Proceedings PaperElectro-Optical Sensor For Measuring Road Surface Texture
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ENSCO, Inc. is developing a sensor for the Maryland State Highway Administration that will measure road surface texture from aboard a moving vehicle. In the future this sensor will enable real-time classification of pavement texture, which enables the speed dependency of skid resistance to be determined. The sensor consists of a projector, detector, and electronic processor. The projector projects an extremely short-duration slit of light vertically downwards onto the road surface. This results in an illuminated single-line profile of the surface texture. This texture profile is detected by a vidicon camera that views the surface at a 45 degree angle. The camera image is digitized by the processor and stored on digital tape to facilitate subsequent computer processing of the texture data. The sensor system is designed to measure four-inch long samples of surface texture with a resolution of 0.01 inches at vehicle speeds up to 40 mph.