Spatially Offset Raman Spectroscopy Detection for the Concealed Components in Non-metallic Opaque and Translucent Containers

摘要

As a new type of conventional Raman spectroscopy(CRS) technology, spatially offset Raman spectroscopy(SORS) can acquire subsurface information of the multi-layered materials and realize the detection of concealed materials in non-metallic opaque and translucent containers. In this paper, the spectrum of NaNO_3 powder in a red opaque plastic bottle and a brown translucent glass bottle were detected with a 785nm SORS detection system. According to comparison and analysis, the Raman signal and fluorescence of the surface opaque HDPE container and the surface translucent glass container were suppressed by SORS. The subsurface concealed NaNO_3 Raman spectrum peak was detected successfully.