激光电子散斑干涉法隐形牙齿矫治器全场变形测量  

Whole-field deformation measurement of clear orthodontic aligner using electronic speckle pattern interferometry

作　　者：王嘉雯 吴峻青 吴敏杨 安应彪 刘京京 严斌[2] 杨福俊[1] WANG Jiawen;WU Junqing;WU Minyang;AN Yingbiao;LIU Jingjing;YAN Bin;YANG Fujun(School of Civil Engineering,Southeast University,Nanjing 211189,China;Department of Orthodontics,The Affiliated Stomatological Hospital of Nanjing Medical University,Nanjing 210029,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189 [2]南京医科大学附属口腔医院正畸科,江苏南京210029

出　　处：《光学精密工程》2024年第17期2663-2675,共13页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.12072073,No.82071143);江苏省重点研发计划临床前沿技术项目(No.BE2022795)。

摘　　要：构建三维表面微变形同步干涉测量系统,客观准确地测量隐形矫治器的全场变形信息,为提高其临床矫治效能以及安全性提供数据支持。由蓝绿红激光构建三组各自独立的散斑干涉光路,用于同步测量物体表面的二维面内和一维离面变形,利用一个集成相移装置实现三色激光准90°步长的同步相移,并由一台3CCD彩色相机同时记录三色散斑干涉图。通过四步相移算法从分离的红、蓝及绿色散斑干涉图中计算出与离面和面内变形相关的干涉条纹相位;最后,结合自适应条纹滤波和数字差分算法计算得到与表面变形有关的6个应变分量。微转动实验表明:系统的微转角测量精度为2.4",变形测量精度为10με(微应变)。对隐形矫治器的变形测量结果分析表明,矫治器的变形效用与设定的矫治目标相一致。To objectively and accurately measure the full-field deformation of clear aligners for improved clinical effectiveness and safety,a comprehensive three-dimensional deformation measurement system based on laser electronic speckle pattern interferometry has been established.The specimen's surface is illu⁃minated with a tri-wavelength laser,generating a color speckle pattern.A phase-shift device produces a quasiπ/2 phase step for all three color channels.Multi-frame images of the color speckle pattern are cap⁃tured using a 3CCD color camera.Deformation phases are extracted using a 90°step four-frame technique from the separated red,green,and blue channels.A window-deformable filter effectively denoises the phase fringe patterns,allowing six derivative components to be obtained directly from the three deforma⁃tion components using a digital differential method.Results show that the system achieves a precision of no more than 2.4''for micro-rotation and better than 10μεfor strain measurements.Experimental results on clear aligners align closely with expected outcomes.

关 键 词：三维测量 激光电子散斑干涉 微变形 隐形矫治器 

分 类 号：O439[机械工程—光学工程]