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Electron Bombardment Induced Conductivity Including its Application to Ultra-violet Imaging in the Schuman Region

Elsevier Science & Technology
DOI: 10.1016/s0065-2539(08)61156-7
  • Design
  • Physics


Publisher Summary This chapter discusses application of electron bombardment induced conductivity to ultraviolet imaging in the Schuman region. In the well-known vidicon, conductivity in the dielectric is produced by the interaction of photons with the material. It has been shown that quantum yields for materials suitable for photoconductive camera tubes with space charge limited dark currents cannot exceed unity with present television standards and acceptable response times. While quantum yields approaching unity have been achieved in vidicons, the actual yields experienced in practice are about 0.2. Conductivity effects induced in dielectrics by bombarding electrons (Ebicon principle), rather than by photons (vidicon principle), suggest schemes whereby the practical sensitivity can be increased by several orders of magnitude. A group of ultraviolet sensitive Ebicons has been developed for use in rocket and satellite experiments to map the sky with broad-band television photometers in three spectral regions. This work is known as Project Ceiescope and has been organized by the Astrophysical Observatory of the Smithsonian Institution to initiate, design, and operate the Observatory's program of observational astrophysics from space.

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