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  • INSTRUMENTATION AND PHOTOGRAPHY  (22)
  • 2020-2023
  • 2010-2014
  • 1990-1994  (10)
  • 1965-1969  (12)
  • 1
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    Determination of high temperature strains using a PC based vision system (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: With the widespread availability of video digitizers and cheap personal computers, the use of computer vision as an experimental tool is becoming common place. These systems are being used to make a wide variety of measurements that range from simple surface characterization to velocity profiles. The Sub-Pixel Digital Image Correlation technique has been developed to measure full field displacement and gradients of the surface of an object subjected to a driving force. The technique has shown its utility by measuring the deformation and movement of objects that range from simple translation to fluid velocity profiles to crack tip deformation of solid rocket fuel. This technique has recently been improved and used to measure the surface displacement field of an object at high temperature. The development of a PC based Sub-Pixel Digital Image Correlation system has yielded an accurate and easy to use system for measuring surface displacements and gradients. Experiments have been performed to show the system is viable for measuring thermal strain.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, The 1992 NASA Langley Measurement Technology Conference: Measurement Technology for Aerospace Applications in High-Temperature Environments; p 237-243
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  • 2
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    Ambient temperature recorder (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A temperature data recorder, designated the Ambient Temperature Recorder (ATR-4), was developed at NASA Ames Research Center to meet particular requirements for space life sciences experiments. The small, self-contained, four-channel, battery-powered device records 32 kilobytes of temperature data over a range of -40 to +60 C at four sampling intervals ranging from 1.875 to 15 minutes. Data is stored in its internal electronic memory for later readout by a personal computer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Washington, Technology 2001: The Second National Technology Transfer Conference and Exposition, Volume 2; p 407-414
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  • 3
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    Density disturbance ahead of a sphere in rarefied supersonic flow. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Density distribution along stagnation streamline of sphere in rarefied supersonic flow, noting upstream disturbance
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; ACE(
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  • 4
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    Modeling and measurement of the performance of a branched conduit sampling system in a mass spectrometer leak detector (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In the leak testing of a large engineering system, one may distinguish three stages, namely leakage measurement by an overall enclosure, leak location, and leakage measurement by a local enclosure. Sniffer probes attached to helium mass spectrometer leak detectors are normally designed for leak location, a qualitative inspection technique intended to pinpoint where a leak is but not to quantify its rate of discharge. The main conclusion of the present effort is that local leakage measurement by a leak detector with a sniffer probe is feasible provided one has: (1) quantitative data on the performance of the mass separator cell (a device interior to the unit where the stream of fluid in the sample line branches); and (2) a means of stabilizing the mass transfer boundary layer that is created near a local leak site when a sniffer probe is placed in its immediate vicinity. Theoretical models of the mass separator cell are provided and measurements of the machine-specific parameters in the formulas are presented. A theoretical model of a porous probe end for stabilizing the mass transfer boundary is also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Univ. of Central Florida, NASA(ASEE Summer Faculty Fellowship Program. 1994 Research Reports; p 419-448
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  • 5
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    An event recorder for obtaining missile heat- shield ablation data. (1967)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Event recorder for in-flight measurements of missile heat-shield ablation
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 6
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    Polarization analysis of a balloon-borne solar magnetograph (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The 10(exp -5) polarization specification for the Balloon-borne Vector Magnetograph (BVM) can be met. The 10(exp -5) specification is shown to be a limitation on the diattenuation and retardance along the chief ray path through the optical system, such that the magnitude of the polarization aberration piston term is constrained to be less than .5(10)(exp -5). Coating specification sheets are provided which will ensure that the polarization sensitivity of the BVM will be less than 10(exp -5). An optical design is provided for a vector magnetograph. Finally, to provide a concrete mathematical meaning for polarization sensitivity, the polarization aberration matrix is averaged of the exit pupil. This shows that the coupling between circular and linear states depends only on the magnitude of the polarization aberration piston term.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-193908 , NAS 1.26:193908
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  • 7
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    Advances in sapphire optical fiber sensors (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: We describe the development and testing of two sapphire fiber sensor designs intended for use in high temperature environments. The first is a birefringence-balanced polarimetric sapphire fiber sensor. In this sensor, two single crystal sapphire rods, acting as the birefringence sensing element, are connected to each other in such a way that the slow axis of the first rod is aligned along with the fast axis of the second rod, and the fast axis of the first rod is along the slow axis of the second rod. This sensor has been demonstrated for measurement of temperature up to 1500 C. The second is a sapphire-fiber-based intrinsic interferometric sensor. In this sensor, a length of uncoated, unclad, structural-graded multimode sapphire fiber is fusion spliced to a singlemode silica fiber to form a Fabry-Perot cavity. The reflections from the silica-to-sapphire fiber splice and the free endface of the sapphire fiber give rise to the interfering fringe output. This sensor has been demonstrated for the measurement of temperature above 1510 C, and a resolution of 0.1 C has been obtained.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Fiber optic smart structures and skins V; Proceedings of the Meeting, Boston, MA, Sept. 8, 9, 1992 (A93-37326 14-35); p. 56-65.
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  • 8
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    Development of ablation sensors for advanced reentry vehicles. (1965)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Make wire, light pipe and spring wire ablation sensors development for measuring parameters of heat shield materials for reentry vehicles
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 9
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    Holographic data storage crystals for the LDEF (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Crystals of lithium niobate were passively exposed to the space environment of the Long Duration Exposure Facility (LDEF). Three of the four crystals contained volume holograms. Although the crystals suffered the surface damage characteristic of that suffered by other components on the Georgia Tech tray, the crystals remained suitable for the formation of volume holograms.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. Part 4: Second Post-Retrieval Symposium; p 1403-1411
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  • 10
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    Development of sensors to obtain in-flight ablation measurements of thermal-protection materials (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Design and development of sensors for measuring ablative changes in space vehicle heat shield during reentry phase
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-3686
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