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  • Cell & Developmental Biology  (241)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1980-1984  (439)
  • 1900-1904  (1)
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  • 1
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    Laboratory analysis of techniques for remote sensing of estuarine parameters using laser excitation (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The theoretical concepts underlying remote sensing of estuarine parameters using laser excitation are examined. The concepts are extended to include Mie scattering as a measure of the total suspended solids and to develop the water Raman signal as an internal standard. Experimental validation of the theory was performed using backscattered laser light from a laboratory tank to simulate a remote-sensing geometry. Artificially prepared sediments and biological cultures were employed to check specific aspects of the theory under controlled conditions. Natural samples gathered from a variety of water types were also analyzed in the tank to further enhance the simulation. The results indicate that it should be possible to remotely quantify total suspended solids, dissolved organics, attenuation coefficient, chlorophyll a, and phycoerythrin in estuarine water using laser excitation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 22; Jan. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Nimbus-6 and -7 Earth Radiation Budget (ERB) sensor details and component tests (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Construction details and operating characteristics are described for the thermopile (used in the solar and fixed-Earth channels) and the pyroelectric detector (used in the Earth-scanning channels) carried on the Nimbus 6 and the Nimbus 7 satellites for gathering Earth radiation budget data. Properties of the black coating for the detectors, and sensor testing and calibration are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-83906 , NAS 1.15:83906 , G-82F2002
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Solar disk sextant (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: This paper presents the conceptual design of an instrument, called the solar disk sextant, to be used in space to measure the shape and the size of the sun and their variations. The instrumental parameters required to produce sufficient sensitivity to address the problems of solar oblateness, solar pulsations, and global size changes of climatic importance are given.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 23; 1235-123
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Stratospheric and Mesospheric Sounder (SAMS) experiment on Nimbus 7 (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 232-233
    Format: text
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  • 5
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    Solar disk sextant optical configuration (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: In this paper the performance of a plausible configuration for the solar disk sextant, an instrument to be used to monitor the solar diameter, is evaluated. Overall system requirements are evaluated, and tolerable uncertainties are obtained. It is concluded that by using a beam splitting wedge, a folded optics design can be used to measure the solar diameter to an accuracy of 10 to the -6th, despite the greater aberrations present in such optical systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 23; 1230-123
    Format: text
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  • 6
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    Study of Thematic Mapper and Multispectral Scanner Data Applications (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: The U.S. Geological Survey EROS Data Center evaluated the utility of LANDSAT multispectral scanner (MSS) and Thematic Mapper (TM) data for natural resource assessment and land cover information, emphasizing manual interpretation and digital classification of the data for U.S. Department of the Interior applications. In most cases, substantially more information was derived from TM data than from MSS data. The test areas included Washington, D.C. and prairie regions of South Dakota and Kansas.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center LANDSAT-4 Sci. Invest. Summ., Including Dec. 1983 Workshop Results, Vol. 2; p 129-132
    Format: text
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  • 7
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    Active nutation controller (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An apparatus is described for controlling nutation motion in a spinning body, comprised of an angular accelerometer with its input axis perpendicular to the spin axis of the body, a flywheel with an axis of rotation perpendicular to the axis of the accelerometer and to the spin axis of the body, and a motor for driving the flywheel to attenuate or build nutation. The motor is controlled by circuitry that monitors the output of the angular accelerometer and drives the motor clockwise or counterclockwise during predetermined nutation angles synchronized to the zero crossover points of the accelerometer signal centered about the nutation peaks. The motor drive is phased to damp nutation motion to zero for stabilization. To increase the noise immunity of the system, when the output of the accelerometer falls below a threshold level, the circuitry operates in an open loop, beat mode where data representing the last accelerometer signal that exceeded that threshold level is stored, and the motor drive is controlled by the stored data. In a second version, the motor is controlled to supply a predetermined amount of nutation motion to a body undergoing testing on a spin table for energy dissipation evaluation. In each version, the use of an angular accelerometer rather than a linear accelerometer or gyro to monitor nutation enables placement of the nutation control apparatus at any location relative to the spin axis of the body requiring only crude orientation and no calibration.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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  • 8
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    Instrument manual for the retarding ion mass spectrometer on Dynamics Explorer-1 (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The retarding ion mass spectrometer (RIMS) for Dynamics Explorer-1 is an instrument designed to measure the details of the thermal plasma distribution. It combines the ion temperature determining capability of the retarding potential analyzer with the compositional capabilities of the mass spectrometer and adds multiple sensor heads to sample all directions relative to the spacecraft ram direction. This manual provides a functional description of the RIMS, the instrument calibration, and a description of the commands which can be stored in the instrument logic to control its operation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-82484 , NAS 1.15:82484
    Format: application/pdf
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  • 9
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    For the detection of subkiloelectron-volt X-rays (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A large-area, imaging gas scintillation proportional counter (IGSPC) has been constructed for use in X-ray astronomy. The IGSPC consists of a gas scintillation proportional counter (GSPC) with a 1-micron polypropylene window coupled to a multiwire proportional counter (MWPC) via a calcium fluoride window. The MWPC, filled with a mixture of argon, methane, and tetrakis (dimethylamino) ethylene, detects the UV photons emitted by the xenon gas in the GSPC. Over a sensitive area of 21 sq cm, the instrument has a measured energy resolution of 17.5% (FWHM) and 1.9 mm (FWHM) spatial resolution at 1.5 keV.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 10
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    The Mount Wilson magnetograph (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In the summer of 1957, an instrument quite similar to the prototype solar magnetograph described by Babcock (1953) was installed at the 150-foot tower telescope at the Mount Wilson Observatory, and daily magnetograph observations of the full disk of the sun were started. During the following years, the instrument was modified and improved on several occasions. The present investigation is concerned with the present state of the magnetograph, which was largely rebuilt during 1981. Attention is given to the spectrograph entrance slit, the diffraction grating, the exit slit, the employed microprocessor, the setup procedure, the magnetic signal, the Doppler signal, and a solar magnetogram.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Solar Physics (ISSN 0038-0938); 87; Aug. 198
    Format: text
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