numerical aperture

• 1. 孔径数: numerical aperture
• 2. 数值孔径: numerical aperture | NA | numericalapertureNA | numericing aperture
• 3. 透镜孔径数: lens aperture number

更多释义

• 1.系统各项像差系数随子孔径数的增加而降低；当子孔径数大于6时，各像差系数变化缓慢。
  The coefficients of every aberration were decreased with the increase of the number of subapertures (N), but changed slowly when N was greater than 6.
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• 2.在约束阵列孔径和阵元数的条件下，高效地实现了任意最小阵元间距约束下抑制峰值旁瓣电平(PSLL)的稀布阵综合。
  Under the optimization constraints of the number of element, the aperture and the minimum element spacing, the MGA has been utilized to reduce the peak sidelobe level (PSLL) of the array.
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• 3.作用于合成孔径雷达图像中的相干斑抑制时，不论从视觉效果还是等效视数和比值图等衡量指标上都取得了较好的效果。
  More significance, this technique is used for restraining speckle noise in synthetic aperture radar images successfully in equivalent number of looks and ratio images.
  dict.yoduao.com

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