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Development of a Wide Area Optical Surface Contamination Detection System for Public Transportation Application. Final rept. Sep 01-Feb 03.
| 题名： | Development of a Wide Area Optical Surface Contamination Detection System for Public Transportation Application. Final rept. Sep 01-Feb 03. |
| 作者： | Schmokel-P. |
| 关键词： | *Optical-measurement; *Detection-; *Road-surfaces; *Ice-.;Snow-; Pavement-; Polarization-; Reflection-; Wet-surfaces; Range-performance; Concrete-; Asphalt-. |
| 摘要： | This project developed and tested a laser-based remote sensing technology for detecting ice on road surfaces. The system is an adaptation of a wide area ice detection system (IceHawk) that utilizes laser polarization properties and has been applied successfully to detect ice on typical aircraft surfaces. The work involved analysis of target materials, improving range performance and detection of wet surfaces. A system requirement document was generated based on initial testing and analysis. The existing IceHawk system was modified to allow for stationary mount and remote operation. Target materials (concrete, asphalt, etc.) were evaluated for polarization reflection behavior. Test data collected during winter was used to improve and refine the system. Initial results showed the adaptability of a station pole mounted IceHawk system to detect ice and snow on roadway surfaces. Test results showed a distinguishable difference between a clean surface and that covered with snow or ice. Data was gathered to determine the minimum thickness threshold settings for ice, snow and wet roadway conditions. In addition, pixel-filtering technique was evaluated to determine the ice, snow and wet area criteria necessary to alert the operator of unacceptable conditions. Work on range improvement enhanced the signal to noise ratio and led to an increase of 25 percent in the detection range for ice, snow and wet surface. Additional improvements involved creating larger collecting optics and increasing the amount of light energy delivered to the photodetector. Further research, development and testing will be needed before the technology can be applied to the highways. |
| 报告类型： | 科技报告 |
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