| 摘要 |
PROBLEM TO BE SOLVED: To provide such a means that can measure the berthing speed of a vessel by automatically detecting the vessel at a low cost with a relatively simple constitution. SOLUTION: A laser sensor 2 installed to a quay 1 is mounted on a turntable 10 for controlling the direction of the sensor 2 and, at the time of scanning, the turntable 10 changes the angle of the sensor 2 in the vertical direction within the laser beam axis moving range 5 between a laser beam irradiation axis A3 along which the position 6 of a vessel can be detected at high tide and another laser beam irradiation axis B4 along which the position 8 of the vessel can be detected at low tide so that the sensor 2 may detect the vessel by changing the laser beam irradiation axis of the sensor 2 even when the position of the vessel changes in the vertical direction. Then the berthing speed of the vessel is measured by fixing the laser beam irradiation axis at the position at which the sensor detects the vessel. When the measurement is omitted while the vessel comes alongside the quay, the position of the vessel is detected by again moving the sensor 2.
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