A special target set for laser scanner spatial performance calibration
Short abstract:
Because of the symmetry in all directions, spherical targets are widely used in various 3D laser scanner measurements. In this paper, a special spherical target set is proposed, which makes the target prism of the laser tracker and the target sphere center of the laser scanner stay in the same position. In this scheme of split standard target group, a scanning target ball and a laser tracker’s target prism are connected to two identical connecting mechanisms, respectively. Experiments show that the repetitive placement accuracy of this target in the Z direction is less than 10mm, and in both the X and Y directions are less than 5mm. Through mechanical designing and subsequent adjusting, it is very convenient to ensure that the concentricity of laser tracker’s target prism and laser scanner’s target ball is less than 0.05mm. A standard device for the calibration of spatial distance indication error is also made up by installing six sets of split target groups on a rigid structure. Any two target groups can form a standard distance whose length can be calibrated by a laser tracker. At last, the extended uncertainty of the standard distance provided by the standard device can be assessed as 0.07mm (when the standard distance is 3m), which can be effectively applied to the spatial distance indication error calibration of the laser scanner.
Fangfang Liu Shanghai Institute of Metrology and Testing Technology, China, Doctor/Senior Engineer.
Yu Ren, Shanghai Institute of Metrology and Testing Technology, China, Doctor/ Engineer.
Wenjian Zhang, Shanghai Institute of Metrology and Testing Technology, China, Engineer.
Contact information: 1500 Zhangheng Road, Shanghai,China.
Phone number: 86-021-38839800*33226
Email address: liu_ff@foxmail.com
Note: A technical paper will be submitted.
Content category: (c) Calibration
