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.
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Using Mossbauer effect and laser interferometry to determine extremely small amplitudes for vibration measurements and calibration of scale models
Interferometry system of NASA satellite tracking station at Santiago de Chile, describing system specifications, operation and antenna arrangement
Holographic interferometry with UV light from KDP crystal generating second harmonic of Q switched ruby laser red output, noting optical path length sensitivity
Double exposure holographic interferometry with separate reference beams, noting finite-fringe interferogram reconstruction and transient phenomena recording capabilities
Quantitative interpretation of three dimensional weakly refractive phase objects using holographic interferometry, determining index of refraction
Atmospheric refractive corrections in high accuracy radio interferometry
Light velocity from frequency and wavelength differences between gas laser lines, using precision long path interferometry
Application of separate reference beam holographic interferometry for measurement of small phase variations in sub-fringe systems
Mirror movement analysis by holographic interferometry for application to spaceborne telescopes
Very long baseline interferometry /VLBI/ of Jupiter decametric bursts at HF
Ionospheric and tropospheric effects on differential phase path in very long baseline interferometry, using ray tracing computer program
Holography and interferometry industrial applications, considering three dimensional imaging, precision distance measurement, nondestructive testing and structural strains and failures detection
Pulsed laser double exposure holographic interferometry for measuring transverse wave propagation in beams
Quasar internal kinematics and fine structure rapid time variations from radio interferometry
Holographic interferometry application to laser NDT of objects with nonoptical surfaces, describing techniques and industrial uses
Q-switched ruby laser holographic interferometry for hypergolic flame combustion recording
Some astronomical results, obtained by very long baseline interferometry, on quasi-stellar sources are reported. Data cover variations in optical luminosity, radio brightness variations, and observations of quasi-stellar nuclei.
Scatter plate interferometry has become a reliable method of measuring surface configurations of telescope mirrors and other optical components. The scatter plate used in an instrument should be of optimum quality if the surface it is being used to measure is to be of high accuracy. Tests were performed and results show that, although many scatter plates would function, few were of the optimum quality necessary. These few were of the 180 grit group, using 35- and 30-s exposures, which are figures derived from calculations.