Showing papers on "Standard test image published in 1962"
TL;DR: This chapter describes a simple laboratory instrument constructed at the Imperial College in 1961 for evaluation of image tubes for astronomical purposes, which incorporates two devices, one mechanical and the other optical to facilitate precise focusing.
Abstract: Publisher Summary This chapter describes a simple laboratory instrument constructed at the Imperial College in 1961 for evaluation of image tubes for astronomical purposes. The function of prototype instrument is to project a tiny test image with a controlled amount of light onto the photocathode of an image tube or onto a photographic plate. The features of the image and the amount of light are chosen to simulate the kinds of exposures actually encountered in astronomical practice. A box contains two light sources; one bright, and the other faint. The bright source is for visual focusing of the image tube, while the faint source is for “astronomical” test exposures. In the testing of image tubes and photographic plates, it is important that the final resolution should not be impaired by faulty optical focusing of the test image. The prototype instrument incorporates two devices, one mechanical and the other optical to facilitate precise focusing. Sample results obtained with this prototype instrument demonstrate its potential for future application.
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