Development of an ultra-high-speed 3D profilometer for real-time, kilohertz display volumetric imaging

三维（3D）光学计量对于无数应用是非常重要的。在现有技术中，基于数字微镜器件（DMD）的结构光（SL）三维轮廓术由于其灵活性和低成本而得到越来越广泛的应用。尽管基于SL的三维轮廓术在深度分辨率和响应光谱方面有了快速的提高，但成像和显示速度并没有跟上，主要是由于两个困难。首先，现有的单次正弦条纹投影存在残余噪声，并且容易受到相位畸变的影响。第二，现有SL型三维轮廓仪中的高速摄像机不具备足够的数据下载速度。Ajile Light Industries（ALI）是加拿大领先的基于DMD的三维轮廓仪设计和制造公司。ALI一直在寻找新的方法来提高AjileWARE 3D相机的体积速率到kHz水平。在2016年SPIE的Photonics West会议上，ALI与梁教授就此主题建立了合作。作为促进这一大学与工业界合作的第一步，Engage应用程序旨在开发一种超高速3D轮廓仪，能够以kHz帧速率进行单次拍摄、精确的正弦图案投影和实时、连续流3D成像。梁教授的团队在成像仪器设计、超快3D成像和基于DMD的激光光束整形方面拥有丰富的研究经验。ALI将提供3D重建软件和DMD控制器系统。补充的专业知识，完全涵盖了项目的知识范围，将确保成功和迅速完成拟议的项目。可以预见，开发的轮廓仪将打开在科学研究和工业应用的新途径。所产生的知识和技术诀窍将有助于今后的产品开发和技术转让。

Three-dimensional (3D) optical metrology is of great importance to myriad applications. Among existingtechnologies, the structured light (SL) 3D profilometry based on a digital micromirror device (DMD) hasobtained increasing popularity owing to its flexibility and low cost. Despite the fast improvement in depthresolution and responding spectrum, the imaging and display speed of SL-based 3D profilometry has not keptpace, mainly due to two difficulties. First, current themes of single-shot sinusoidal fringe projection haveresidual noise and are subject to distortion induced by phase aberration. Second, the state-of-the-art high-speedcameras in existing SL-based 3D profilometers do not possess a sufficient data download speed.Ajile Light Industries (ALI) is Canada's leading DMD-based 3D profilometry designing and manufacturingcompany. ALI has been seeking novel methods to increase the volumetric rate of their AjileWARE 3D camerato kHz levels. At 2016 SPIE's Photonics West conference, ALI established a collaboration with Prof. Liang onthis topic. As an initial step to promote this university-industry partnership, this Engage application aims todevelop an ultra-high-speed 3D profilometer capable of single-shot, precise sinusoidal pattern projection andreal-time, continuous-streaming 3D imaging at kHz frame rates.The proposed project comes in the auspicious confluence of talents. Prof. Liang's group has extensiveresearch experience in imaging instrument designing, ultrafast 3D imaging, and DMD-based laser beamshaping. ALI will provide the 3D reconstruction software and their DMD controller system. Thecomplementary expertise, fully covering the knowledge scope of the project, will ensure the successful andprompt completion of the proposed project. It is envisioned that the developed profilometer will open newavenues in both scientific research and industrial applications. The generated knowledge and technicalknow-how will assist in future product development and technology transfer.