Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986space...2...29m&link_type=abstract
Space (ISSN 0267-954X), vol. 2, Mar.-May 1986, p. 29, 30, 32, 34, 35.
Astronomy and Astrophysics
Astronomy
Image Intensifiers, Photomultiplier Tubes, Telescopes, Cameras, Dynodes, Gamma Ray Observatory, Hubble Space Telescope, Planetary Systems, Space Commercialization, Spaceborne Astronomy
Scientific paper
The Space Telescope, to be taken by the SS into orbit, represents NASA's most ambitious project yet. The ST will have an 8-ft mirror, and unaided, will detect objects as faint as magnitude 27-28, while simultaneously allowing 24 hr viewing. ST components such as the photomultiplier tube (PMT), the image intensifier tube (IIT) and the image photon counting system (IPCS) are discussed in detail together with other applications derived from these components. The PMT is comprised of a photosensitive cathode deposited on a collector face, an amplifier and an anode, all enclosed in an evacuated glass envelope. A photon arriving at the cathode triggers the release of electrons which pass into the amplifier; this light is multiplied up to 10 million times. While the PMT is a quantifier, the IIT is an imager, building its image through photon signal amplification over multiple channels, each corresponding to a specific element of the image. The IPCS has been employed by the British (as their contribution to the ST) to detect star companions and planetary systems among the 2,000 nearby stars. Other significant undertakings which incorporate these techniques include gamma ray observation, star mapping and investigation of both the sun and sea.
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