High-accuracy measurement for small scale specular objects based on PMD with illuminated film

Yuankun Liu (Corresponding Author), Petri Lehtonen, Xianyu Su

Research output: Contribution to journalArticle

11 Citations (Scopus)


In this paper we describe an approach to measure small glossy objects by illuminated film based on Phase Measuring Deflectometry (PMD) system. In this setup, the standard sinusoidal fringe patterns are produced by the photographic film frame (135-film), which is illuminated from behind using LED and diffuser, instead of the well-known LCD monitor plane or digital projector. This setup can avoid the influence of electronic noise and screen refreshing, and fulfil the test of small objects in low cost. Moreover the system is easily calibrated with its vertical setup. With the experiments of measuring a plastic contactless smartcard and a metal plate, it is proven that the setup can reach sub-micrometer accuracy with respect to the data of the Wyko white light interferometer. This setup will be promising in the small scale measurement field.
Original languageEnglish
Pages (from-to)459-462
JournalOptics and Laser Technology
Issue number2
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed



  • LED illumination
  • Phase Measuring Deflectometry
  • specular object

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