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  • 1
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    Hubble Space Telescope COSTAR asphere verification with a modified computer-generated hologram interferometer (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: To correct for the spherical aberration in the Hubble Space Telescope primary mirror, five anamorphic aspheric mirrors representing correction for three scientific instruments have been fabricated as part of the development of the corrective-optics space telescope axial-replacement instrument (COSTAR). During the acceptance tests of these mirrors at the vendor, a quick and simple method for verifying the asphere surface figure was developed. The technique has been used on three of the aspheres relating to the three instrument prescriptions. Results indicate that the three aspheres are correct to the limited accuracy expected of this test.
    Keywords: OPTICS
    Type: Applied Optics (ISSN 0003-6935); 32; 10; p. 1786-1788.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Wide-angle flat field telescope (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Described is an unobscured three mirror wide angle telescopic imaging system comprised of an input baffle which provides a 20 deg (Y axis) x 30 deg (X axis) field of view, a primary mirror having a convex spherical surface, a secondary mirror having a concave ellipsoidal reflecting surface, a tertiary mirror having a concave spherical reflecting surface. The mirrors comprise mirror elements which are offset segments of parent mirrors whose axes and vertices commonly lie on the system's optical axis. An iris diaphragm forming an aperture stop is located between the secondary and tertiary mirror with its center also being coincident with the optical axis and being further located at the beam waist of input light beams reflected from the primary and secondary mirror surfaces. At the system focus following the tertiary mirror is located a flat detector which may be, for example, a TV imaging tube or a photographic film. When desirable, a spectral transmission filter is placed in front of the detector in close proximity thereto.
    Keywords: OPTICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Simplified systematic production of graphite/polymide prepreg (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Systematic method of producing preimpregnated polymide/graphite material is ideally suited for researchers and small lot producers of composite structures.
    Keywords: MATERIALS
    Type: LAR-12266 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Nondestructive spot tests allow rapid identification of metals (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ordered qualitative test sequence, presented in flow chart form, permits identification of all common metallurgical elements and many high-temperature, stainless, high and low carbon, and tool steels within about 30 minutes. Identification is made from colors or specific reactions produced by the addition of standard chemical reagents.
    Keywords: MATERIALS
    Type: LAR-10539
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Optical design of Lyman/FUSE (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The optical system for the proposed Lyman/Far UV Spectroscopic Explorer (FUSE) orbiting observatory is described and illustrated with drawings and graphs of predicted performance. The system comprises (1) an FUV channel based on a 1.84-m-diameter Rowland circle spectrograph with five high-density modified ellipsiodal near-normal-incidence gratings and an array of four MAMA detectors; (2) an EUV channel with ellipsoidal mirror, planar varied-line-space grating, microchannel-plate array, and wedge-and-strip anode detector; (3) a 70-cm Wolter II glancing-incidence telescope; and (4) a CCD-detector fine-error sensor to provide accurate pointing (within 200 marcsec rms). The resolving powers of the spectrographs are 30,000 in the FUV and 300-600 (wavelength-dependent) in the EUV.
    Keywords: OPTICS
    Type: Instrumentation in Astronomy VII; Feb 13, 1990 - Feb 17, 1990; Tucson, AZ; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Flexural Properties of Aramid-Reinforced Pultrusions (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Four resin systems show improved properties after postcuring. Comparison of flexural properties made of pultrusions reinforced by Kevlar (or equivalent) aromatic polyamide and having constant fiber volume and varied matrices, pretreatments, and postcures. Objective of study to improve flexural properties of pultrusion reinforced with Kevlar (or equivalent). Advantages of using pultrusion process, over conventional hand-layup methods included higher production rates, low facility and labor requirements, and reduced manufacturing costs of advanced composites.
    Keywords: MATERIALS
    Type: LAR-13442 , NASA Tech Briefs (ISSN 0145-319X); 11; 2; P. 46
    Format: text
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    NASA TECHNICAL REPORTS
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