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Poisson斑的中心可以在很长的距离内保持与轴心共线因而能实现高精度的对心瞄准，这一技术被称为Poisson线技术.利用数值模拟和实验验证对Poisson线瞄准技术进行了初步研究.通过数值模拟发现，Poisson线上的光强随着离圆屏距离的增加而增大；Poisson斑直径随着圆屏直径增加而减小、随着距离增加而增加；其方向平行于入射激光束并过圆屏中心（待瞄准点）.Poisson线对圆屏的倾斜非常不敏感，但是对中心的偏移非常敏感.模拟中发现Poisson线对10 μm的中心偏移敏感，初步实验验证Poisson线可实现50 μm的对心误差调节.Poisson line technique is a method of generating a straight line by diffraction for high precision alignment，which can keep the center of Poisson spot in this line at long distances (several tens or hundreds of meters). Numerical simulation and experimental demonstration are proposed to research this technique. The intensity of the line increases asymptotically to the incident intensity as distance from the disk increases. The diameter of the line increases as the distances from the disk increases. Whereas it decreases as the diameter of the disks increases. The direction of the line is parallel to laser beam and propagates through the center of the disk，which is sensitive to center excursion and insensitive to the incline of the disk. Poisson line is sensitive to 10 μm excursion in simulation. And Poisson line technique can adjust 50 μm center excursion at long distance in experimental demonstration.
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Keywords:
- neutron imaging /
- Poisson line /
- Fresnel diffraction
[1] ［1］Harvey J E，Forgham J L 1984 Am. J. Phys. 52 243
[2] ［2］Griffith L V 1990 Rev. Sci. Instrum. 61 2138
[3] ［3］Ress D，Lerche R A，Ellis R J，Lane S M，Nugent K A 1988 Science 241 956
[4] ［4］Disdier L，Rouyer A，Wilson D C，Fedotoffa A，Stoecklc C，Bourgade J L，Glebov V Y，Garonnet J P，Seka W 2002 Nuc. Instrum. Meth. Phys. Res. A 489 496
[5] ［5］Disdier L，Rouyer A，Fedotoff A，Bourgade J L，Marshall F J，Glebov V Y，Stoeckl C 2003 Rev. Sci. Instrum.74 1832
[6] ［6］Grim G P，Morgan G L，Wilke M D，Gobby P L，Christensen C R，Wilson D C 2004 Rev. Sci. Instrum. 75 3573
[7] ［7］Disdier L，Rouyer A，Lantuéjoul I，Landoas O，Bourgade J L，Sangster T C，Glebov V Y，Lerche R A 2006 Phys. Plasmas 13 056317
[8] ［8］Lerche R A，Izumi N，Fisher R K，Disdier L，Bourgade J L，Rouyer A，Jaanimagi P A，Sangster T C 2003 Rev. Sci. Instrum. 74 1709
[9] ［9］Chen Y W，Kodama R，Nakao Z 1998 IEEE Trans. Nucl. Sci. 45 992
[10] ］Chen F X，Zheng J, Yang J L 2006 Acta Phys. Sin. 55 5947 (in Chinese) ［陈法新、郑坚、杨建伦 2006 55 5947］
[11] ］Zhao Z Q，Ding Y K，Dong J J，Hao Y D，Wu S C，Cao L F，Pu Y K 2007 Plasma Phys. Control. Fusio 49 1145
[12] ］Zhao Z Q，Ding Y K，Hao Y D，Yuan Y T，Pu Y K 2008 Acta Phys. Sin. 57 5756 (in Chinese) ［赵宗清、丁永坤、郝轶聃、袁永腾、蒲以康 2008 57］
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[1] ［1］Harvey J E，Forgham J L 1984 Am. J. Phys. 52 243
[2] ［2］Griffith L V 1990 Rev. Sci. Instrum. 61 2138
[3] ［3］Ress D，Lerche R A，Ellis R J，Lane S M，Nugent K A 1988 Science 241 956
[4] ［4］Disdier L，Rouyer A，Wilson D C，Fedotoffa A，Stoecklc C，Bourgade J L，Glebov V Y，Garonnet J P，Seka W 2002 Nuc. Instrum. Meth. Phys. Res. A 489 496
[5] ［5］Disdier L，Rouyer A，Fedotoff A，Bourgade J L，Marshall F J，Glebov V Y，Stoeckl C 2003 Rev. Sci. Instrum.74 1832
[6] ［6］Grim G P，Morgan G L，Wilke M D，Gobby P L，Christensen C R，Wilson D C 2004 Rev. Sci. Instrum. 75 3573
[7] ［7］Disdier L，Rouyer A，Lantuéjoul I，Landoas O，Bourgade J L，Sangster T C，Glebov V Y，Lerche R A 2006 Phys. Plasmas 13 056317
[8] ［8］Lerche R A，Izumi N，Fisher R K，Disdier L，Bourgade J L，Rouyer A，Jaanimagi P A，Sangster T C 2003 Rev. Sci. Instrum. 74 1709
[9] ［9］Chen Y W，Kodama R，Nakao Z 1998 IEEE Trans. Nucl. Sci. 45 992
[10] ］Chen F X，Zheng J, Yang J L 2006 Acta Phys. Sin. 55 5947 (in Chinese) ［陈法新、郑坚、杨建伦 2006 55 5947］
[11] ］Zhao Z Q，Ding Y K，Dong J J，Hao Y D，Wu S C，Cao L F，Pu Y K 2007 Plasma Phys. Control. Fusio 49 1145
[12] ］Zhao Z Q，Ding Y K，Hao Y D，Yuan Y T，Pu Y K 2008 Acta Phys. Sin. 57 5756 (in Chinese) ［赵宗清、丁永坤、郝轶聃、袁永腾、蒲以康 2008 57］
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