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  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1995-1999  (17)
  • 1980-1984
  • 1995  (17)
  • 1
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    A Hydrogen Leak Detection System for Aerospace and Commercial Applications (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Leaks on the space shuttle while on the launch pad have generated interest in hydrogen leak monitoring technology. Microfabricated hydrogen sensors are being fabricated at Case Western Reserve University (CWRU) and tested at NASA Lewis Research Center (LeRC). These sensors have been integrated into hardware and software designed by Aerojet. This complete system allows for multipoint leak monitoring designed to provide leak source and magnitude information in real time. The monitoring system processes data from the hydrogen sensors and presents the operator with a visual indication of the leak location and magnitude. Although the leak monitoring system was designed for hydrogen propulsion systems, the possible applications of this monitoring system are wide ranged. This system is in operation in an automotive application which requires high sensitivity to hydrogen.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-107063 , NAS 1.15:107063 , E-9924 , AIAA PAPER 95-2645 , Joint Propulsion Conference and Exhibit; Jul 10, 1995 - Jul 12, 1995; San Diego, CA; United States
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  • 2
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    A new Fabry-Perot spectrometer for observations of diffuse near-infrared line emission (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We describe a new Fabry-Perot spectrometer that is optimized for the detection of extended, low-surface-brightness line emission from 1.4 to 2.4 microns. The instrument combines high throughput and high sensitivity, yet limits the background radiation falling on the detector. The instrument has a single 20 sec - 200 sec beam and a resolving power lambda/delta(lambda) approximately 2500. The system is background shot-noise limited in the K window and limited by a combination of read noise, dark-current shot noise, and fluctuations in the OH airglow lines in the H window. We present sample data of some of the lowest-surface-brightness H2 line emission in the near infrared obtained to date.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 107; 708; p. 184-192
    Format: text
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  • 3
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    Balances for the measurement of multiple components of force in flows of a millisecond duration (1995)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: This paper reports a new balance for the measurement of three components of force - lift, drag and pitching moment - in impulsively starting flows which have a duration of about one millisecond. The basics of the design of the balance are presented and results of tests on a 15 deg semi-angle cone set at incidence in the T4 shock tunnel are compared with predictions. These results indicate that the prototype balance performs well for a 1.9 kg, 220 mm long model. Also presented are results from initial bench tests of another application of the deconvolution force balance to the measurement of thrust produced by a 2D scramjet nozzle.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Shock Tunnel Studies of Scramjet Phenomena 1993; p 107-112
    Format: text
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  • 4
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    Application of the Langley plot method to the calibration of the solar backscattered ultraviolet instrument on the Nimbus 7 satellite (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The concept of the well-known Langley plot technique, used for the calibration of ground-based instruments, has been generalized for application to satellite instruments. In polar regions, near summer solstice, the solar backscattered ultraviolet (SBUV) instrument on the Nimbus 7 satellite samples the same ozone field at widely different solar zenith angles. These measurements are compared to assess the long-term drift in the instrument calibration. Although the technique provides only a relative wavelength-to-wavelength calibration, it can be combined with existing techniques to determine the drift of the instrument at any wavelength. Using this technique, we have generated a 12-year data set of ozone vertical profiles from SBUV with an estimated accuracy of +/- 5% at 1 mbar and +/- 2% at 10 mbar (95% confidence) over 12 years. Since the method is insensitive to true changes in the atmospheric ozone profile, it can also be used to compare the calibrations of similar SBUV instruments launched without temporal overlap.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; D2; p. 2997-3004
    Format: text
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  • 5
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    DSS-24 microwave holography measurements (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The JPL DSN Microwave Antenna Holography System (MAHST) was applied to the newly constructed DSS-24 34-m beam-waveguide antenna at Goldstone, California. The application of MAHST measurements and corrections at DSS 24 provided the critical RF performance necessary to not only meet the project requirements and goals, but to surpass them. A performance increase of 0.35 dB at X-band (8.45 GHz) and 4.9 dB at Ka-band (32 GHz) was provided by MAHST, resulting in peak efficiencies of 75.25 percent at X-band and 60.6 percent at Ka-band (measured from the Cassegrain focus at f1). The MAHST enabled setting the main reflector panels of DSS 24 to 0.25-mm rms, making DSS 24 the highest precision antenna in the NASA/JPL DSN. The precision of the DSS-24 antenna (diameter/rms) is 1.36 x 10(exp 5), and its gain limit is at 95 GHz.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Telecommunications and Data Acquisition Report; p 252-270
