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    • 8. 发明授权
    • A MARKER FOR SUBTERRENEAN MARKING AND A NOVEL APPLICATION FOR SUCH A MARKER
    • 标记标记和标记的新颖应用程序
    • EP0090021B1
    • 1988-08-24
    • EP82903137.6
    • 1982-10-07
    • PEDERSEN, Willy Palle
    • PEDERSEN, Willy Palle
    • G01C15/04G01V3/11
    • G01C15/04G01V15/00
    • A subterranean marker of the earth coil type is made as a longish and narrow cylindrical unit which is easy to mount in a hole without real digging work. The unit includes a resonance circuit having a coil which is wound on a ferrite core, which conditions the small diameter of the unit. The housing of the unit is thick walled for ensuring constantly good dielectric properties in the immediate surroundings of the coil, regardless of mounting conditions, and the housing is sealed for safeguarding the interior dielectric properties. The marker is extremely durable and reliable and conditions a very accurate localization of the surface point above the marker, and in practice this is decisive for an important novel application or use of such markers, viz. the use of subterranean markers for the marking of official fixpoints in geodetic and similar land register systems.
    • 大地测量点系统包括由具有谐振电路的地下固定点标记标记的多个地面固定点。 标记通过由表面搜索检测器可搜索的虚拟垂直轴显示自身,并且通过虚拟垂直轴和地面之间的交叉找到固定点。 标记被安装成具有足够的间距,以允许任何固定点在目视标记时从系统的至少一个其他固定点可见。 表面搜索检测器产生作为标记的谐振电路的标称谐振频率的频率,并且从标记接收产生的频率以搜索虚拟垂直轴。