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  • 1
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    Unknown
    In:  Other Sources
    Publication Date: 2011-08-16
    Description: A CO2 laser Doppler detection system has been developed to measure remotely the true airspeed of an aircraft. The system uses a 50-W sealed-off CO2 laser in a homodyne detection system employing a collinear optical telescope, a HgCdTe detector, and a frequency tracking loop. The system was successfully flight-tested on a NASA Convair 990 research aircraft during December 1971 and June 1972. The results indicate that an airspeed measurement under clear weather conditions is feasible up to an altitude of 3000 m with an error of less than 0.5%.-
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Dec. 197
    Format: text
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  • 2
    Publication Date: 2011-08-17
    Description: During the 1977 ITCZ (Intertropical Convergence Zone) experiment in Panama two aircraft and numerous balloon-borne radiosonde instruments were equipped to measure pressure and temperature. The experiment was a coordinated effort to evaluate the meteorological conditions that prevailed from July 17 through 31, 1977. A critical analysis of the data collected on one of the aircraft (the Lear jet) operating at altitudes to 13,000 m for about 2 hr each day during most days of the experiment is presented. The discussion includes a comparison of the vertical profiles of potential temperature obtained from the Learjet with those obtained from balloons launched at Ft. Sherman. Time histories of pressure, temperature, and potential temperature, as observed from the Learjet are also presented.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: The 1977 Intertrop. Convergence Zone Expt.; p 153-164
    Format: text
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  • 3
    Publication Date: 2018-12-01
    Description: Magnetometer for magnitude and direction of magnetic field /solar wind/ in space designed for Pioneer C and D spacecraft
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 4
    Publication Date: 2019-05-23
    Description: Nonlinear analog-to-digital converter measures the analog input level and continuously adjusts the digital readout scale sensitivity to effectively increase the accuracy. It is able to acquire more accurate low-level data.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: ARC-46
    Format: application/pdf
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  • 5
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    In:  CASI
    Publication Date: 2019-05-21
    Description: High efficiency multivibrator transistor circuit
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-RP-141
    Format: text
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  • 6
    Publication Date: 2019-06-27
    Description: Sensitivities of any arbitrary system are calculated using general purpose digital computer with available software packages for transfer function analysis. Sensitivity shows how element variation within system affects system performance. Signal flow graph illustrates topological system behavior and relationship among parameters in system.
    Keywords: ELECTRONIC SYSTEMS
    Type: ARC-10214
    Format: application/pdf
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  • 7
    Publication Date: 2019-06-27
    Description: Two data systems were developed for use in airborne research. Both have distributed intelligence and are programmed for interactive support among computers and with human operators. The C-141 system (ADAMS) performs flight planning and telescope control functions in addition to its primary role of data acquisition; the CV-990 system (ADDAS) performs data management functions in support of many research experiments operating concurrently. Each system is arranged for maximum reliability in the first priority function, precision data acquisition.
    Keywords: COMPUTERS
    Type: NASA-TM-X-62367
    Format: application/pdf
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  • 8
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    In:  CASI
    Publication Date: 2019-06-27
    Description: An input analog signal to be frequency analyzed is separated into N number of simultaneous analog signal components each identical to the original but delayed relative to the original by a successively larger time delay. The separated and delayed analog components are combined together in a suitable number of adders and attenuators in accordance with at least one component product of the continuous Fourier transform and analog signal matrices to separate the analog input signal into at least one of its continuous analog frequency components of bandwidth 1/N times the bandwidth of the original input signal. The original analog input signal can be reconstituted by combining the separate analog frequency components in accordance with the component products of the continuous Fourier transform and analog frequency component matrices. The continuous Fourier transformation is useful for spectrum analysis, filtering, transfer function synthesis, and communications.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Format: application/pdf
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  • 9
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    In:  CASI
    Publication Date: 2019-06-27
    Description: Describing continuous analog to digital converter with parallel digital output and nonlinear feedback
    Keywords: COMPUTERS
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  • 10
    Publication Date: 2019-06-27
    Description: Plural channel data transmission system with quadrature modulation and complementary demodulation
    Keywords: COMPUTERS
    Format: application/pdf
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