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  • Other Sources  (11)
  • 1975-1979  (11)
  • 1960-1964
Collection
Source
Keywords
Years
Year
  • 1
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    Unknown
    Field-widened pinhole camera (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Wood demonstrated a method in 1906 that allowed 180-deg FOV but required that the film be immersed in a tank of water. This paper presents a technique that yields the same 180-deg FOV without the necessity of wetting the film. Rays from a 180-deg FOV cone are reduced to 84-deg cone due to refraction at the glass surface. If the cone were then incident on another glass/air plane surface, it would be expanded back to 180 deg.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 18; Sept. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Laser Doppler velocity simulator (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method and apparatus for inducing a Doppler frequency shift in a reference beam laser velocimeter light beam to simulate target velocity are described. The light beam is passed through a rotating refractive transparent block positioned between two reference points along the beam which results in a continuous change in the light beam optical path length between the reference points according to a known function. The velocity indicated by the laser velocimeter is compared to the known simulated velocity function for velocimeter testing and calibration.
    Keywords: LASERS AND MASERS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Wide angle pinhole camera (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Hemispherical refracting element gives pinhole camera 180 degree field-of-view without compromising its simplicity and depth-of-field. Refracting element, located just behind pinhole, bends light coming in from sides so that it falls within image area of film. In contrast to earlier pinhole cameras that used water or other transparent fluids to widen field, this model is not subject to leakage and is easily loaded and unloaded with film. Moreover, by selecting glass with different indices of refraction, field at film plane can be widened or reduced.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11905 , NASA Tech Briefs (ISSN 0145-319X); 3; 2; P. 192
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Directional laser velocimeter with doppler velocity simulator (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Technique uses phase-shift networks at optical and baseband frequencies and, as such, is optical adaptation of previously-existing microwave technology. Application is planned for wind-tunnel velocity measurements. Alternative configuration produces finite fringes that move in one direction or other as measured particle approaches or recedes.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-12176 , LAR-12177 , NASA Tech Briefs (ISSN 0145-319X); 3; 1; P. 36
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Noise reduction in photomultiplier circuits (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Simple damping device inserted in cable at power supply acts as filter, thus eliminating noise pulses in photomultiplier tube.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-12091 , NASA Tech Briefs (ISSN 0145-319X); 2; 2; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Laser beam color separator (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Multiwavelength laser beam is separated into series of parallel color beams using prism and retroreflector. Setup is inexpensive and needs no critical adjustments. It can incorporate several prisms to increase dispersion and reduce overall size. Transmission grating can be used instead of prism with sacrifice in efficiency. Spatial filter can remove unwanted beams.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11806 , NASA Tech Briefs (ISSN 0145-319X); 3; 2; P. 193
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Miniature velocimeter (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Laser velocimeter (LV) designed to use semiconductor-diode laser is 100 times smaller than continuous-wave gas-laser velocimeter permitting mounting within wind-tunnel models or on engine walls. Mini LV uses only 0.4 watts of power and measures velocities with accuracy of 98% or better.
    Keywords: MECHANICS
    Type: LAR-12281 , NASA Tech Briefs (ISSN 0145-319X); 3; 4; P. 572
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Visual alignment aid (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Device consists of beam-splitter cube and two 90 deg prisms cemented together. Various components can be made as two pieces, eliminating seams, except beam-splitter diagonal.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11842
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Dual-band ridged waveguide (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Waveguide-in-waveguide technique involves routing two waveguides through same passageway. Smaller waveguide can be soft or silver soldered inside X-band waveguide to form single ridge guide and to propagate frequencies at C-band.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-11781
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Holographic direct-vision spectroscope (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Spectroscope incorporates two prisms combined with holographic grating as dispersing element. This provides high dispersion with selective undeviated wavelength. Prisms with different indices of refraction and/or angles for construction and reconstruction may be used. Also, different prisms for input and output may be used.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11750
    Format: application/pdf
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