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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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Optical superheterodyne receiver uses a laser coupled to a frequency translator to supply both the incident signal and local oscillator signal and thus permit reception of amplitude modulated video bandwidth signals through the atmosphere. This receiver is useful in scientific propagation experiments, tracking experiments, and communication experiments.
Precision laser tracker capable of tracking a low acceleration target to an accuracy of about 20 microradians rms is being constructed and tested. This laser tracking has the advantage of discriminating against other optical sources and the capability of simultaneously measuring range.
Flight tests of solid propellant rockets in dynamic spin or roll environments
Design and performance characteristics of variable dynamic force vector rocket test apparatus
Sensitivity and tracking capabilities of precision laser automatic tracking system
Optical superheterodyne receiver
Ballistic propellant combustion alteration and thermal effects due to dynamic spinning observed on solid propellant sounding rockets
Optical communication experiments to compare coherent and noncoherent optical detection fading characteristics in different weather conditions, using laser transmitter and optical superheterodyne receiver
Continuous wave laser ground-space-ground experiment in conjunction with Explorer XXII SATELLITE tracking
Ballistic propellant combustion alteration and thermal effects due to dynamic spinning observed on solid propellant sounding rockets
Acceleration effects on solid propellant rocket motors combustion characteristics
Diagnostic optical communication experiments comparing noncoherent and coherent detection techniques, discussing atmospheric turbulence effects on signal fading
Optical communications experiments for quantitative data at 6328 A on system fading due to scintillation and atmospheric turbulence effects on coherent propagation at 10.6 micron
Acceleration effects on solid propellant rocket motors combustion characteristics
Mechanism explaining mass loss for luminous hot stars using ultraviolet line spectra of some ions
Laser transmitter and optical superheterodyne receiver performance tests at 6328 A, demonstrating aperture size effect and noncoherent operation superiority
Luminous hot stars mass loss attributed to negative effective gravities in outer parts of reversing layers from ionic UV resonance lines
Typical laser systems now available for atmospheric probing are summarized. Experiments comparing coherent and incoherent receiving techniques are described and typical performance data presented.