Developments in electronography for astronomical research.
Abstract
In electronography light from a faint source causes a photocathode to release electrons which are accelerated and focused by electric fields and recorded on a photographic emulsion. Since every high-energy electron entering a photographic emulsion produces developable grains and there is no reciprocity failure the overall quantum efficiency depends mainly on the photocathode efficiency. Quantum efficiencies are higher than they are for photography over the entire spectral range, although the number of picture elements is lower. The development of the Royal Greenwich Observatory (RGO) camera and astronomical research conducted with it are described. Included are details on the photocathode, the mica window, the film mechanism and the insulation system and details on the research done on the Crab Nebula and Seyfert galaxies and polarization maps.
- Publication:
-
Endeavour
- Pub Date:
- 1977
- Bibcode:
- 1977Endvr...1...32M
- Keywords:
-
- Astronomical Photography;
- Electronography;
- Image Enhancement;
- Astronomical Maps;
- Astronomical Observatories;
- Crab Nebula;
- Quantum Theory;
- Seyfert Galaxies;
- Astronomy