabed and has a transducer that communicates with an ultrasonic signal, and an ultrasonic device that is suspended from a marine base. From the measuring device, a reception confirmation unit having a transducer that communicates with a sound wave signal, a first transducer that communicates with the measuring device with an ultrasonic signal, a second transducer that communicates with the reception confirmation unit with an ultrasonic signal, And a means for installing the data collecting means at a predetermined position in the sea and collecting the data, the data collecting means being relatively close to the measuring device. After installation at a distance, the data collection means transmits a data transmission request signal to the measuring device and receives measurement data from the measuring device. And so as to transmit the acknowledgment signal to the acknowledgment unit during reception and end Hajimeji.

(Operation) The measurement data obtained by the measuring device is not directly transmitted to the marine base, but is transmitted to the data collecting means and stored therein. In this case, since the transmission distance between the measuring device and the data collection means can be made relatively short, data transmission can be performed with an ultrasonic signal having a high ultrasonic carrier frequency.

Further, when the data collecting means receives an ultrasonic signal from the measuring device and transmits a reception confirmation signal toward the sea in response to this, the reception confirmation means hung from the sea base receives this signal. . In that case, at the maritime base, it is sufficient if it is possible to confirm that the data collection means receives and stores the measurement data transmitted from the measurement equipment, so the reception confirmation signal transmitted from the data collection means to the reception confirmation means is extremely low. It may be a signal at the acoustic carrier frequency.

Then, after the measurement data is once stored in the data collection means, the measurement data stored in the data collection means is collected by collecting the data collection means at the sea base.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is an explanatory diagram of a measurement data collection system according to an embodiment of the present invention. In the figure, reference numeral 1 is a measurement data collection system, 2 is a measuring instrument such as an inclinometer or a seismometer installed on the seabed 4, and a transducer 6 for converting the measured measurement data into an ultrasonic signal for communication. It is provided. Reference numeral 8 denotes a ship anchored as a sea base. 10
Is a data sampling means for communicating with the measuring device 2 and receiving and storing an ultrasonic signal based on the measurement data transmitted from the measuring device. The data collecting means 10 includes a first transducer 12 for communicating ultrasonic signals with the transducer 6 of the measuring device 2, a storage circuit 14 for storing the received measurement data, and a reception confirmation means described later. 20 and a second transducer 16 for communicating ultrasonic signals. 18 is a data collection means 10
Is installed at a short distance from the measuring device 2 and is a means for collecting after collecting the data. In this example, a wire rope suspended from the ship 8 is applied. Reference numeral 20 denotes a reception confirmation means for receiving a reception confirmation signal transmitted from the data collection means 10. The reception confirmation means 20 includes a reception transducer suspended from the ship 8 by a transmission cable 22 and a transmission cable 22. Receiver 2 of the maritime base connected to the end
6 and 6.

In the measurement data collecting system 1 of this embodiment, when the ship 8 arrives at the sea where the measuring device 2 is installed, the data collecting means 10 and the receiving transducer 24 are suspended from the ship 8. The data collection means 10 is the measuring device 2
Data collection means 1 if a location relatively close to
Stop the suspension of 0.

When the timer incorporated in the data collecting means 10 times out, the data collecting means 10 transducer 12 issues a data transmission request signal having a high carrier frequency, for example, 100 kHz to the measuring instrument 2. Measuring instrument 2
Upon reception of this data transmission request signal, the measuring device 2 starts transmitting the measurement data, and the transducer 6 emits an ultrasonic signal based on the measurement data toward the data collecting means 10. In this case, the ultrasonic signal transmitted from the transducer 6 of the measuring device 2 is 100
Since the carrier frequency is high in KHz, data can be transmitted in a short time. Then, the ultrasonic signal transmitted from the measuring device 2 is received by the transducer 12 of the data sampling means 10 and stored in the storage circuit 14.

On the other hand, the data collecting means 10 transmits a reception confirmation signal having a low carrier frequency of about 10 kHz from the transducer 16 to the sea at the start and end of reception of the ultrasonic signal from the measuring device 2. This reception confirmation signal is received by the reception transducer 24 of the reception confirmation means 20, and is sent to the receiver 26 via the transmission cable 22. The receiver 26 emits a reception sound when receiving the reception confirmation signal from the data sampling means 10. This allows
It is confirmed that the data is transmitted from the measuring device 2 to the data collecting means 10.

When all the measurement data is stored in the data collecting means 10, the data collecting means 10 and the receiving transducer 24 are stored.
Are collected in the ship 8, the measurement data stored in the data collecting means 10 is reproduced, and signal processing is performed.

Although the wire rope 18 is used as a means for installing the data collecting means 10 at a predetermined place on the seabed in the above-mentioned embodiment, the invention is not limited to this, and the weight 30 is used as shown in FIG. , Float 32 and separating means 3
4 and 4 are attached to the data collecting means 10, and the data collecting means 1
After the measurement data are all stored at 0, the disconnecting means 34
Is operated to separate the weight 30, and the data collecting means 10
It is also possible to float on the sea and collect it.

(Effect) As described above, according to the present invention, the measurement data obtained by the measuring device is not directly transmitted to the sea base, but is transmitted from the measuring device to the data collecting means installed at a relatively short distance. Since it is stored here, the ultrasonic signal transmitted from the measuring device may have a high ultrasonic carrier frequency, and therefore the measurement data can be transmitted within a short time. Therefore, by collecting the data collecting means, the measurement data measured by the measuring device can be surely collected at the marine base, and the power consumption of the measuring device when transmitting the measuring data can be reduced. Further, in the deep sea, it is not affected by the school of fish so that reliable data transmission can be achieved.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is an explanatory diagram of a measurement data collecting system, FIG. 2 is an explanatory diagram of another embodiment of the present invention, and FIG. 3 is an explanatory diagram of a conventional measurement data collecting system. 1 ... Measurement data collection system, 2 ... Measuring equipment, 8 ...
… Vessels, 10 …… Data collection means, 18 …… Wire ropes, 20 …… Reception confirmation means.

Claims (1)

[Claims] 1. A measuring device installed on the seabed and having a transducer for communicating with ultrasonic signals, a reception confirmation means having a transducer suspended from a marine base for communicating with ultrasonic signals, and the measuring device and ultrasonic signals. And a second transducer that communicates with the reception confirmation means by an ultrasonic signal, and a data collection means that has a storage unit that stores the measurement data from the measurement device, and the data collection means. At a predetermined position in the sea, and means for collecting, and after the data collecting means is installed at a relatively short distance from the measuring equipment, the data collecting means sends a data transmission request signal to the measuring equipment. Along with the transmission, a reception confirmation signal is transmitted to the reception confirmation means at the start and end of reception of the measurement data from the measuring device. A measurement data collection system characterized in that