Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College Dublin Dublin 4 IrelandSchool of Control Engineering Northeastern University at Qinhuangdao Qinhuangdao 066004 China;
Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College Dublin Dublin 4 IrelandState Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology(MNMT) Tianjin University Tianjin 300072 China;
surface topography; measurement; optical interferometry; coherence envelope; phase-shifting algorithm;