Journal
MEASUREMENT
Volume 208, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2023.112443
Keywords
Surface topography; Digital holography; Defect; Phase shifting; Fast measurement
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A proposed method using interferometric holography and wavefront registration achieves fast and efficient cross-scale measurement of surface defects on large opto-electronics components.
The microscopic characterization of the surface defects on large opto-electronics components is essential to ensure the performance of major equipment. However, existing technology cannot achieve efficient and reliable fast cross-scale measurement due to the requirement on vertical scanning or polarization modulation for multi-frame capturing at each position. An effective approach is proposed to solve this problem, which needs to record only one interferometric hologram at each location and achieves full-area measurement by traversing over the surface. The overlapped area between adjacent regions are specified by wavefront registration and the topog-raphy in this area is obtained by two-step phase shifting and holographic reconstruction. Experimental results demonstrate that the proposed method can achieve fast and fast measurement of large specular components with high accuracy and high efficiency.
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