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RECENT SHUTTLE FLIGHTS HAVE SHOWN THAT SIGNIFICANT TEMPORARYOR PERMANENT DEGRADATION OF OPTICAL SURFACES CAN OCCUR IN FLIGHT. SEVERAL OSMIUM-COATED SAMPLES, FLOWN ON SHUTTLE FLIGHT STS 5, EXPERIENCED A PERMANENT LOSS OF REFLECTIVITY BY FACTORS OF 2-3 IN THE VACUUM ULTRAVIOLET PORTION OF THE SPECTRUM. OTHER COATING MATERIALS AND WINDOWS CARRIED ABOARD EARLIER SHUTTLE FLIGHTS SUFFERED LESS OR EVEN N ...

THIS STUDY WILL DETERMINE CLOUD PROPERTIES FROM LANDSAT 4 THEMATIC MAPPER (TM) DATA BY COMBINING A SPATIAL COHERENCE APPROACH WITH A VARIETY OF CLOUD PARAMETER RETRIEVAL METHODS. THE TM HAS SEVEN SPECTRAL BANDS WHICH, IN PRINCIPLE, ALLOW CLOUD AMOUNT, HEIGHT, PHASE, AND THICKNESS TO BE RETRIEVED. CLOUD PARTICLE SIZE MAY ALSO BE RETRIEVABLE. THE SPATIAL COHERENCE APPROACH WILL ACCOUNT FOR PARTIAL B ...

THIS PROJECT EVALUATES THE USE OF RAYLEIGH SCATTERING TECHNIQUES FOR USE AS A TEMPERATURE MONITOR IN THE SEVERE ENVIRONMENT OF GAS TURBINES. POTENTIAL ADVANTAGES OF THIS TECHNIQUE OVER ALL OTHER PRESENTLY USED METHODS ARE HIGH ACCURACY (+/-10K), EASE OF INSTALLATION, HIGH SPATIAL AND TEMPORAL RESOLUTION, AND NONINTRUSIVE OPERATION. THIS PHASEOF THE PROGRAM CONSISTS OF DETAILED FEASIBILITY CALCULAT ...

IT IS DESIRABLE TO ENHANCE THE ABILITY TO MAKE HIGH PURITY SILICON CARBIDE CRYSTALS TO BE USED IN MONITORING INSTRUMENTS AND SENSORS FOR USE IN HARSH ENVIRONMENTS. A SIGNIFICANT ADVANCEMENT IN SIC PRODUCTION HAS BEEN MADE AT NASA-LEWIS. THE OBJECTIVE OF THIS PROJECT IS TO OPTIMIZE THE NASA-LEWIS PROCESS FOR MAKING SEMICONDUCTOR-QUALITY SILICON CARBIDE CRYSTALS BY BETTER UNDERSTANDING BOTH THE CHEM ...

THIS IS A PROJECT TO ESTABLISH THE FEASIBILITY OF A TECHNIQUE FOR FORMING HOLOGRAMS FOR THREE DIMENSIONAL IMAGES OF COMPUTER-GENERATED OBJECTS IN REAL-TIME POINT BY POINT. THIS PROPRIETARY TECHNIQUE IS A METHOD FOR QUICKLY MOVING POINTS OF LIGHT THROUGH A THREE-DIMENSIONAL OBJECT VOLUME. THIS NEW METHOD, ALONG WITH THE YOUNG TECHNOLOGY OF REAL-TIME THERMO-PLASTIC RECORDING MATERIALS, WILL OVERCOME ...

THE PURPOSE OF THIS PROJECT IS TO DESIGN AND DEVELOP AN INSTRUMENT TO MEASURE FLUXES OF TRACE GASES IN ORDER TO DETERMINE THEIR SOURCES AND SINKS IN THE BIOSPHERE. THE METHOD IS BASED ON THE WELL ESTABLISHED EDDY CORRELATION TECHNIQUE AND WOULD USE A TUNABLE DIODE LASER SOURCE COMBINED WITH A UNIQUE OPEN PATH MULTIPLE PASS ABSORPTION CELL FOR TRACE SPECIES DETECTION AT SUB-PPB LEVELS. THIS INSTRUM ...

CONVENTIONAL FILM PROCESSING TECHNIQUES ARE NOT DESIGNED FOR USE IN LOW-GRAVITY ENVIRONMENTS, BECAUSE OF THE DIFFICULTIES ASSOCIATED WITH CONFINING FREE LIQUIDS WHILE PERMITTING THE INTRODUCTION AND TRANSPORT OF ROLL FILMS INTO AND THROUGH THESE LIQUIDS. IN THIS TECHNIQUE, VISCOUS PROCESSING SOLUTIONS ARE EXTRUDED IN THIN LAYERS ONTO THE FILMS EMULSION SURFACE AND RAPIDLY PROCESS THE FILM. ARCHIVA ...

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FOR MANY YEARS MERCURIC IODIDE HAS APPEARED TO BE AN IDEAL MATERIAL FOR USE AS AN UNCOOLED X-RAY AND GAMMA-RAY DETECTOR. IT HAS DEMONSTRATED EXCEPTIONAL ENERGY RESOLUTIONFOR LOW ENERGY X-RAYS AND HAS BEEN CONSIDERED FOR SEVERAL NASA SPACE MISSIONS. HOWEVER, MERCURIC IODIDE DETECTORS HAVE BEEN PLAGUED BY SEVERE INSTABILITY PROBLEMS RELATED TO THE CHEMICAL AND PHYSICAL PROPERTIES OF THE MERCURIC IOD ...