Optical Review

, Volume 14, Issue 6, pp 362–364

Monitoring of Paint Drying Process by Digital Speckle Correlation

Authors

    • Department of Electronic EngineeringFaculty of Engineering, Gunma University
  • Masayuki Yokota
    • Department of Electronic EngineeringFaculty of Engineering, Gunma University
  • Takasi Ida
    • Department of Electronic EngineeringFaculty of Engineering, Gunma University
  • Mizuki Sunaga
    • Department of Electronic EngineeringFaculty of Engineering, Gunma University
  • Koichi Kobayashi
    • Toyo Seiki Seisaku-sho, Ltd.
Letters

DOI: 10.1007/s10043-007-0362-0

Cite this article as:
Yamaguchi, I., Yokota, M., Ida, T. et al. OPT REV (2007) 14: 362. doi:10.1007/s10043-007-0362-0

Abstract

The state of drying paint is monitored from the dynamic behaviors of the speckle pattern arising from laser illumination of the region inspected. Temporal variation of the peak height of the cross-correlation function between successive frames taken with a fixed interval is plotted until the peak maintains a stationary maximum value. We used a speckle pattern in the diffraction field for monitoring of a single region and that in the image field for simultaneous monitoring of various regions. Both the normal and the phase-only algorithms were compared for cross-correlation computation. The former showed more distinct variation of peak height.

Key words

digital speckle correlation paint drying process noncontact

Copyright information

© The Optical Society of Japan 2007