Optical Road Surface Friction Estimation
Multi-spectral near-infrared (NIR) backscatter sensors distinguishing dry asphalt, standing water, slush, packed snow, and invisible black ice.
Black Ice Spectral Discrimination
Differential absorption at 1310nm (water peak) versus 1550nm (ice crystallization state) outputs a reliable pavement friction coefficient within 5 milliseconds, enabling preemptive ABS threshold adjustment.
- Water film thickness resolution down to 10 micrometers.
- Instantaneous distinction between wet asphalt, slush, packed snow, and black ice.
- Sampling rate exceeding 500 Hz for continuous high-speed road scanning.
- Direct output of estimated friction coefficient (mu: 0.1 to 0.95).
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