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一、前言在变形观测和短边精密控制网的测量中,仪器与照准目标的对中误差,是影响观测精度的重要因素。欲使短边精密控制网的测角中误差达到1秒以内,或用视准线法测定混凝土水工建筑物水平位移,总的误差要求不超过1毫米时,就必须对仪器、照准目标、操作方法和外界条件等加以研究和限制。如果采用常规的垂球对中法,一次对中即可带来数毫米误差,
I. INTRODUCTION In the measurement of deformation observation and short-side precision control network, the alignment error between the instrument and the sighting target is an important factor that affects the observation accuracy. To make short-angle precision control network angle measurement error of less than 1 second, or with the line of sight method for measuring the horizontal displacement of hydraulic concrete structures, the total error of less than 1 mm, it must be on the instrument, aimed at the target , Methods of operation and external conditions to be studied and limited. If you use the conventional vertical ball method, a pair can bring a few millimeters error,