| 利用方形环孔中心遮拦比调节远场光谱移动实现信息传递 |
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| 引用本文： | 王筠,谷亭亭.利用方形环孔中心遮拦比调节远场光谱移动实现信息传递[J].培训与研究,2014(2):15-18. |
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| 作者姓名： | 王筠 谷亭亭 |
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| 作者单位： | [1]湖北第二师范学院物理与机电工程学院,武汉430205 [2]湖北第二师范学院数学与统计学院,武汉430205 |
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| 基金项目： | 湖北省教育厅科学技术计划指导性项目（B2013021） |
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| 摘 要： | 根据惠更斯-菲涅尔原理,推导得到多色完全空间相干光在方形环孔衍射远场的光谱分布表示式,并进行了详细的数值分析.结果表明,远场的光谱分布受到方形环孔中心遮拦比和场点位置坐标的共同调制,观察屏上平行于方形环孔边长的x或y轴上以及与x轴成45°角的斜直线上,光谱开关数目随方形环孔中心遮拦比和场点到观察屏中心距离的增大而增加,与x轴成任意角的斜直线上的光谱移动呈无规则分布.因此,可以通过改变孔径遮拦比调节观察屏x或y轴上、与x轴成45°角的斜直线上的光谱移动实现光信息的传递.
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| 关 键 词： | 多色空间相干光 方形环孔中心遮拦比 光谱开关 |
Central Obstruction Ratio of Square Loop Hole for Adjustment of Far Field Spectral Shift in Information Transmission |
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| WANG Yun,GU Ting-ting.Central Obstruction Ratio of Square Loop Hole for Adjustment of Far Field Spectral Shift in Information Transmission[J].Training and Research-Journal of Hubei College of Education,2014(2):15-18. |
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| Authors: | WANG Yun GU Ting-ting |
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| Institution: | 1. School of Physics and Electronic Information, Hubei University of Education, Wuhan 430205, China; 2. School of Mathematics and Statistics, Hubei University of Education, Wuhan 430205, China) |
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| Abstract: | According to the Huygens-Fresnel principle in the paraxial domain, an expression for the spectrum of spatially polychromatic coherent light diffravted by an Square annular aperture in the far field is derived, and detailed numerical calculations are performed. It is shown that the spectral distribution of the far field is dependent of the central obstruction ratio of square loop hole and field point position coordinates. The spectrum on the x or y axis parallel to the side length of square loop hole are the same, and with the increase of the square loop hole central obscuration ratio and the distance of field point to the center of the viewing screen, the number of spectral switch are increased. The number of the spectral switches on the oblique straight line with the x axis angle of 45~ in the viewing screen are increased exponentially with the increase of the distance of field point to the center of the viewing screen. The spectral shift on inclined straight line of arbitrary angle of the X axis are irregularly distributed. Therefore, by changing the aperture obseuration ratio to con- trol spectral shift of x or y-axis or 45 o the oblique line on a viewing screen may achieve optical information transmission. |
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| Keywords: | polychromatic spatially coherent light central obstruction ratio of square loop hole spectral switches |
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