EQUATIONS FOR SCANNING IMAGING IN NEAR FIELD
近场条件下的扫描成象方程

The paper reexamined the traditional equations for scanning imaging in far field and found that it is inapplicable in near field.By the introduction of a collection coefficient equations for both far and near field have been set up.The collection coefficient has been calculated using scalar Kirchhoff model and vector Bethe Bouwkamp model respectively.It was found that the collection coefficient is proportional to the aperture diameter and it has a distribution about six times wider in Bethe Bouwkamp model than in Kirchhoff model.