可见光波段的矿石多角度反射偏振特性研究

为了研究矿石的多角度偏振反射特性，采用改变光源入射角和探测角的方法，测量矿石在可见光波段的反射偏振光谱，并进行了理论分析和实验验证。结果表明，矿石的偏振度在可见光波段受波长影响较小，偏振度大小稳定，而入射角和探测角对矿石的偏振度光谱影响显著；随着入射角和探测角的增大，矿石均表现出先增大后减小的趋势，最大值出现在布儒斯特角附近；当入射角和探测角在55°~65°范围变化时，矿石偏振度差异显著，其中因组成颗粒较小结晶程度较高的玉髓偏振特性最强，而非晶质结构的蛋白石偏振特性最弱。该研究利用偏振度对矿石进行鉴别和分类，具有一定的可实行性，这为矿石检测提供了新的途径。

Study on multiangular reflectance polarization characteristics of mineral in visible light waveband

In order to research multiangular reflectance polarization characteristics of minerals, the reflectance polarization spectrum of minerals in visible light waveband was measured by the method of changing the incident angle and detection angle. After theory analysis and experimental verification, the results show that the degree of polarization ( DOP) of minerals is less affected by wavelength in visible light region, and DOP is stable. Incident angle and detection angle have significant influence on polarization spectrum. With the increase of incident angle and detection angle, DOP firstly increases and then decreases. The maximum angle is nearing Brewster angle. DOP of minerals have great differences when incident angle and detection angle vary between 55°and 65°. DOP of chalcedony is significantly higher than the other three minerals. DOP of chalcedony with smaller particles and higher crystallinity is the highest and DOP of opal with amorphous structure is the smallest. The study is feasible and reliable to identify and classify minerals by the degree of polarization and provides new way for minerals detection.