波罗的海琥珀的红外全息成像研究初探

Preliminary Study on Infrared Holographic Imaging of Amber from the Baltic Sea

为探究琥珀的光学特性与成分之间的联系,进一步建立琥珀真伪辨识的有效红外参数,利用红外全息术对5块波罗的海琥珀样品进行了成像探测,通过显微镜、X射线荧光光谱术辅助解析成像效果。根据红外全息原理,利用近红外激光光源搭建平行光立式拍摄光路,获取了琥珀样品不同位置的全息图并进行重建,图像显示琥珀样品的不同位置成像效果具有差异。针对琥珀样品的不同位置对红外波段透过率差异的情况,进行X射线荧光光谱分析,获得其不同位置的元素含量,并结合红外全息成像结果,分析得出S元素和Si元素是影响琥珀红外透过率的主要元素,含有包裹体的位置比不含包裹体位置的所含S元素含量低,含有包裹体的位置比不含包裹体位置的所含Si元素含量高,Si元素有利于红外透过,S元素不利于红外透过。研究表明,立式平行光拍摄光路适合于琥珀红外全息成像,是一种新型琥珀表征光学工具。

In order to explore the relationship between the optical properties and composition of amber and further establish the effective infrared parameters of amber authenticity identification, infrared holographic method was used to image and detect 5 amber samples from the Baltic Sea, and the imaging effect was analyzed by microscope and X-ray fluorescence spectroscopy. According to the principle of infrared holography, the parallel light vertical shooting optical path is built by using the near-infrared laser light source, and the hologram of different positions of the amber sample is obtained and reconstructed, and the image shows that the imaging effect of the amber sample at different locations has differences. For the difference in the infrared band transmittance of the amber sample at different locations, X-ray fluorescence spectroscopy was performed to obtain the elemental content at different locations. Combined with the infrared holographic imaging results, the analysis showed that S element and Si element were the main elements affecting the infrared transmittance of amber, and the content of S element of the testing points with inclusion was lower than that without inclucion, and the content of Si element of the testing point with inclusion was higher than that without inclusion. It was concluded that the Si element was conducive to infrared transmission, and the S element was not conducive to infrared transmission. Studies have shown that the optical path of vertical parallel light shooting is suitable for amber infrared holographic imaging, which is a new optical tool for amber characterization.