Digital filtering of ghost signal in phase measuring deflectometry

Byeongjoon Jeong, Sotero Ordones, Henry Quach, Daewook Kim, Heejoo Choi

Research output: Contribution to journalArticlepeer-review


We introduce a method of geometric screen modification to remove ghost reflections commonly observed in deflectometry optical testing. The proposed method modifies the optical layout and illumination source area to bypass the generation of reflected rays from the undesired surface. The layout flexibility of deflectometry allows us to design specific system layouts that avoid the generation of interrupting secondary rays. The proposed method is supported by optical raytrace simulations, and experimental results are demonstrated with convex and concave lens case studies. Finally, the limitations of the digital masking method are discussed.

Original languageEnglish (US)
Pages (from-to)1642-1645
Number of pages4
JournalOptics letters
Issue number7
StatePublished - Apr 1 2023

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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