APPLIED RESEARCH ON HIGH RESOLUTION CAMERA TUBES.
Abstract
In order to achieve the desired resolution and signal-tonoise ratio, tubes with vidicon photoconductive targets were built with the required 2 in x 2 in image area. Photoconductive targets typically achieve the 40 db signal-to-noise ratio and give 2000 TV lines at 50% response. In addition, when a suitable distribution of magnetic focus field is used there is very little reduction of resolution from the center to the corners of the image and furthermore, no dynamic focus modulation is required. It was found that the vidicon tubes with field mesh and uniform potential within the deflection space are the most satisfactory even in spite of the fact that some degradation of resolution, due to the 1000 line-per-inch mesh, is present. A study was made of the magnetic focus and deflection fields and of the path of beam under various focus field configurations and deflection amplitudes. A start was made toward computer calculation of beam aberrations in the measured field distributions. Although additional work was done toward plug-type integral mesh targets, the improvements made were not sufficient to make these targets practical. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 08, 1964
- Accession Number
- AD0602425
Entities
People
- A. Rotow
- B. H. Vine
- O. H. Schade Sr.