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  • 1
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    Isothermal dendritic growth: A low gravity experiment (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Isothermal Dendritic Growth Experiment is an active crystal growth experiment designed to test dendritic growth theory at low undercoolings where convection prohibits such studies at 1 g. The experiment will be essentially autonomous, though limited in-flight interaction through a computer interface is planned. One of the key components of the apparatus will be a crystal growth chamber capable of achieving oriented single crystal dendritic growth. Recent work indicates that seeding the chamber with a crystal of the proper orientation will not, in and of itself, be sufficient to meet this requirement. Additional flight hardware and software required for the STS flight experiment are currently being developed at NASA Lewis Research Center and at Rensselaer Polytechnic Institute.
    Keywords: MATERIALS PROCESSING
    Type: NASA, Washington, Microgravity Science and Applications Flight Programs, January - March 1987, Selected Papers, Volume 1; p 411-425
    Format: application/pdf
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  • 2
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    Determination of the Critical Parameters for Remote Microscope Control (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: As part of a program to determine the capabilities of Telescience as applied to Microgravity Materials Science the need for a remotely controlled microscope was recognized. For this purpose we equipped a microscope with an X-Y-Z positioning device and motors on the zoom and focus controls. Computer control of these devices allowed remote operation. A standard TV camera was mounted to the computer controlled video board which could compress the image in resolution and grey scale. The operator control console was programmed to display three still video pictures as well as provide command access. A standard data transfer network was used to transmit the video data files and the command interaction was via a high speed phone modem. This system, with the microscope in the Microgravity Materials Science Laboratory (MMSL) at LeRC and the control at RPI, was used to determine the accuracy of setting, time required to achieve setting and the operator ease factor. It was found that the focus setting could be established well within the resolution limit of the TV system and that each motion took about 50 seconds and approximately 12 minutes was required to reach ?best? focus. These times could be reduced significantly with operator experience. The operators were provided with ancillary equipment which provided assistance in making the necessary decisions and they reported satisfaction with the control.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: IAF PAPER 91-026
    Format: text
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  • 3
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    OSS-1/STS-3 Shuttle induced atmosphere experiment (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Direct light form the Sun and the sunlit Earth, and indirect light from these same sources reflected off parts of the orbiter and its payload were the two major sources of light seen in the bay during spacecraft day. Brightness arising from sunlight reflected off particulates originating from the spacecraft (corona or induced atmosphere) were tentatively identified. Sources of light observed during spacecraft night include large scale diffuse glows associated with Vernier thruster firings, surface glows on the orbiter in the direction of orbiter n motion, and periodic sky brightness structures observed primarily at 4200 A and 6300 A. Some information was obtained on the size and trajectories of individual contaminant particulates. Astronomical data were obtained from large regions of the Milky Way and zodiacal light, including large regions to within 35 deg of the Sun and possibly closer. Coordinated and sometimes simultaneous observations were successfully made from Hawaii and from STS-3 to provide unique information on atmospheric sources and sinks of radiation.
    Keywords: SPACE TRANSPORTATION
    Type: Systematics General Corp. The Shuttle Environ. Workshop; 15 p
    Format: application/pdf
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  • 4
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    The isothermal dendritic growth experiment - A USMP-2 space flight experiment (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The NASA Isothermal Dendritic Growth Experiment (IDGE), which is to be performed on three of the U.S. Microgravity Payload flights, is discussed. IDGE is designed to investigate dendritic growth under microgravity. The theory of dendritic growth and the effects of gravity on it are reviewed, and the IDGE experimental apparatus, design, and ground-based tests are discussed.
    Keywords: MATERIALS PROCESSING
    Type: AIAA PAPER 92-0350
    Format: text
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  • 5
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    Dendritic solidification under microgravity conditions (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Isothermal Dendritic Growth Experiment is undergoing development in cooperation with NASA-Lewis in order to test dendritic growth theory at small supercoolings in low earth orbit. The apparatus encompasses four major subsystems: a temperature-controlled thermostatic bath capable of millikelvin stability, a photographic data collection system, a crystal-growth chamber, and a start-detection system which initiates data collection. Comparisons are made with ground-based study methods for dendritic growth.
    Keywords: MATERIALS PROCESSING
    Type: AIAA PAPER 88-0248
    Format: text
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  • 6
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    The Skylab ten color photoelectric polarimeter (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A 10-color photoelectric polarimeter was used during Skylab missions SL-2 and SL-3 to measure sky brightness and polarization associated with zodiacal light, background starlight, and the spacecraft corona. A description is given of the instrument and observing routines together with initial results on the spacecraft corona and polarization of the zodiacal light.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space Science Instrumentation; 1; Nov. 197
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  • 7
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    Photoheliograph thermal vacuum optical test chamber, November 1967 - June 1968 (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Thermal vacuum optical test chamber design for ATM photoheliograph
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: NASA-CR-110248 , JPL-750-9
    Format: application/pdf
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  • 8
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    Polarization of the zodiacal light - First results from Skylab (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A brief description is given of the Skylab ten color photoelectric photometer and the programs of measurements made during Skylab missions SL-2 and SL-3. Results obtained on the polarized brightness of zodiacal light at five points on the antisolar hemisphere are discussed and compared with other published data for the north celestial pole, south ecliptic pole, at elongation 90 degrees on the ecliptic, and at two places near the north galactic pole.
    Keywords: GEOPHYSICS
    Type: Interplanetary dust and zodiacal light; Jun 10, 1975 - Jun 13, 1975; Heidelberg
    Format: text
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  • 9
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    Ten-color Gegenschein-zodiacal light photometer (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A ten-color Fabry photometer was used during Skylab missions SL-2 and SL-3 to measure sky brightness and polarization associated with zodiacal light, background starlight, F region airglow, and spacecraft corona. A brief description is given of the design, calibration, and performance of the instrument.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 16; Apr. 197
    Format: text
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  • 10
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    A facility for precise temperature control applications in microgravity (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The general design, main components, and operation of the isothermal dendritic growth apparatus (IDGA) designed for microgravity experimentation are described. The four major subsystems of the IDGA are a temperature controlled thermostatic bath capable of milli-kelvin stability, a photographic data collection system, a crystal growth chamber, and a growth detection system to initiate data collection. Some of the specific experiments that could utilize the capabilities of the IDGA are dendritic growth in alloys, monotectic systems, life science experiments, and technological applications.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Advances in Space Research (ISSN 0273-1177); 8; 12 1
    Format: text
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