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  • 1
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    High-sensitivity receiver for infrared laser communications. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of a high-sensitivity wide-bandwidth 10.6-micron heterodyne receiver for space and ground operational use. The receiver includes a cooled HgCdTe infrared mixer diode, a conical scanner for spatial tracking, an acquisition channel for spatial search and station alignment, and an automatic frequency-control channel to maintain a fixed laser frequency offset. The infrared mixer is designed to provide nearly quantum-noise-limited operation over an extended range of mixer temperature, bias voltage, and intermediate frequency. The resultant experimental receiver has a measured noise equivalent power of less than 10 to the minus 19th W/Hz over the 15- to 40-MHz i.f. band for mixer temperatures from 85 to 115 K, and less than 2 x 10 to the minus 19th W/Hz up to 140 K. Mixer 3-dB cutoff frequencies as high as 420 MHz were measured at a mixer temperature of 125 K. An analysis and engineering equations are given for receiver noise components, noise equivalent power, available mixer conversion gain, mixer transducer gain, and quantum-noise factor in terms of such factors as mixer parameters, quantum efficiency, mixer temperature, dynamic conductance, bias voltage, local oscillator power, and i.f. amplifier characteristics.
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Study of the application of hydrogen fuel to long-range subsonic transport aircraft, volume 2 (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The feasibility, practicability, and potential advantages/disadvantages of using liquid hydrogen as fuel in long range, subsonic transport aircraft of advanced design were studied. Both passenger and cargo-type aircraft were investigated. To provide a valid basis for comparison, conventional hydrocarbon (Jet A) fueled aircraft were designed to perform identical missions using the same advanced technology and meeting the same operational constraints. The liquid hydrogen and Jet A fueled aircraft were compared on the basis of weight, size, energy utilization, cost, noise, emissions, safety, and operational characteristics. A program of technology development was formulated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-132559 , LR-26752-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Study of the application of hydrogen fuel to long-range subsonic transport aircraft. Volume 1: Summary (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of using liquid hydrogen as fuel in advanced designs of long range, subsonic transport aircraft is assessed. Both passenger and cargo type aircraft are investigated. Comparisons of physical, performance, and economic parameters of the LH2 fueled designs with conventionally fueled aircraft are presented. Design studies are conducted to determine appropriate characteristics for the hydrogen related systems required on board the aircraft. These studies included consideration of material, structural, and thermodynamic requirements of the cryogenic fuel tanks and fuel systems with the structural support and thermal protection systems.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-132558 , LR-26752-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Coherent infrared receivers for laser communications and radar. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Review of infrared coherent detection processes. Three receivers are described which were built with the primary goal of exploiting quantum noise limited heterodyne detection in a spectral region where atmospheric transmission characteristics are favorable. The combination of high power, high efficiency carbon dioxide lasers, coherent heterodyne receivers with sensitivities approaching the quantum noise limit, and low-loss atmospheric transmission have presented new possibilities in infrared communications and radar. In particular, high sensitivity 10.6 micrometer heterodyne receivers with wide IF bandwidths have been developed.
    Keywords: COMMUNICATIONS
    Type: Electro-Optical Systems Design Conference; Sep 14, 1971 - Sep 16, 1971; New York, NY
    Format: text
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    NASA TECHNICAL REPORTS
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