基于傅里叶红外光谱的汽车车身油漆比对

为了通过事故现场遗留的车辆油漆快速排查及确定肇事逃逸车辆的车型范围，采集了287份汽车车身油漆样本，获得了940份油漆红外光谱，建立了汽车车身油漆红外光谱比对数据库。结合特征波峰法与相关系数法实现了车身油漆光谱的比对，并对不同类型油漆碎片进行了比对实验。实验结果表明：对于层次完整的油漆碎片，比对的重点是面漆层和中涂层光谱;对于不完整的油漆碎片，应层次分离后分层进行光谱检索;对于老化油漆，应以面漆层的光谱匹配为主，扩大搜索范围后综合分析搜寻嫌疑车型。

FTIR-Based Vehicles Paint Comparison

In order to determine a range on vehicle types by the vehicle paints left on the accident site, 940 infrared spectra of vehicle paint from 287 vehicle samples were collected, and then the infrared spectrum database on vehicle body paint was established. The vehicle paints comparison was implemented by characteristic peaks method and correlation coefficient method, and the comparison tests on different vehicle scrap paints were carried out. The test results show that the key of vehicle paint comparison is the spectrum of topcoat layer and the coating layer for the integrated scrap paint, and spectrum should be searched after layer separating for partial scrap paint. For aging paint, topcoat layer spectrum should be main emphasis and the range of suspect vehicle should be extended.