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  • 1
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    Unknown
    Simple Schlieren Light Meter (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Simple light-meter circuit used to position knife edge of schlieren optical system to block exactly half light. Enables operator to check quickly position of knife edge between tunnel runs to ascertain whether or not in alignment. Permanent measuring system made part of each schlieren system. If placed in unused area of image plane, or in monitoring beam from mirror knife edge, provides real-time assessment of alignment of schlieren system.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-14249 , NASA Tech Briefs (ISSN 0145-319X); 16; 1; P. 23
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Reflection-Zone-Plate Antenna (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Microwave antenna, based on reflection holography, designed and tested. Modified to produce arbitrary beam patterns by controlling relief pattern. Antenna planar or contoured to supporting structure. Low off-axis radar cross section at frequencies removed from operational frequency. Interference pattern produced by spherical wave intersecting plane wave consists of concentric circles similar to Newton's rings. Pattern identical to Fresnel zone plate, which has lens properties. Plane wave incident on hologram, or zone plate, focused to point.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-13537 , NASA Tech Briefs (ISSN 0145-319X); 13; 2; P. 23
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Electronic Rotator For Sheet Of Laser Light (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Primary flow-visualization system in Basic Aerodynamic Research Tunnel (BART) at NASA Langley Research Center is sheet of laser light generated by 5-W argon-ion laser and two-axis mirror galvanometer scanner. Generates single and multiple sheets of light, which remain stationary or driven to sweep out volume. Sine/cosine potentiometer used to orient two galvanometer/mirror devices simultaneously and yields desired result at reasonable cost and incorporated into prototype in 1 day.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-13836 , NASA Tech Briefs (ISSN 0145-319X); 13; 11; P. 20
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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