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  • 1
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    Contribution to CCN Workshop report from University of Wyoming group (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The group's CCN counter is described. It is a static, horizontal, parallel plate thermal gradient diffusion chamber. Examples of the application of the CCN are presented and include the CCN spectra measured during the winter of 1978-79 near Elk Mountain, Wyoming. Comparisons of droplet concentrations derived from upwind CCN spectra are covered.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Desert Research Inst. The Third Intern. Cloud Condensation Nuclei Workshop; p 11-13
    Format: text
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  • 2
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    Comparing dry aerosol size measurements (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Two instruments were used to size dry aerosols for the CCN experiments: the Naval Research Laboratory (NRL) instrument which uses an electrical mobility analyzer to separate the aerosol size fractions and a diffusion chamber to grow and count the particles and the University of Wyoming (WYO) aerosol monitoring system. Measurements from these two systems were usually found to be in agreement during the CCN Workshop. Two examples are presented to compare aerosol size distribution measurements of the two instruments: experiment 8 (monodisperse NaCl) and experiment 27 (polydisperse AgI). Differential (dN/dR) and cumulative plots are shown for both instruments for experiment 8 and experiment 27; also shown are Aitken particle measurements for comparison.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Desert Research Inst. The Third Intern. Cloud Condensation Nuclei Workshop; p 106-107
    Format: text
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  • 3
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    A high data rate recorder for astronomy (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A magnetic tape recorder developed for the special requirements of radio astronomy and geodesy is described. These requirements include a high bit packing density and long record times. The current version of this longitudinal recorder used by the Very Long Baseline Array (VLBA) records 5.5 Terabits on a 14-in diameter reel of inch-wide tape. A maximum record rate of 256 Mb/s is achieved in the VLBA configuration with one recorder operating at 4 ms and utilizing 32 of the heads in a single stack. The VLBA recorders have been tested using a longitudinal density of 2.25 fr/micron; 448 data + 56 system tracks are recorded in 14 passes, each lasting 50 min, for a total record time (at 128 Mb/s) of 12 h on 14-in diameter reel of inch-wide 13-microns-thick D1-equivalent tape.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Magnetics (ISSN 0018-9464); 27; 3455-346
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  • 4
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    Nimbus 4 Michelson interferometer (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Michelson interferometer onboard Nimbus 4 satellite for recording earth IR emission spectrum
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; TROPHYSICAL JOURNAL
    Format: text
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  • 5
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    Entopistic scintillators (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Trajectories of cosmic rays through a balloon-borne experiment will be determined by pulse height analyzing the signals from each of the two or more phototubes coupled to each scintillator. Thin or tapered scintillators produce sufficiently strong gradients of phototube signal with respect to scintillation position that position uncertainties of about 1 cm can be achieved over 1-sq-m areas. Calculations and some test results for entopistic, or position determining, scintillators are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 6
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    Power meter for optical efficiency measurements of laser-induced plasmas (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A power meter was constructed to measure the power being deposited in transient laser-induced plasmas (LIP). The design rejects the radiation scattered from the laser beam by the LIP and that transmitted past the LIP. The power meter is constructed from a small metal-capped flask placed in an evacuated chamber. The steady-state heat production in the flask is determined from measurements of the temperature gradient on a thermal resistance connecting the top of the flask with a heat sink. The design worked well and should be applicable to a wide variety of situations if the dimensions of the system are adjusted to compensate for power levels substantially different from those used here.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 26; 4319-432
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  • 7
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    Precise time transfer using MKIII VLBI technology (1984)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: It is well known that Very Long Baseline Interferometry (VLBI) is capable of precise time synchronization at subnanosecond levels. This paper deals with a demonstration of clock synchronization using the MKIII VBLI system. The results are compared with clock synchronization by traveling cesium clocks and GPS. The comparison agrees within the errors of the portable clocks (+ 5 ns) and GPS(+ or - 30 ns) systems. The MKIII technology appears to be capable of clock synchronization at subnanosecond levels and appears to be very good benchmark system against which future time synchronization systems can be evaluated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NRL Proc. of the 15th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 443-455
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  • 8
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    Compression mass gauge testing in a liquid hydrogen dewar (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper describes testing that was conducted using a mass gauge in a liquid hydrogen environment. The mass gauge, herein referred to as the 'compressibility gauge,' is being developed as a means to accurately determine the mass of liquid contained in a tank in a low-gravity environment. The concept is based on the thermodynamic principle that the pressure of gas or vapor changes when its volume changes. Previous work has been conducted by Southwest Research Institute in collaboration with NASA Lewis Research Center. This consisted of testing the concept with water and other cryogenic simulant fluids. The purpose of conducting liquid hydrogen tests is to test the concept in actual cryogenic conditions, and address hardware issues that arise in fabricating a test article for use in liquid hydrogen.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-198366 , E-9781 , NAS 1.26:198366
    Format: application/pdf
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  • 9
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    Vacuum ultraviolet sensitive total radiation gage system. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Windowless total radiation gauge for shock tube measurements of high temperature gas radiance
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 10
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    Minimum crew space habitability for the lunar mission (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-21
    Description: Psychological effects of restricted workspace and work-rest cycle on crew for lunar mission
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-2065
    Format: application/pdf
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