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在水工建筑物变形观测、滑坡监测、大型工程施工放样和光电测距仪的检校工作中,仪器与照准标志的对中误差,均是影响观测精度的重要因素。现行大坝监测规范中规定:用垂线法观测,对中误差不应大于0.1mm;用视准线法观测,对中精度不应低于0.2mm。在大型工程精密控制网和光电测距仪的检校工作中,如采用ME5000测距仪测距,仪器的精度为0.2mm+0.2PPM。由于测距精度很高,因此对仪器和照准标志的对中精度要求则更高。由此可见,在精密测量工作中,为了满足上
In the hydraulic structure deformation observation, landslide monitoring, large-scale construction project setting-up and photometric rangefinder calibration work, the alignment error between the instrument and the mark is an important factor affecting the observation accuracy. The existing dam monitoring code stipulates: Observation with the vertical line method, the error should not be greater than 0.1mm; with visual line method of observation, the accuracy should not be less than 0.2mm. In the large engineering precision control network and optical distance measuring instrument calibration work, such as the use of ME5000 rangefinder ranging, the accuracy of the instrument is 0.2mm + 0.2PPM. Due to the high accuracy of the ranging, the alignment accuracy of the instrument and the sighting mark is higher. Thus, in the precision measurement work, in order to meet the above