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在全内反射边缘照明的基础上,利用DKDP晶体的双折射特性,解决了区分DKDP晶体自身前后表面损伤的问题。紫外光入射到11 mm厚的DKDP晶体会分解为o光和e光,并在出射面产生254.738μm(理论值)的偏离量。这个偏离量导致DKDP晶体后表面损伤在CCD上成双像(一个是o光成像,另一个是e光成像),可以用偏振片对双像进行调制;DKDP晶体前表面损伤在CCD上只有单像,不受偏振调制影响。通过偏振调制,可以避免重复提取同一个损伤信息,提高损伤识别精度。实验证明:该方法可以区分厚度为11 mm的DKDP晶体前后表面损伤。
Based on the total internal reflection edge illumination, the problem of distinguishing the front and back surface damage of the DKDP crystal itself is solved by utilizing the birefringence properties of the DKDP crystal. The UV light striking an 11 mm thick DKDP crystal breaks down into o and e light and produces a 254.738 μm (theoretical) offset at the exit face. This shift causes the DKDP crystal posterior surface to be double-imaged on the CCD (one for o-light imaging and the other for e-light imaging), which can be modulated with polarizers; the front surface of the DKDP has only a single front surface damage on the CCD Like, not affected by polarization modulation. Through polarization modulation, the same damage information can be avoided repeatedly and the damage recognition accuracy can be improved. Experiments show that this method can distinguish the surface damage of DKDP crystals with a thickness of 11 mm.