A STUDY OF THE WIRE-GRID LENS
Abstract
A study is presented of some of the problems that are of importance in the design of a wire-grid lens of the circularly symmetric type. The first problem investigated is that of a double-wire square-mesh grid which will very often be used near the rim of the lens to keep the grid-to-grid spacing suitably small. Design formulas for the quasi-static equivalent dielectric constant of such grids have been derived. The validity of these formulas was tested experimentally. Another problem that was investigated is that of synthesizing the index of refraction in a circularly symmetric lens when the index of refraction is specified in part of the lens and when it is required that the rays leaving the lens must form a collimated beam in as large an aperture as possible. Design formulas representing the solution of this problem have been derived. These formulas are most useful for wire-grid lens designs because the grid-to-grid spacing in the outer part of the lens is often determined by mechanical considerations rather than by electrical considerations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1962
- Accession Number
- AD0296364
Entities
People
- M. G. Anreasen
Organizations
- Control Data Corporation