We propose a system to detect wet surfaces using near infrared LED lighting and a conventional CCD camera. There is a sharp fall in the transmission of light through water for wavelengths longer than $920\mathrm{nm}$ . By detecting this transition it is possible to robustly detect a film of water lying on a surface. This paper considers surfaces that are impermeable, are not hydrophilic, and are sufficiently reflective (reflectivity, $\rho >0.4$ ). A system is demonstrated that can detect water on a wide range of surfaces that meet these conditions.

© 2010 Optical Society of America

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