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Author: Ramon U. Martinelli Publisher: ISBN: Category : Languages : en Pages : 55
Book Description
The development of III-V SIT tubes has progressed. Successful work has been performed on both Si and GaAs transmission secondary emission (TSE) dynodes. Gains of 200 at 10 keV have been seen with Si dynodes. Accompanying every Si activation to negative electron affinity (NEA), however, are large thermionic emission densities of about 10 to the minus 10th power amps per sq cm. Gains of 112 at 20 keV have been seen with GaAs TSE dynodes, and GaAs promises to be a very suitable material. Dark currents from GaAs are 10 to the minus 15th power amps per sq cm which presents no problem. Two prototype proximity focused III-V SIT tubes have been made, showing limiting resolution at 350 TV lines. These tubes demonstrate the feasibility of the proposed development program. Present III-V semi-transparent photocathode sensitivities are>0.5% at 1.06 microns, and an exploration has begun to discover means of incorporating these photocathodes into image intensifier tubes. (Author).
Author: Ramon U. Martinelli Publisher: ISBN: Category : Languages : en Pages : 55
Book Description
The development of III-V SIT tubes has progressed. Successful work has been performed on both Si and GaAs transmission secondary emission (TSE) dynodes. Gains of 200 at 10 keV have been seen with Si dynodes. Accompanying every Si activation to negative electron affinity (NEA), however, are large thermionic emission densities of about 10 to the minus 10th power amps per sq cm. Gains of 112 at 20 keV have been seen with GaAs TSE dynodes, and GaAs promises to be a very suitable material. Dark currents from GaAs are 10 to the minus 15th power amps per sq cm which presents no problem. Two prototype proximity focused III-V SIT tubes have been made, showing limiting resolution at 350 TV lines. These tubes demonstrate the feasibility of the proposed development program. Present III-V semi-transparent photocathode sensitivities are>0.5% at 1.06 microns, and an exploration has begun to discover means of incorporating these photocathodes into image intensifier tubes. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 127
Book Description
In the document the mechanical configuration and the electrical operation of a low light level TV scanning image tube which incorporates high optical gain and image storage is described. The physical phenomena associated with these properties are described. From analytical descriptions of the phenomena, a mathematical model is developed. The computer program implementations of the model provide economical tools for overall system design considerations. These implementations of the model are flexible enough to encompass all sensor tube characteristics and their operating modes conceivable at this time. Where sufficiently accurate tube and operating parameters were available, comparisons of the model performance with experimental data showed very good quantitative agreement.
Author: Publisher: ISBN: Category : Research Languages : en Pages : 1610
Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author: A. G. Wright Publisher: Oxford University Press ISBN: 0199565090 Category : Business & Economics Languages : en Pages : 639
Book Description
"Photomultipliers are extremely sensitive light detectors with the capability to detect single photons. In multiplying the charge produced by incident light by up to 100 million times, these devices are essential to a wide range of applications, from medical instrumentation to astronomical observations. This complete and authoritative guide will provide...a deeper understanding of the operating principles of these devices." -- Publisher's description, back cover.
Author: A.K. Suri Publisher: Routledge ISBN: 1351448978 Category : Science Languages : en Pages : 272
Book Description
The growth and development witnessed today in modern science, engineering, and technology owes a heavy debt to the rare, refractory, and reactive metals group, of which niobium is a member. Extractive Metallurgy of Niobium presents a vivid account of the metal through its comprehensive discussions of properties and applications, resources and resource processing, chemical processing and compound preparation, metal extraction, and refining and consolidation. Typical flow sheets adopted in some leading niobium-producing countries for the beneficiation of various niobium sources are presented, and various chemical processes for producing pure forms of niobium intermediates such as chloride, fluoride, and oxide are discussed. The book also explains how to liberate the metal from its intermediates and describes the physico-chemical principles involved. It is an excellent reference for chemical metallurgists, hydrometallurgists, extraction and process metallurgists, and minerals processors. It is also valuable to a wide variety of scientists, engineers, technologists, and students interested in the topic.
Author: Maurice G. Burnett Publisher: ISBN: Category : Artificial satellites, American Languages : en Pages : 386
Book Description
The United States developed the Gambit and Hexagon programs to improve the nation's means for peering over the iron curtain that separated western democracies from east European and Asian communist countries. The inability to gain insight into vast "denied areas" required exceptional systems to understand threats posed by US adversaries. Corona was the first imagery satellite system to help see into those areas. Hexagon began as a Central Intelligence Agency (CIA) program with the first concepts proposed in 1964. The CIA's primary goal was to develop an imagery system with Corona-like ability to image wide swaths of the earth, but with resolution equivalent to Gambit. Such a system would afford the United States even greater advantages monitoring the arms race that had developed with the nation's adversaries. The Hexagon mapping camera flew on 12 of the 20 Hexagon missions. It proved to be a remarkably efficient and prodigious producer of imagery for mapping purposes. The mapping camera system was successful by every standard including technical capabilities, reliability, and capacity.
Author: Ramon U. Martinelli
Author: Ramon U. Martinelli
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Author: A. G. Wright
Author: A.K. Suri
Author: Maurice G. Burnett
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