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Measurement of the Three-Dimensional Shape of Discontinuous Specular Objects Using Infrared Phase-Measuring

Caixia Chang1,2, Zonghua Zhang3,4, Nan Gao5

  • 1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China. ccaixia@foxmail.com.

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|October 27, 2019
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Summary

This study introduces an infrared phase-measuring deflectometry (IR-PMD) method for accurate 3D shape measurement of specular objects. The novel IR-PMD technique overcomes ambient light interference and measures discontinuous surfaces effectively.

Keywords:
absolute phasefringe projectionfringe reflectioninfrared phase-measuring deflectometry (IR-PMD)specular objectsthree-dimensional (3D) shape measurement

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Area of Science:

  • Optical Metrology
  • 3D Shape Measurement
  • Surface Inspection

Background:

  • Phase-measuring deflectometry (PMD) is widely used for 3D specular object measurement.
  • Visible light PMD methods are sensitive to ambient light, affecting measurement accuracy.
  • Existing methods struggle with discontinuous surfaces and environmental interference.

Purpose of the Study:

  • To develop an infrared phase-measuring deflectometry (IR-PMD) method for robust 3D specular object measurement.
  • To establish a direct relationship between absolute phase and depth data for enhanced accuracy.
  • To enable measurement of discontinuous surfaces and overcome ambient light sensitivity.

Main Methods:

  • Proposed an infrared PMD (IR-PMD) system using IR sinusoidal fringe patterns projected onto a ground glass screen.
  • Implemented a multiple-step phase-shifting algorithm and optimum three-fringe number selection for phase data acquisition.
  • Developed a novel geometric calibration method combining fringe projection and reflection.

Main Results:

  • Successfully established a direct relationship between absolute phase and depth data for IR-PMD.
  • Demonstrated the capability to measure discontinuous specular surfaces.
  • Validated the effectiveness and accuracy of the proposed IR-PMD method through experimental results.

Conclusions:

  • The proposed IR-PMD method offers a robust solution for 3D specular object measurement, unaffected by ambient light.
  • The technique is suitable for applications in advanced manufacturing, automotive, and aerospace industries.
  • This method provides accurate and reliable 3D shape data for critical components.