Over the years, the HYCAM rotating prism camera has been accepted as the industry standard for high speed photography. The new K2A optical head represents the first major opticaldesign change since the introduction o...
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ISBN:
(纸本)0892525320
Over the years, the HYCAM rotating prism camera has been accepted as the industry standard for high speed photography. The new K2A optical head represents the first major opticaldesign change since the introduction of the K2 optics in the late 1960's. The new optical system is designed to be compatible, but not interchangeable, with the current HYCAM system. This paper documents the results of an optical system design analysis that has achieved a substantial improvement in resolution and an improvement in relative aperture without changes in the physical package, but by the combination of many small design modifications. Each of these modifications yield only modest improvements individually, but their combined effects are most significant.
作者:
Stewart, GeorgeUniv of Glasgow
Dep of Electronics & Electrical Engineering Glasgow Scotl Univ of Glasgow Dep of Electronics & Electrical Engineering Glasgow Scotl
Progress in the development of low-loss, high bandwidth, single-mode fibres for optical communication purposes has led to increased effort over the past several years into the development of integrated optical devices...
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ISBN:
(纸本)0892525037
Progress in the development of low-loss, high bandwidth, single-mode fibres for optical communication purposes has led to increased effort over the past several years into the development of integrated optical devices and systems. Active devices such as modulators, switches, polarisation controllers have been developed in lithium niobate substrates while passive devices such as junctions, power splitters, wavelength demultiplexers have been formed in glass waveguides. Interconnection of devices to form integrated systems poses special problems and two lines of approach are possible: (i) hybrid systems where devices in different materials are linked by fibres or other coupling methods (ii) monolithic systems where all devices are fabricated in a single substrate material such as GaAs or InP. Increasing effort is being directed towards iiI-V semiconductors for fabrication of lasers, detectors, waveguides and opto-electronic devices with a view to the design of monolithic integrated optic and opto-electronic systems. In addition to the use of integrated optics in communication systems, important applications are now being found in fibre-optic sensor devices.
The topic of this paper is specifically the area of transmission diffraction systems, relevant examples of which include transmission gratings and zone plates - two devices that have been fabricated as free-standing u...
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ISBN:
(纸本)089252538X
The topic of this paper is specifically the area of transmission diffraction systems, relevant examples of which include transmission gratings and zone plates - two devices that have been fabricated as free-standing ultrafine structures and tested by various experimenters in the soft x-ray range in recent years. This paper describes a general design procedure for such systems which is guaranteed to generate the optimum diffraction structure geometries for arbitrarily specified systems composed of materials of arbitrary indices of refraction. The results are seen to unify all previously disclosed results in the area of zone plate theory, and provide a sound basis on which to implement current experimental/developmental programs concerned either with fabricating more exotic diffraction structures or with maximizing or minimizing other classes of system functions in the soft x-ray range.
SUMMARYThe overall performance of any electron microscope is to a great extent determined by the electron source. For example, the current acceptance of the STEM concept is due to the stimulation provided by field emi...
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SUMMARYThe overall performance of any electron microscope is to a great extent determined by the electron source. For example, the current acceptance of the STEM concept is due to the stimulation provided by field emission sources, which made it possible to image single atoms in the *** field emission source remains the electron source with the highest brightness and the lowest energy spread. As a consequence, considerable research and engineering work has been and is still being conducted in a number of important areas. These areas include: (i) the mechanisms which determine the beam current stability; (ii) the electron‐electron interactions which lead to beam spreading and an increase of the energy spread; (iii) various types of emitters such as bare tungsten tips, oxygen processed tips, zirconium coated tips, carbon emitters, carbon coated tungsten emitters and even solid state emitters; (iv) the lifetime limiting factors, e.g. inclusions, ion bombardment and flashovers effects; (v) different types of optical systems for field emission guns, e.g. choice of magnetic and/or electrostatic lenses at high voltage potential in UHV systems, and special magnetic lenses just below the anode; (vi) field emission guns operating at higher kV's, up to 1·6 *** analytical work in the smallest possible volumes is a growing area of scientific interest, the demand for field emission sources which are reliable, easy to operate and stable will contin
Recent technology of a liquid-metal ion source makes it possible to realize maskless ion implantation with 100 nm resolution. A 100 kV implantation apparatus has been developed by using fine-focus technology of ion op...
