AI Article Synopsis

  • Phase measuring deflectometry (PMD) is important for measuring the shape of shiny surfaces, and a new version called near optical coaxial PMD (NCPMD) offers a more compact and lighter design, along with reduced measurement errors caused by surface shadows.
  • The addition of a plate beamsplitter improves the NCPMD setup but introduces potential accuracy issues due to light refraction, which needs to be carefully analyzed.
  • A virtual system was developed to create an error model addressing the refraction effects, and new calibration methods and algorithms were proposed to effectively enhance the measurement accuracy, which were validated through experiments.

Article Abstract

Phase measuring deflectometry (PMD) is a key measurement technology for specular surfaces form measurement. Compared with conventional PMD techniques, the near optical coaxial PMD (NCPMD) can achieve compact configuration, light weight and reducing measurement error caused by shadows of the surface structures through utilizing a plate beamsplitter. However, the introduction of the plate beamsplitter will affect the measurement accuracy of the NCPMD system. The refraction of the plate beamsplitter needs to be considered. In this work, a virtual system of NCPMD was established, and an error model of the NCPMD system by considering the refraction influence of the plate beamsplitter was presented to analyze the shape reconstruction error caused by the plate beamsplitter. Moreover, the calibration method of the beamsplitter and the ray tracing algorithm to achieve error compensation of the beamsplitter were proposed. The proposed error compensation method can effectively improve the measurement accuracy of NCPMD system which has been confirmed by surface measurement experiments.

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Source
http://dx.doi.org/10.1364/OE.520849DOI Listing

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