中文摘要：

现有结冰探测器多为接触式传感器,只能对单个点进行检测,且安装维护复杂。因此,提出了一种非接触式的路面状态探测方法。该方法采用近红外石英卤钨灯照明,通过旋转偏振片依次采集4个偏振方向分量图片,进而计算出线偏振度,识别出路面状态（如结冰、潮湿和干燥）。实验结果表明：路面处于结冰状态时,线偏振度较大,潮湿状态时较小,干燥状态时最小。该方法原理简单,易于实现,且识别3种不同状态的准确率高于90%。

英文摘要：

Most of the existing ice detectors are contacted, which can only monitor one single point and its installation and maintenance are very complex.Therefore,a non-contact road condition detection method was proposed.This method adopted near infrared quartz tungsten-halogen light to illuminates, pictures of components in four directions were acquired through rotating the polaroid and then degree of linear polarization was calculated and road surface conditions were recognized, such as freeze, wet and dry.The experimental results show that when the road freeze, degree of linear polarization is large.While in humid condition, degree of linear polarization is small.While in dry condition, degree of linear polarization is smallest.This method has simple principle, easy to implement and with accuracy more than 90% in 3 different conditions.