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作者:
BARTON, GGFELDMAN, SMr. Sidney Feldman formerly with the Naval Applied Science Laboratory
is presently with the Radiation Division of the Naval Surface Weapons Center White Oak Silver Spring Maryland. He planned and supervised laboratory experiments of many optical systems for fleet evaluation several of his designs now being standard in the fleet. He received his BA degree in Physics from Brooklyn College in 1941 and majored in Physics at the Brooklyn Polytechnic Institute. His professional memberships include the Optical Society of America American Association for the Advancement of Science and The Scientific Research Society of North America. He was the recipient of the Naval Ordnance Development Award in 1945 the Superior Achievement Award in 1957 the Quality Salary Increase Award in 1965 the Superior Accomplishment Award in 1967 1970 and 1979. Additionally he has been granted patents for a relamping tool for searchlights (1962) a lamp positioning mechanism for searchlights (1963) a daylnight digital sextant (1973) a portable sextant-computer system (1974) and with Mr. George Barton the remote-controlled LLLTV camera-sextant (1976) the automatic passive LLLTV-rangefinder (1977) and a patent disclosure for the omnidirectional transceiver (1980). Mr. George G. Barton has been employed by the Naval Research Laboratory
Washington D. C. for the past ten years in the scientific and military application design engineering and fabrication of low light level TV camera systems. He was previously associated with the Smithsonian Institution and Northwestern University in the application of TV technology in astronomical investigations. He attended New York University Newark College of Engineering and New Mexico State University where he majored in Physical Optics. Presently he is with his own company BISMARC Inc. Harker's Island N.C. where he is involved principally in the design manufacture and marketing of sonar systems such as the unique VIDISEA fishscope research and development in electrooptic systems an
During periods of radio silence under Emission Control, communication depends on the slow ship-to-ship, manual-visual, 8-10 wpm Morse code signaling shutter searchlight employing the ac 1000-watt incandescent or the a...
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During periods of radio silence under Emission Control, communication depends on the slow ship-to-ship, manual-visual, 8-10 wpm Morse code signaling shutter searchlight employing the ac 1000-watt incandescent or the ac 1000-watt compact arc mercury-xenon lamp. These sources can be replaced by the dc compact arc xenon lamp to provide longer daylight ranges and highspeed (100 wpm teletype, 150 wpm Morse code, voice, etc.) communication since this source has superior brightness and the facility of considerably more rapid modulation. The excessive weight and size of the ac-dc power convertor and modulating circuitry which had prevented use of the dc xenon lamp have been overcome by developments in solid state electronics such as the rapid, high current, simmer-flash, 100 to one light output xenon lamp pulsing using the reliable, uncomplicated, low-cost silicon controlled rectifier shunt switch which could eliminate the mechanical signaling shutter. Laboratory and sea evaluations have proved the feasibility of and provided the long daylight high-speed optical communication ranges that could be attained from operation of the dc 1000-watt and 2200-watt xenon lamps at the focus of 12-inch, 18-inch searchlights and in the Fresnel lens omni-directional beacon which a command ship uses to signal all ships in a task force at once. With these advances, optical communication provides the highspeed capability of radio communication, particularly, also, with the new omnidirectional transceiver.
optical methods for particle size distribution measurements in practical high temperature environments are approaching feasibility and offer significant advantages over conventional sampling methods. The present paper...
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optical methods for particle size distribution measurements in practical high temperature environments are approaching feasibility and offer significant advantages over conventional sampling methods. The present paper begins by summarizing user requirements for research and on-line particle measurements in fossil fuel systems. The principles of single particle counter (SPC) design are outlined followed by a discussion of practical instrument design constraints. Three instrument design concepts currently being developed at Sandia are then discussed. An overview of these current methods and other instrument designs is presented with particular emphasis on capabilities to meet user ojectives. Validation and long term testing of these new concepts is considered to be the final important step in achieving user acceptance of in situ optical counters.
The proceedings contain 68 papers. The topics discussed include: distributed computing for opticaldesign;current status of the synthesis of optical systems (SYNOPSYS) lens design program;new developments in CODE V op...
The proceedings contain 68 papers. The topics discussed include: distributed computing for opticaldesign;current status of the synthesis of optical systems (SYNOPSYS) lens design program;new developments in CODE V optimization;opticaldesign programs at imperial college;opticaldesign using small dedicated computers;dedicated minicomputers in opticaldesign;consideration for minicomputer applications to large opticaldesign programs;microcomputers and opticaldesign;easy to use optical program for commodore PET computer;new approach to the optimization of lens systems;ten years of lens design with Glatzel's adaptive method;aberration balancing criterion for nondiffraction-limited lenses;and application of Zernike polynomial lens sensitivity program ZEST to optimizing a lens design.
Recent advances in sensor technology present a heretofore unobtainable opportunity to collect and process imagery in a real or near-real time mode. Since this imagery is transmitted and displayed in a digital format, ...
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A design for an optical general purpose digital computer is presented. The basic approach involves decomposing the structure of a classical finite state machine into a logic unit, an interconnection array, and a latch...
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