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  • 1
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    A technique for the determination of the dipole moment of a spacecraft from a limited amount of near field data (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: Field measurements by rotating spacecraft for dipole moment determination
    Keywords: SPACE VEHICLES
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 324-326
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Designing generalized conic concentrators for conventional optical systems (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Generalized nonimaging concentrators can be incorporated into conventional optical systems in situations where flux concentration rather than imaging is required. The parameters of the concentrator for maximum flux concentration depend on the design of the particular optical system under consideration. Rationale for determining the concentrator parameters is given for one particular optical system and the procedure used for calculation of these parameters is outlined. The calculations are done for three concentrators applicable to the optical system.
    Keywords: OPTICS
    Type: Applied Optics (ISSN 0003-6935); 24; 1204
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Sky input horn for a far-infrared interferometer (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A unique design has been developed whereby a compound parabolic concentrator (CPC) and a compound elliptical concentrator (CEC) are joined at their throats. The CPC serves as the field-defining optics, in that it accepts up to a certain maximum acceptance angle and then concentrates this accepted energy at its throat. Energy incident from angles greater than the acceptance angle is rejected. The CEC takes the energy concentrated at the CPC throat and then redirects this energy into a finite-sized pupil a given distance away. The considered design will be used as the sky input horn for a cryogenic far-infrared polarizing interferometer to be flown on NASA's Cosmic Background Explorer satellite. The interferometer will operate at 2 K and measure the 3-K cosmic background radiation of the universe in the 100-micrometer-1-cm spectral range.
    Keywords: ASTRONOMY
    Type: Optics Letters; 7; May 1982
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Optical alignment measurements at Goddard Space Flight Center (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The significant changes that have been made in the Optical Alignment Facility at the Goddard Space Flight Center since it was last described (Appler and Howell, 1968) are discussed. The changes are reflected in both the hardware and the software involved in making alignment measurements. The data analysis procedures can now be done on a desktop computer with turn-around times of approximately 4 h. Arbitrary coordinate transformations and corrections for facility errors are also feasible while retaining absolute accuracies of less than 6 sec of arc.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Applied Optics; 21; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Generalized conic concentrators (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Explicit forms for the six coefficients of a generalized quadric surface are given in terms of the parameters of a tilted and displaced elliptical or hyperbolic surface. The parent conic parameters, together with the values for its tilt and displacement, are then related to the physical conic concentrators. The parent conic parameters are related to the concentrator's large and small aperture sizes and the angle of the limiting ray.
    Keywords: OPTICS
    Type: Applied Optics; 21; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Submillimeter and millimeter wave characterization of absorbing materials (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Several microwave absorbers have been characterized in terms of transmittance and reflectance at frequencies between 35 GHz and 3 THz. The materials studied were a series of iron-loaded cast epoxy absorbers known as Eccosorb. Measurements show that reflectance and absorption coefficient increase with the iron density. A dramatic decrease, by as much as a factor of 2, in absorption coefficient was observed when the samples were cooled from ambient to cryogenic temperatures. A blackbody calibrator to be operated at liquid helium temperature was constructed using the measured optical constants for these absorbers. The measured absorption coefficient for cold Eccosorb CR-110 is within 20 percent of that reported recently by Peterson and Richards.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 24; 4489-449
    Format: text
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  • 7
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    Magnetic dipole moment determination by near-field analysis (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for determining the magnetic moment of a spacecraft from magnetic field data taken in a limited region of space close to the spacecraft. The spacecraft's magnetic field equations are derived from first principles. With measurements of this field restricted to certain points in space, the near-field equations for the spacecraft are derived. These equations are solved for the dipole moment by a least squares procedure. A method by which one can estimate the magnitude of the error in the calculations is also presented. This technique was thoroughly tested on a computer. The test program is described and evaluated, and partial results are presented.
    Keywords: PHYSICS, GENERAL
    Type: NASA-TN-D-6685 , G-1034
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    IMP I spacecraft initial magnetic test (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Initial magnetic test of IMP-I spacecraft with reduction of magnetic moment by dc rotation deperm treatments
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-65526 , X-325-70-472
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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