Dual-wavelength Digital Holography Microscope for BGA Measurement Using Partial Coherence Sources

被引:10
|
作者
Cho, Hyungjun [1 ]
Kim, Doocheol [1 ]
Yu, Younghun [1 ]
Jung, Wonki [2 ]
Shin, Sanghoon [3 ]
机构
[1] Jeju Natl Univ, Dept Phys, Cheju 690756, South Korea
[2] Jeonju Univ, Sch Elect Engn, Jeonju 560759, South Korea
[3] AP & Tec, Seoul 135539, South Korea
关键词
Digital holography; Dual-wavelength holography; Error reduction; COMPENSATION;
D O I
10.3807/JOSK.2011.15.4.352
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Dual-wavelength holography has a better axial range than single-wavelength holography, allowing unambiguous phase imaging. Partial coherence sources reduce coherent noise, resulting in improved reconstructed images. We measured a ball-grid array using dual-wavelength holography with partial coherence sources. This holography method is useful for measurement samples that exhibit coherence noise and have a step height larger than the single wavelength used in holography.
引用
收藏
页码:352 / 356
页数:5
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