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Spatial coherence profilometry on tilted surfaces.

Pavel Pavlicek1, Marek Halouzka, Zhihui Duan

  • 1Joint Laboratory of Optics of Palacky University, Institute of Physics of the Academy of Sciences of the Czech Republic, Tr. 17 listopadu 50a, CZ-772 07 Olomouc, Czech Republic. Pavel.Pavlicek@upol.cz

Applied Optics
|December 4, 2009
PubMed
Summary
This summary is machine-generated.

Investigating tilted surfaces in spatial coherence profilometry reveals systematic measurement errors. Understanding tilt angle and setup parameters is crucial for accurate shape measurement using this technique.

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Area of Science:

  • Optical metrology
  • Surface characterization

Background:

  • Spatial coherence profilometry is a technique for measuring surface topography.
  • Surface tilt can introduce errors in optical measurement methods.

Purpose of the Study:

  • To investigate the impact of tilted surfaces on shape measurement accuracy using spatial coherence profilometry.
  • To determine the systematic measurement error introduced by surface tilt.

Main Methods:

  • Theoretical analysis of measurement error.
  • Experimental validation of theoretical predictions.
  • Comparison with white-light interferometry.

Main Results:

  • A systematic measurement error is identified and quantified.
  • The error is dependent on both the tilt angle and experimental setup parameters.
  • Similarities and differences between spatial coherence profilometry and white-light interferometry were observed.

Conclusions:

  • Surface tilt significantly influences spatial coherence profilometry measurements.
  • Specific conditions are proposed to ensure accurate measurements.
  • Understanding error sources is key for reliable surface metrology.