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  • 1
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    Fatigue effects on the area sensitivity, dynode gain and anode output for several end-on photomultipliers (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Fatigue effects of incident illumination on area sensitivity, dynode gain stability and anode output for end-on photomultipliers
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Versatile LDV burst simulator (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A device for generating burst signals is reported that can be used to determine whether or not a laser Doppler velocimeter is operating properly. A high frequency signal which corresponds to the information frequency of the laser Doppler velocimeter is modulated by a low frequency signal to provide an envelope for the high frequency signal. The high frequency signal is modulated by any modulator means such as, for example, an analog multiplier. The low frequency signal is added to the modulated signal to provide pedestals for the resulting series of burst pulses. The means are provided for selecting different combinations of these burst signals. Also means are provided for making the burst signals asymmetrical as desired. In addition, means are provided for varying the frequencies, and amplitudes of the information, envelope and pedestal frequency signals in the burst signals.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Photomultiplier area sensitivity measurements using a multicolor display technique. (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Color coded area sensitivity maps of photomultiplier tubes by multicolor display technique, noting focus electrode voltage
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''69, INTERNATIONAL CONGRESS ON INSTRUMENTATION IN AEROSPACE SIMULATION FACILITIES; May 05, 1969 - May 08, 1969; FARMINGDALE, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A versatile burst generator for LDV (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A laser-Doppler velocimeter (LDV) burst generator developed for calibration of an LDV before an actual test is described. This generator uses voltage-controlled oscillators to produce the information frequency up to 1 MHz and the pedestal frequency up to 10 MHz. The amplitude and the frequency of each signal can be adjusted independently, and the generator is capable of producing a single burst or a variety of periodic and aperiodic bursts. Variable symmetry in the burst signal can be introduced to the point of producing the 'double-pulse' burst. An LED display is used for the readout of the information and the pedestal frequencies.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: SOUTHEASTCON ''79; Region 3 Conference and Exhibit; Apr 01, 1979 - Apr 04, 1979; Roanoke, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Burst simulator for laser-Doppler velocimeter (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Device allows for precheck of velocimeter electronics. Device uses voltage-controlled oscillators to generate fundamental frequency and pedestal frequency independently. Magnitude of each signal is adjustable. System allows variable asymmetry in burst signal to point of producing "double-pulse burst."
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11859 , NASA Tech Briefs (ISSN 0145-319X); 2; 1; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Color-coded area sensitivity maps of photomultipliers (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Technique was devised specifically for testing photomultipliers and other photodetectors, but it could also be used to color code any type of mapping data, such as weather or topographical maps, thermal or pressure distributions on reentry surfaces, or any other three-dimensional data to be displayed in two-dimensional form.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-10320
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Rapid measurements of areal sensitivity and areal spectral response of photodetectors (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A flying spot scanning system was used to obtain areal sensitivity and areal spectral response data for nineteen photomultipliers. The efficiency of the electron optics was shown to be dependent upon the type of dynode structure used in the several photomultipliers. From areal sensitivity measurements it was found that the relative spectral response per unit area can vary over the face of a photomultiplier.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Ozone profiles from tethered balloon measurements in an urban plume experiment (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: NASA Langley Research Center used two tethered balloon systems to measure ozone in the general area of Norfolk, Va. The large balloon system which has an altitude range of 1,500 meters was located at Wallops Island, Va., and the smaller balloon which has an altitude range of 900 meters was located at Chesapeake, Va. Each balloon system measured ozone, temperature, humidity, wind speed, and wind direction from ground to its maximum altitude. From these measurements and from the location of the balloon sites, areas of ozone generation and ozone transport may be inferred. The measurements which were taken during August 1979 are discussed as well as the measurement techniques.
    Keywords: GEOPHYSICS
    Type: SOUTHEASTCON''81; Apr 05, 1981 - Apr 08, 1981; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Change in photomultiplier area sensitivity map with wavelength of illumination (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Illumination wavelength effect and supply voltage dependence of photomultiplier area sensitivity map
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ELECTRO-OPTICAL SYSTEMS DESIGN CONFERENCE; May 18, 1971 - May 20, 1971; ANAHEIM, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Photodiode and photomultiplier areal sensitivity anomalies (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Several silicon photodiodes and photomultipliers were tested to determine signal variations as a light spot was scanned over the photosensitive surface of these detectors. Qualitative and quantitative data is presented to demonstrate the areal sensitivity anomalies. These anomalies are related back to the fabrication techniques of the manufacturers.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Southeast Region 3 Conference; Apr 04, 1977 - Apr 06, 1977; Williamsburg, VA
    Format: text
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    NASA TECHNICAL REPORTS
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