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为了满足地下洞室工程的施工和竣工测量需要,我们委托湖北综合勘察院将一台J_6型光学经纬仪与一台具有衍射频谱和投影成象的激光准直系统改装成激光经纬仪,并在经纬仪的物镜一端安装了能围绕视准轴旋转的五角棱镜装置,如图1所示。仪器经断面测量的测试应用,效果良好,满足了地下洞室工程断面测量的技术要求。
In order to meet the needs of underground cavern project construction and completion surveys, we commissioned the Hubei General Survey Institute to convert a J_6 optical theodolite with a laser collimation system with diffraction spectrum and projection imaging into a laser theodolite and a theodolite. One end of the objective lens is mounted with a pentagonal prism device that can rotate around the sighting axis, as shown in FIG. 1 . The test application of the instrument through the cross-section measurement has a good effect and meets the technical requirements for the cross-section measurement of underground caverns.