| 摘要 |
PROBLEM TO BE SOLVED: To surely discriminate the reflected light of a target and perform a highly precise range finding by receiving and calculating the reflected light from the target of a pulse laser beam by opening a gate only for a prescribed time according to the target. SOLUTION: The shape measuring device applied to, for example, cokes or iron ore in a hold of ship scans a pulse laser beam 5 along the whole surface of a target, receives the reflected light, and three-dimensionally measures the shape of the target from the time difference. A time measuring counter 22 opens a gate only for a prescribed time set according to the position of the target and processes the received signal during it. Thus, a signal such as reflection from a window can be removed. When a plurality of signals are received, the reciprocating time of the slowest signal is outputted, whereby the influence of dust in front of the target can be avoided. The transmitted signal and the received signal are detected by respective prescribed thresholds and maximum values and approximated by a parabola, whereby a highly precise range finding can be performed even when the received signal is attenuated. |
