基于傅里叶变换中红外光声光谱的污渍鉴定

Identification of Dust Source Using Fourier Transform Mid-Infrared Photoacoustic Spectroscopy

采用中红外光声光谱,对一起交通事故中当事人身上的污渍和当事货车上的尘土样本进行定性鉴定。结果表明,当事人左手肘部的污渍与身体其他部位的污渍明显不同,但与当事货车右车身上的污尘具有高度的相似性,表明当事人的左肘与当事货车的右车身发生了直接的碰擦,这为交通事故的定责提供了直接依据;因此,红外光声光谱可为中微量物质的精细鉴定提供了新手段,在物证分析中具有潜在的应用前景。

The dust samples from concerned person and van in a traffic accident were identified using Fourier transform mid-infrared photoacoustic spectroscopy. The results showed that the dust spectra from the left elbow was significantly different from other locations, but was significant similar to the dust in the right side of the concerned van, which directly verified that contact occured between the concened person and van, and it provided direct evidence to allocate the responsibility in this traffic accident. Therefore, Fourier transform mid-infrared photoacoustic spectroscopy can be applied in micro analysis, which provides an alternative method in evidence analysis.