3D Measuring and Marking System for Building Equipment: Developing and Evaluating Prototypes

The measuring work has been done manually with the scales in the construction of building equipments. We have been studying a 3D measuring and marking system using a total station to increase accuracy and decrease workload. One feature is the pointing device for measuring indirectly the hidden areas which cannot be measured with a stand-alone total station. The device has a sensor which consists of a pinhole and a position sensitive detector for measuring the incident angles of the received laser and it’s possible to calculate the pointing position by using the data. The other is the positioning device for marking accurately relative to the points which the total station indicates with the laser automatically. The displacement from the target position is calculated from the device position and the operator marks with the marking position adjusting function of the device. This paper describes the system configuration, measuring and marking theory of the system with those devices, and the results of evaluation experiments with prototypes.