High Speed 3D Surface Inspection with Digital Holography
Digital holography has proven its ability to acquire high accuracy full field 3D data with one single image acquisition.This means that in principle this technique offers the chance to perform 3D serial inspection processes,as well.However,one limitation in digital holography is its limited ability to measure rough surfaces.In the presence of rough surfaces,the magnification of the image has to be increased to capture the required phase information on each camera pixel.However,this leads to significant reduction of inspection speed.If low magnification is selected,the rough surface produces speckles which cannot be treated properly by digital holography algorithms.In this paper,we describe the extension of digital holography to rough surface applications using speckle interferometry technique.This technique is capable of fast inspection of rough surfaces with sub-micrometer accuracy.The principle of this approach is shown and a practical application for 3D surface inspection of wafer cutting processes is given.
Digital holography speckle interferometry 3D inspection high speed inspection
Andreas Brunn Nicolas Aspert Etienne Cuche Yves Emery Andreas Ettemeyer
NTB - Interstate University of Applied Sciences of Technology, Werdenbergstrasse 4, 9471 Buchs,Switz Lyncée Tec SA, PSE-A, 1015 Lausanne, Switzerland
国际会议
2012第八届精密工程测量和仪器仪表国际研讨会(ISPEMI2012)
成都
英文
1-7
2012-08-08（万方平台首次上网日期，不代表论文的发表时间）