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27 May 2011 Dynamic concentricity measurement of large interval-diameter ratio holes with virtual annular quadrant method
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Dynamic concentricity measurement of small holes distributed in large room is valuable in assembling some big and complex optical facility. It's not feasible for the conventional measurement with portable CMM or laser tracker. A solution of dynamic concentricity measurement is put forward in this article, in which low power laser was selected as reference and camera &lens were used to acquire images of holes and laser spots. The relative orientation of hole and spot could be detected after image processing. To overcome the shortcoming that the edge of laser spot could not be detected for laser's Gaussian character with traditional method, a virtual annular quadrant (VAQ) method was proposed to determine the relative orientation between small holes and laser spot. With the simulation of VAQ method, the property was analyzed and the parameters of VAQ were optimized with the simulation results. Experiments were carried out to test VAQ method, and comparison of simulated and experimental results has confirmed the accuracy of VAQ method. A dynamical concentricity measuring system based on VAQ method is developed, which can perform one measurement in 5 seconds and has accuracy of about 0.015mm.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Qian Liu, Weichuan Yang, Bing Yao, Jiadong Jang, and Jun Hu "Dynamic concentricity measurement of large interval-diameter ratio holes with virtual annular quadrant method", Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 80823B (27 May 2011);


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