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  • INSTRUMENTATION AND PHOTOGRAPHY  (34)
  • Cell & Developmental Biology  (31)
  • Engineering General  (24)
  • Organic Chemistry
  • 1990-1994  (39)
  • 1985-1989  (38)
  • 1975-1979  (33)
  • 1840-1849  (1)
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  • 1
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    Backscattered ultraviolet measurements of ozone 1970-2000 - An overview (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The history of the Backscattered Ultraviolet Experiment (BUV) is recounted and related future efforts are discussed. Satellite measurement of backscattered UV radiation will be the major source of long-term global information about total ozone and ozone profiles for the rest of this century. These measurements started with the BUV experiment flown on Nimbus 4 from 1970 to 1977 and are presently being continued with the Solar and Backscattered Ultraviolet/Total Ozone Mapping Spectrometer (SBUV/TOMS) launched on Nimbus 7 in 1978. NOAA's improved version (SBUV/2) is to fly until sometime in the 1990s and NASA plans to fly an SBUV/2 on the Upper Atmosphere Research Satellite in 1989. Differences between these instruments and in the algorithms for deriving ozone amounts from these data sets are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 2
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    Evaluation of a Quartz Bourdon Pressure Gage of Wind Tunnel Mach Number Control System Application (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A theoretical and experimental study was undertaken to determine the feasibility of using the National Transonic Facility's high accuracy Mach number measurement system as part of a closed loop Mach number control system. The theoretical and experimental procedures described are applicable to the engineering design of pressure control systems. The results show that the dynamic response characteristics of the NTF Mach number gage (a Ruska DDR-6000 quartz absolute pressure gage) coupled to a typical length of pressure tubing were only marginally acceptable within a limited range of the facility's total pressure envelope and could not be used in the Mach number control system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-88991 , NAS 1.15:88991
    Format: application/pdf
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  • 3
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    A new multipoint thin-film diagnostic technique for fluid dynamic studies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A multielement hot-film sensor has been developed with closely-spaced elements (2.5 mm) in the streamwise direction. In addition to boundary-layer transition detection, the output of these sensors can reveal the locations of boundary-layer separation and reattachment by a 180 deg phase difference in the 0-200-Hz frequency bandwidth between sensor elements on each side of either the separation or reattachment point. This paper describes the features of multielement hot-film sensor arrays and discusses results from their application to a number of low-speed and transonic airfoil tests.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: SAE PAPER 881453
    Format: text
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  • 4
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    Kitt Peak speckle camera (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The speckle camera in regular use at Kitt Peak National Observatory since 1974 is described in detail. The design of the atmospheric dispersion compensation prisms, the use of film as a recording medium, the accuracy of double star measurements, and the next generation speckle camera are discussed. Photographs of double star speckle patterns with separations from 1.4 sec of arc to 4.7 sec of arc are shown to illustrate the quality of image formation with this camera, the effects of seeing on the patterns, and to illustrate the isoplanatic patch of the atmosphere.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 18; Apr. 1
    Format: text
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  • 5
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    An analog technique for the measurement of damping from transient decay signals (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A tracking filter that includes an output that is logarithmically proportional to the amplitude of the filtered signal is used to measure the damping exponent of a transient decay. This method is analogous to the digital technique referred to as the moving-block or peak-plot method. The method is simple to use and quite accurate, avoids the numerical computations associated with similar digital techniques, but is constrained by the poor time-domain response characteristics of commercial tracking filters presently available.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-73121 , A-6535
    Format: application/pdf
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  • 6
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    Spectroradiometric calibration techniques in the far ultraviolet - A stable emission source for the Lyman bands of molecular hydrogen (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problems associated with making accurate spectroradiometric measurements in the far UV region are sketched briefly. The equipment and methods that were developed for providing absolute sensitivity calibration of an Apollo 17 far UV spectrometer are described. The absolute reference standards were photoelectric diodes calibrated at the National Bureau of Standards. A complete vacuum optical facility, which included a premonochromator and stable UV light sources, was developed to calibrate the Apollo 17 instrument, and it has been used for a number of other tasks. Absolute radiometric calibrations between about 1200 and 1700 A were performed with an absolute accuracy of + or - 10%. The light source, which was designed to provide a very stable light output, is a low-pressure molecular hydrogen lamp in which the pressure is stabilized by thermal control of uranium hydride powder.-
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 14; Sept
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  • 7
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    Limitations of the narrow-angle convergent pair (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Spatial triangulations and topographies of the Martian surface derived from Viking Orbiter pictures depend on the use of symmetric narrow-angle convergent pairs. The overlap in each pair is close to 100 percent and the ground principal points virtually coincide. The analysis of this paper reveals a high degree of indeterminacy in such pairs and at least in part explains the rather disappointing precision of the associated spatial triangulations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Photogrammetric Engineering and Remote Sensing; 43; Dec. 197
    Format: text
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  • 8
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    Comprehensive analysis of gratings for ultraviolet space instrumentation (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Comprehensive measurements in the vacuum UV range of 1200-3000 A of efficiency, polarization, and scattering of classically ruled and photoresist gratings are reported. The results show that the art of ruling gratings for vacuum UV use has reached a high level of sophistication and that careful analysis of grating properties can lead to useful improvement of the ruling art.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 17; Oct. 1
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  • 9
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    Calibration of a universal indicated turbulence system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Theoretical and experimental work on a Universal Indicated Turbulence Meter is described. A mathematical transfer function from turbulence input to output indication was developed. A random ergodic process and a Gaussian turbulence distribution were assumed. A calibration technique based on this transfer function was developed. The computer contains a variable gain amplifier to make the system output independent of average velocity. The range over which this independence holds was determined. An optimum dynamic response was obtained for the tubulation between the system pitot tube and pressure transducer by making dynamic response measurements for orifices of various lengths and diameters at the source end.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-74023
    Format: application/pdf
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  • 10
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    A quadrant-CCD star tracker (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The characteristics of a quadrant-CCD designed for pointing and tracking are discussed with reference to its use in an adaptive optics program. The quadrant-CCD is used to correct stellar image motion proceeding from atmospheric turbulence by means of a system in which a sensor measures the image offset and sends data to a high-speed tip/tilt mirror. The design and control of the device are detailed, including four 100-micron-square pixels, the quadrant architecture, controller electronics, and data acquisition computer and interface. The transfer function is set forth in the x and y directions, and transfer curves are shown. A laboratory simulation of random image motion was conducted to evaluate the performance of the quadrant-CCD as an image motion sensor, and the experimental results are presented. The suitability of the quadrant-CCD for space-based pointing and tracking uses is demonstrated by this test and two earlier theoretical studies. Some future developments which improve performance capabilities are mentioned.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Charge-Coupled Devices and Solid State Optical Sensors; Feb 12, 1990 - Feb 14, 1990; Santa Clara, CA; United States
    Format: text
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