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  • INSTRUMENTATION AND PHOTOGRAPHY  (1,456)
  • 1975-1979  (1,189)
  • 1960-1964  (267)
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  • 1
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    Use of piezoelectric multicomponent force measuring devices in fluid mechanics (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The characterisitics of piezoelectric multicomponent transducers are discussed, giving attention to the advantages of quartz over other materials. The main advantage of piezoelectric devices in aerodynamic studies is their ability to indicate rapid changes in the values of physical parameters. Problems in the accuracy of measurments by piezoelectric devices can be overcome by suitable design approaches. A practical example is given of how such can be utilized to measure rapid fluctuations of fluid forces exerted on a circular cylinder mounted in a water channel.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75444
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Spectral transformation in the SOFI complex for processing photographic images on the ES computer, part 1 (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A description is given of three programs catalogued in the form of object modules in the library of a system for processing photographic images computer. PFT is the subprogram of the multi-dimensional BPF of real-valued information, in the operative computer memory. INRECO is a subprogram-interface between the real and complex formats for representing two-dimensional spectra and images. FFT2 is a subprogram for calculating the correlation functions of the image using the previous subprograms.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75632-PT-1 , PR-394
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    NASA's present and future sensor technology developments (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's overall sensing, data acquisition, and instrumentation programs are reviewed. The review shows that the trends in advanced sensor technology involve increased use of solid-state sensors, multiapplication sensors, standardized instrumentation, and miniaturized detectors. Examples are given of several new technologies, showing how improvements in sensor operational capability (such as enhanced sensitivity and spectral range) derived from these advances have resulted in relaxed spacecraft stability requirements, mission time savings, and savings in weight, size, and power. The introduction of multiapplication sensors and standardized instrumentation will result in measurement cost reduction and improved compatibility with standardized spacecraft.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 76-977 , Systems Design Driven by Sensors; Oct 18, 1976 - Oct 20, 1976; Pasadena, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Heyman wins third IR-100 award (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-NEWS-RELEASE-78-147 , P78-10152
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Analytical and test equipment: A compilation (1975)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A compilation is presented of innovations in testing and measuring technology for both the laboratory and industry. Topics discussed include spectrometers, radiometers, and descriptions of analytical and test equipment in several areas including thermodynamics, fluid flow, electronics, and materials testing.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-SP-5972(03)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Semiconductor millimeter and centimeter wave radiometer for the study of the radiation of an underlying surface (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A theoretical and experimental investigation of a superheterodyne radiometer system with input frequency converter and intermediate frequency modulation is presented. Conditions are found, at which the temperature sensitivity of the device does not deteriorate. A sensitivity function to external parameters (temperature, heterodyne power) of a radiometer system with intermediate frequency modulation and a Schottky diode frequency converter is presented and calculated. Use of a frequency converter at the second harmonic of the heterodyne permitted simplication of the radiometer design and the use of a semiconductor heterodyne. A 3 cm range intermediate frequency amplifier permitted the use of centimeter wave radiometer signals. Fluctuation sensitivity of radiometers with a 1 sec time constant is 0.3 K at 3.4 mm and 0.06 K at 3 cm.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75671 , PR-321
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Application of multispectral color photography to flame flow visualization (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: For flames of short duration and low intensity of radiation a spectroscopical flame diagnostics is difficult. In order to find some other means of extracting information about the flame structure from its radiation, the feasibility of using multispectral color photography was successfully evaluated. Since the flame photographs are close-ups, there is a considerable parallax between the single images, when several cameras are used, and additive color viewing is not possible. Each image must be analyzed individually, it is advisable to use color film in all cameras. One can either use color films of different spectral sensitivities or color films of the same type with different color filters. Sharp cutting filters are recommended.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75382 , DLR-MITT-74-23
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Use of computers to exclude the influence of radiometer instability upon measurement results (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A radiometer, practically insensitive to great fluctuations in the equipment amplification coefficient, was developed by dividing the useful signal by a reference signal and modulating the two signals at different frequencies. The signals are simultaneously separated by corresponding synchronous detectors and recorded over two channels. The operation is simplified by replacing the continuous signals by a sampling of discrete values, and using a digital computer. The four steps involved in the process are described and a block diagram is included. This technique not only directly connects the radiometer with the computer, but also records all data provided by the control and signal channels.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75374
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Differential laser absorption monitoring of the atmosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: In the airborne detection system of atmospheric constituents and pollutants described, double-ended differential absorption measurement is accomplished by rapidly current tuning the wavelength of a PbSSe diode laser across a single line of the species under consideration. As the laser wavelength sweeps periodically across the absorption line, the laser beam is amplitude modulated and is then synchronously detected. With this technique, a minimum detectable differential transmission of 0.02 percent is obtained for a 1-sec integration time.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Plenary Meeting; May 29, 1978 - Jun 10, 1978; Innsbruck; Austria
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Space Photography 1977 Index (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An index is provided to representative photographs and transparencies available from NASA. Subjects include spacecraft, astronauts, lunar surface, planets and outer space phenomena, earth observations, and aviation. High altitude aircraft infrared photographs are included along with artists' conceptions of space shuttle and space colonies.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-74628
    Format: application/pdf
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