SHI Hao-tian,WU Di,PANG Cheng-kai,HUANG Hai-yan,ZHANG Xuan,XU Yan,CHEN Xiu-liang,WU Guang.Noncontact 3D measurement method on hole-structure precision inspection[J].Optoelectronics Letters,2021,17(4):231-235
Noncontact 3D measurement method on hole-structure precision inspection
Author NameAffiliation
SHI Hao-tian State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China 
WU Di State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China 
PANG Cheng-kai State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China 
HUANG Hai-yan State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China 
ZHANG Xuan AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China 
XU Yan AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China 
CHEN Xiu-liang State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China 
WU Guang State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China 
Abstract:
      In order to implement 3D point cloud scanning of small hole structure, which could not be contacted or damaged, we propose a noncontact 3D measuring method. The system contains a laser triangulation displacement sensor, a Michelson interferometer system and a coordinate measuring machine, with the advantages of non-invasive scanning, fast measurement speed and high precision. Focusing on reconstructing 3D point cloud data, random sample consensus is used to separate surface data and hole data respectively from the raw dataset. Least square optimization determines the function of the cylinder, as well as hole diameter and inclined angle between the hole and the surface. In the experiment scanning a round hole, the estimated result has diameter error and angle error within 30 μm and 0.2°, respectively. Results manifest the effectiveness and feasibility of this system and express practicality in manufacturing industry.
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