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During oil spills, an accurate estimate of the oil-slick thickness at different locations within the affected area is an essential requirement to estimate the spilled amount, assess and enhance the performance of skimmers, and decide on the type of remediation techniques to be applied such as in situ burning. This requirement cannot be satisfied using remote sensing techniques, which can provide a global assessment of the oil spill extent but not an accurate localized estimate of its thickness, particularly for thicker oil slicks. To solve this problem, we propose a new in situ measurement system that works based on a dual-modality sensing concept, combining capacitive and ultrasonic sensors to provide accurate information about the oil-film thickness in real-time. In this article, we describe the design, implementation, and testing of the proposed system, which was realized as two different devices optimized for different …