| 摘要 |
PURPOSE:To always keep a measuring device in the operation state with high precision by constituting a protecting cover which is installed in suspended state from the vessel bottom in order to cover the periphery of a supersonic- wave utilizing underwater measuring device, from the hollow body which has substantially a three dimensional streamline form. CONSTITUTION:A hollow body substantially having three dimensional streamline form is adopted as a protecting cover 2 which covers the periphery of a supersonic-wave utilizing underwater measuring device 1.... Therefore, even if the swing movement such as pitching and rolling of a hull is generated, a large load is not generated under the hollow body in three dimensional streamline form, and substantially a negative pressure is always generated on the upper side where the length of the streamline of the hollow body is longer. Therefore, the gas foams which flow from the bow side are shown by the arrow Z and are not sucked under the hollow body. Further, the generation of gas foams due to the cavitation phenomenon in the conventional is prevented. Therefore, the gas foams are hardly seen directly under the measuring device 1, which can be operated with high precision.
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