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Detecting wet surfaces using near infrared lighting.

G McGunnigle1

  • 1Carinthian Tech Research AG, CTR AG, Europastrasse 4/1, 9524 Villach, Austria. gerald.mcgunnigle@ctr.at

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 8, 2010
PubMed
Summary

This study presents a system for detecting wet surfaces using near-infrared light and a CCD camera. The method leverages water

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Area of Science:

  • Optoelectronics and Sensor Technology
  • Surface Science and Engineering

Background:

  • Accurate detection of wet surfaces is critical in various industrial and environmental monitoring applications.
  • Existing methods may lack robustness or applicability across diverse surface types.

Purpose of the Study:

  • To develop and demonstrate a novel system for reliable wet surface detection.
  • To utilize the optical properties of water in the near-infrared spectrum for detection.

Main Methods:

  • Employing near-infrared (NIR) LED illumination.
  • Utilizing a standard CCD camera for image acquisition.
  • Exploiting the sharp decrease in light transmission through water above 920 nm.

Main Results:

  • The system successfully detects water films on various impermeable, non-hydrophilic, and reflective surfaces (reflectivity > 0.4).
  • The method demonstrates robustness by identifying the specific spectral transition characteristic of water.

Conclusions:

  • The proposed NIR-based system offers a robust and effective solution for detecting wet surfaces.
  • This technology is suitable for applications requiring reliable wetness monitoring on suitable surface types.

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