大型锻件热态三维结构光在线测量技术

针对大型锻件尺寸的在线测量问题，提出一种基于结构光的立体视觉测量方法。该方法针对红热态高温条件下结构光条纹难以获取的问题，采用物理滤色和数字滤色相结合的办法克服热态表面辐射的影响，同时采用多频相移技术以显著提升抗噪能力；针对大型物体测量提出了基于标记球的多视测量自动拼接方案。现场实验验证表明，基于结构光立体视觉的三维测量实验系统可以在15 m 远距离实现在线大型锻件非接触测量，具有测量速度快、测量精度高、方便快捷、简单可靠的特点，能满足大型铸锻件热态在线测量的要求。

Abstract

To meet the requirement of online measurement of large forgings in thermal state, a method based on structured light stereo vision technique was presented. To solve the problem of the acquirement of structured light strip on the condition of thermal state, the method combined physical filtering and digital filtering to overcome the influence of red thermal radiation，and temporal phase unwrapping structured light technology was also used to improve the optical noise immunity significantly. Multi-view auto registration techniques based on mark balls were adopted to measure large objects. An experimental system has achieved non-contacting 3D measurement of large forging in 15 m distance. The experiment proves that the method has advantage of high-speed and high- precision, and it is also simple and convenient,which can meet the requirements of online measurement of large forging in thermal state.

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刘桂华, 刘先勇, 冯全源, 魏志勇, 张启戎, 高国防. 大型锻件热态三维结构光在线测量技术[J]. 光电工程, 2010, 37(9): 91. LIU Gui-hua, LIU Xian-yong, FENG Quan-yuan, WEI Zhi-yong, ZHANG Qi-rong, GAO Guo-fang. Online Measurement Techniques of Large Forgings in Thermal State[J]. Opto-Electronic Engineering, 2010, 37(9): 91.

大型锻件热态三维结构光在线测量技术

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