高动态范围条纹结构光在机检测技术及应用进展

On-machine detection technology and application progress of high dynamic range fringe structured light

条纹结构光技术是近年来发展迅速的非接触式测量方法,为机械加工在机检测提供了新的解决方案。由于加工环境光线复杂且金属零件本身具有高反光的特性,造成结构光在机检测的精度降低。将高动态范围(High Dynamic Range,HDR)技术应用于结构光检测中,可抑制高反光的影响,实现金属零件在复杂场景的测量。本文首先介绍了结构光测量原理,总结出HDR结构光在机检测面临的难点;其次,对HDR结构光技术进行了全面综述,以机械加工在机检测为背景,对基于硬件设备的HDR技术和基于条纹算法的HDR技术分别进行了归纳分析;然后,根据在机检测的条件需求,对各类技术进行总结,并比较不同方法的优缺点和在机检测的适用性;最后,结合近年来先进制造技术和精密测量的研究热点,对潜在应用进行分析,提出技术展望。

Fringe structured light technology is a non-contact measurement method,which has developed rapidly in recent years and provides a new solution for on-machine detection in mechanical processing.However,the accuracy of structured light for on-machine detection is compromised by the convoluted lighting in machining environments and metal parts’high reflectivity,leading to inaccurate measurements.Applying high dynamic range(HDR)technology to structured light detection can reduce the effect of high reflectivity,achieving the measurement of metal parts in complex scenes.This paper introduces the measurement principle of structured light and summarizes the challenges of on-machine detection for HDR structured light.Subsequently,this paper provides a comprehensive review of HDR structured light technology.In the context of on-machine detection of mechanical processing,the HDR technology based on hardware equipment and the HDR technology based on stripe algorithm are discussed and analyzed,respectively.Following this,different technologies are summarized according to the requirements of on-machine detection.The advantages and disadvantages of various methods are presented,and the applicability of on-machine de-tection is compared.Finally,the potential applications are analyzed,and the technological prospects will be proposed in combination with the research hotspots of advanced manufacturing technology and precision measurement in recent years.