SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Contaminated optical surface investigation technique in near UV, visible and near IR range, investigating property changes of systems in transmission and reflection
Visible and IR imagery by meteorological satellites measuring surface temperature, atmospheric circulation and state parameters, storm development and tracking, cloud motions, etc
Lunar rocks mineralogy and visible and near IR reflectivity, discussing depression in telescopic curve
Low visibility approach and landing simulation for jet transports
Fixed base simulation evaluation of one fully automatic and six manual low visibility landing systems for helicopters
Computer techniques for trafficability and visibility analysis of lunar surface in mission planning for roving vehicles
Comparison of Injun 5 satellite measurements of low energy electron precipitation and ground based observations of visible auroral arc
Helicopter automatic and manual low visibility landing systems evaluation by hybrid computer simulation
Aerosol power law distribution exponent and particle limiting radii from turbid atmosphere outgoing visible radiation polarization high altitude measurements
Jupiter circularly polarized visible light measurements, using photoelastic polarimeter
Visible thermal tuning CW parametric oscillator using barium sodium niobate as nonlinear material
Visible and near UV spectra of vacuum Ar, Kr and Xe microwave discharge lamps with magnesium fluoride windows
The spectral emission characteristics of three commercial low pressure rare gas discharge lamps wire obtained in the near ultraviolet and visible wavelength range. All three lamps show a definite continuum over the entire wavelength range from 0.185 to 0.6 micrometers. Considerable line emission is superimposed on much of the continuum for wavelengths greater than 0.35 micrometers. These sources were used to make transmittance measurements on quartz samples in the near ultraviolet wavelength range.
A technique for measuring speed of response of high speed visible and IR optical detectors to mode-locked Nd:YAG laser pulses is described. Results of measurements of response times of four detectors are presented. Three detectors that can be used as receivers in a 500-MHz optical communication system are tested.
Measurements of the specific emission coefficient in the near ultra-violet and visible region of a uranium arc plasma are reported. Spatial unfolding of the intensity profile is used to determine the emission coefficient in the spectral range of 2000 A to 6000 A. The uranium partial pressure is estimated to range between .001 and .01 atmosphere, and the corresponding temperature range is 5000 - 10,000 K.
We demonstrate in this article that there is spectroscopic evidence for the structure of the visible Venus cloud layers. From physically realistic models of the lower Venus atmosphere, we have shown that only observations of the phase variations of the CO2 bands in the Venus spectrum can provide the information for a unique identification of the structure of the cloud layers. It is proved that Venus cannot have a single dense cloud layer, but must have two scattering layers; a thin aerosol layer situated in the lower stratosphere, overlying a dense cloud deck. The aerosol plays an important role in the scattering of radiation, so that its identification provides an explanation of the reflecting layer-scattering model controversy for the interpretation of spectra formed in a cloudy planetary atmosphere.
ERTS-1 digital enhancement of multispectral MSS data for maximum image visibility
A systematic approach to the enhancement of images has been developed. This approach exploits two principal features involved in the observation of images: the properties of human vision and the statistics of the images being observed. The rationale of the enhancement procedure is as follows: in the observation of some features of interest in an image, the range of objective luminance-chrominance values being displayed is generally limited and does not use the whole perceptual range of vision of the observer. The purpose of the enhancement technique is to expand and distort in a systematic way the grey scale values of each of the multispectral bands making up a color composite, to enhance the average visibility of the features being observed.