Automatic photometer scan and data system Final report
Development and construction of automatic photometer scan and data system
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Lunar differential flux scans at 22 microns Final report
Nighttime lunar surface differential flux scans at 22 microns
Low, F. J.↗
Coded scanning of optical images
Coded mask for improved signal to noise ratio in scanning optical systems
Helm, H. A.↗
Design of a scanning laser radar for spaceborne applications, phase 3
Design of scanning laser radar for spaceborne applications
Flom, T.↗
Scanning electron microscopy of the organ of Corti
Cochlear sensory epithelium and Corti organ degeneration after noise exposure in guinea pigs and cats, using scanning electron microscopy
Ades, H. W.↗
An X-ray scan of the galactic plane from Uhuru
Galactic plane X ray scan by NASA small astronomy satellite Uhuru, discussing satellite instrumentation, detector and sensor sensitivity and preliminary measurements
Giacconi, R.↗
Method of improving the SNR of an image dissector for use in an electronic scanning spectrometer
Image intensifier tube coupled to smoothing dissector to improve SNR in electronic scanning spectrometer
Eberhardt, E. H.↗
Effect of radiometric errors on accuracy of temperature-profile measurement by the spectral-scanning method
Spectral scanning method for determining temperature profile of jet- or rocket-engine exhaust stream by gas radiation and transmittance measurements, discussing radiometric errors effects
Buchele, D. R.↗
An eye-point-of-regard system for use in scanning and display research
Eye-point-of-regard system including eye and head movements devices and analog computer for pilot scanning and display research
Jex, H. R.↗
Infrared spectrum of gaseous CF2 by rapid scan spectroscopy
Flash photolysis produced gaseous carbon difluoride IR spectrum analysis by rapid scan IR spectroscopy
Lefohn, A. S.↗
ITOS meteorological scanning radiometer
ITOS meteorological satellite scanning radiometer using point detector optical system for earth imaging
Barncastle, L.↗
Projections of scan patterns on human retina
Fundus camera tracks eye movements by using camera optics with the aid of an inverted system. Camera provides a flying-spot circular scanning light source in the normal film plane and a broadband photodetector in position normally occupied by light source.
Kelly, D. H.↗
Scanning technique for tracking small eye-movements
Scanning technique images spot of blue light on fundus, measures variations in reflectance of spot and compares reflectance pattern with a stored reference pattern. Method then converts the difference from stored pattern into infrared eye motion.
Kelly, D. H.↗
Optical device for producing color line scan display from monochrome oscilloscope traces
Novel device allows generation of simultaneous color line scan from the face of a monochrome cathode ray tube. Device consists of four dichroic beam splitters, two each of red reflectance (cyan transmittance) and blue reflectance (yellow transmittance).
Kopia, L. P.↗
A scanning mirror system for the Apollo telescope mount ultraviolet spectroheliometer
The scanning mirror system described is being developed as the primary mirror in the spectroheliometer. The system consists of a gimbaled mirror mount that is rotated through extremely small angles by the use of frictionless pivots and a closed-loop servo system. Design, fabrication, and test experience are discussed.
Highman, C. O.↗
Fretting wear in titanium, Monel-400, and cobalt 25-percent-molybdenum using scanning electron microscopy
Damage scar volume measurements taken from like metal fretting pairs combined with scanning electron microscopy observations showed that three sequentially operating mechanisms result in the fretting of titanium, Monel-400, and cobalt - 25-percent molybdenum. Initially, adhesion and plastic deformation of the surface played an important role. This was followed after a few hundred cycles by a fatigue mechanism which produced spall-like pits in the damage scar. Finally, a combination of oxidation and abrasion by debris particles became most significant. Damage scar measurements made on several elemental metals after 600,000 fretting cycles suggested that the ratio of oxide hardness to metal hardness was a measure of the susceptibility of a metal to progressive damage by fretting.
Bill, R. C.↗
Feasibility study of scanning celestial Attitude System (SCADS) for Earth Resources Technology Satellite (ERTS)
The feasibility of using the Scanning Celestial Attitude Determination System (SCADS) during Earth Resources Technology Satellite (ERTS) missions to compute an accurate spacecraft attitude by use of stellar measurements is considered. The spacecraft is local-vertical-stabilized. A heuristic discussion of the SCADS concept is first given. Two concepts are introduced: a passive system which contains no moving parts, and an active system in which the reticle is caused to rotate about the sensor's axis. A quite complete development of the equations of attitude motions is then given. These equations are used to generate the true attitude which in turn is used to compute the transit times of detectable stars and to determine the errors associated with the SCADS attitude. A more complete discussion of the analytical foundation of SCADS concept and its use for the geometries particular to this study, as well as salient design parameters for the passive and active systems are included.
Source record↗
Effect of radiometric errors on accuracy of temperature-profile measurement by spectral scanning using absorption-emission pyrometry
The spectral-scanning method may be used to determine the temperature profile of a jet- or rocket-engine exhaust stream by measurements of gas radiation and transmittance, at two or more wavelengths. A single, fixed line of sight is used, using immobile radiators outside of the gas stream, and there is no interference with the flow. At least two sets of measurements are made, each set consisting of the conventional three radiometric measurements of absorption-emission pyrometry, but each set is taken over a different spectral interval that gives different weight to the radiation from a different portion of the optical path. Thereby, discrimination is obtained with respect to location along the path. A given radiometric error causes an error in computed temperatures. The ratio between temperature error and radiometric error depends on profile shape, path length, temperature level, and strength of line absorption, and the absorption coefficient and its temperature dependency. These influence the choice of wavelengths, for any given gas. Conditions for minimum temperature error are derived. Numerical results are presented for a two-wavelength measurement on a family of profiles that may be expected in a practical case of hydrogen-oxygen combustion. Under favorable conditions, the fractional error in temperature approximates the fractional error in radiant-flux measurement.
Buchele, D. R.↗