    Format: application/pdf
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  • 6
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    Mid-infrared array camera on the KAO (1995)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The University of California at Santa Cruz and the NASA Ames Research Center have developed a mid-infrared Si:Ga 128 x 128 array camera. The camera has been used on several flights on the KAO to obtain data in the mid-infrared wavelength (4-8 micron) range. At the f/17 bent Cassegrain focus, the pixel spacing is 1.6 arcsec, resulting in a FOV of 3.4 arcmin. The bandpass of the camera is determined by a set of 4 fixed filters and a 4-8 micron CVF. Camera performance of 92mJy/square arcsec/minute has been achieved, but is far from optimal. Realistic improvements to the camera and pointing stability on the KAO in the near future should increase the camera's sensitivity on future flights by 5-10x.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Society of the Pacific, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust, Volume 73; p 583-586
    Format: text
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  • 7
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    HIFOGS: Its design, operations and calibration (1995)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The High-efficiency, Infrared Faint Object Grating Spectrometer (HIFOGS) provides spectral coverage of selectable portions of the 3 to 18 micron range at resolving powers from 00 to 1000 using 120 Si/Bi detectors. Additional coverage to 30 microns is provided by a bank of 32 Si:P detectors. Selectable apertures, gratings and band-pass filters provide flexibility to this system. Software for operation of HIFOGS and reduction of the data runs on a MacIntosh computer. HIFOGS has been used to establish celestial flux standards using 3 independent approaches: comparison to star models, comparisons to asteroid models and comparisons to laboratory blackbodies. These standards are expected to have wide application in astronomical thermal-infrared spectroscopy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Society of the Pacific, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust, Volume 73; p 573-578
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  • 8
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    The Yerkes Observatory 60-channel far infrared camera for the Kuiper Airborne Observatory (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Yerkes Observatory Far Infrared Camera employs a two-dimensional, 60-detector array of (3)He-cooled silicon bolometers for broadband imaging in the spectral range of 40 to 240 microns. Four interchangeable filters have effective wavelengths of 60, 100, 160, and 200 microns. Three interchangeable lens sets give pixel sizes of 17, 27, and 45 in. Signals are processed through nitrogen-temperature JFET source-follower amplifiers, warm preamplifiers, and digital signal processors, and the system is controlled through a graphical user interface on a Macintosh computer. The camera has been used to image a wide variety of galactic and extragalactic far infrared sources.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Society of the Pacific, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust, Volume 73; p 535-536
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  • 9
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    The Caltech airborne submillimeter SIS receiver (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: We have constructed a sensitive submillimeter receiver for the NASA Kuiper Airborne Observatory (KAO) which at present operates in the 500-750 GHz band. The DSB receiver noise temperature is about 5 h nu/k(sub B) over the 500-700 GHz range. This receiver has been used to detect H2O(18)O, HCl, and CH in interstellar molecular clouds, and also to search for C(+) emission from the highly redshifted galaxy (z = 2.3) IRAS 10214.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Society of the Pacific, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust, Volume 73; p 555-558
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  • 10
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    Continuous phase and amplitude holographic elements (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method for producing a phase hologram using e-beam lithography provides n-ary levels of phase and amplitude by first producing an amplitude hologram on a transparent substrate by e-beam exposure of a resist over a film of metal by exposing n is less than or equal to m x m spots of an array of spots for each pixel, where the spots are randomly selected in proportion to the amplitude assigned to each pixel, and then after developing and etching the metal film producing a phase hologram by e-beam lithography using a low contrast resist, such as PMMA, and n-ary levels of low doses less than approximately 200 micro-C/sq cm and preferably in the range of 20-200 micro-C/sq cm, and aggressive development using pure acetone for an empirically determined time (about 6 s) controlled to within 1/10 s to produce partial development of each pixel in proportion to the n-ary level of dose assigned to it.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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