基于太赫兹偏振成像的砗磲材料检测

太赫兹波由于其所在波谱位置的特殊性，具有穿透性高，能量低，对极性分子敏感，对非金属非极性材料友好等特性，在无损检测、安全监测方面具有独特优势。利用太赫兹时域光谱成像系统，通过改变入射与探测光的偏振方向，对包含槽型缺陷的砗磲样品进行不同偏振方向的成像实验。由于砗磲材料本身透过率不高，色散较大，传统的直接成像结果无法分辨，难以达到预期效果。通过引入琼斯矢量和琼斯矩阵概念，对偏振成像结果再处理，可进一步提高成像效果。结果表明，此方法对所含缺陷的边缘信息十分灵敏，可以有效地提高砗磲材料成像结果的分辨力。

Nondestructive testing of tridacna material based on terahertz polarization imaging

Terahertz wave has unique advantages in nondestructive testing and safety monitoring because of its special spectral position, penetration, low energy, sensitivity to polar molecules and friendliness to nonpolar materials. In this experiment, terahertz time-domain spectroscopic imaging system is utilized to image tridacna samples with slot defects by changing the polarization direction of incidence and detection. Due to the low transmittance and large dispersion of the tridacna material, the traditional direct imaging results cannot be distinguished, and it is difficult to achieve the desired results. The polarization imaging results are reprocessed by introducing the concept of Jones vector and Jones matrix. The results show that this method is very sensitive to the edge information of the defect and can effectively improve the resolution of the imaging results of the tridacna material.