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  • 1
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    CCDs at Lick Observatory (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improved sensitivity to light and uniformity of response has been obtained using various surface treatments of thinned CCDs. Procedures are described and some results are shown. The Lick Observatory data acquisition system is briefly described. A new thermoelectrically-cooled CCD camera for telescope guiding has been designed and built. The camera is described and preliminary results at the telescope are given.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 2
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    Correlation of individual cosmic ray nuclei with the observation of light flashes by Apollo astronauts (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A nuclear emulsion detector known as the Apollo Light Flash Moving Emulsion Detector (ALFMED) was designed: (1) to record tracks of primary cosmic rays; (2) to provide time-of-passage information via a relative plate translation technique; (3) to provide particle trajectory information; and (4) to fit into a masklike device that could be located about the head and eyes of an astronaut. An ALFMED device was worn by an astronaut observing light flashes for 60 minutes on each of the last two Apollo missions. During the Apollo 17 experiment seventeen separate flashes were reported by the observer. With one-third of the total plate area completely analyzed, two definite correlations have been found between Z greater than 8 cosmic ray nuclei traversing an eye and the reports of visual sensations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
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  • 3
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    Instrumentation for one-way satellite PTTI applications (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A review of general principles and operational procedures illustrates how the typical passive user and omni receiving antenna can recover Precise Time and Time Interval (PTTI) information from a low altitude navigation satellite system for clock calibration and synchronization. Detailed discussions of concepts and theory of the receiver design are presented. The importance of RF correlation of the received and local PN encoded sequences is emphasized as a means of reducing delay uncertainties of the instrumentation to values compatible with nanosecond to submicrosecond PTTI objectives. Two receiver configurations were fabricated for use in satellite-to-laboratory experiments. In one receiver the delay-locked loop for PN signals synchronization used a dithered amplitude detection process while the second receiver used a complex sums phase detection method for measurement of delay error. The necessity for compensation of Doppler shift is discussed. Differences in theoretical signal acquisition and tracking performance of the design concepts are noted.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Proc. of the 5th Ann. NASA and DOD Precise Time and Time Interval Planning Meeting; p 185-213
    Format: application/pdf
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  • 4
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    Global timing systems of nanosecond accuracy using satellite references (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: High accuracy timing systems using satellite atomic clocks
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-107317 , TG-1086
    Format: application/pdf
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  • 5
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    CCD use at Lick Observatory (1984)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The CCD detector and data handling system in regular use at Lick Observatory are described. A grism system has been installed on the automated Cassegrain spectrograph at the Shane 3-meter telescope. A very compact CCD cooling system has been developed using a commercial gas expansion refrigerator; the dewar is a cylinder 15 cm in diameter and 6 cm high. The data acquisition computer, an LSI 11/23 with 256 kbyte RAM, 160 Mbyte Winchester disk, and color video display, provides for FITS format magnetic tape storage as well as preliminary analysis of images and spectra. The 3-meter telescope spectrographic system uses a 500 x 500 pixel thinned CCD. Design information and operational experience for these detector systems are presented along with some results to illustrate the quality of the data being obtained and the current limitations of the CCD detectors and data system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Instrumentation in astronomy V; Sep 07, 1983 - Sep 09, 1983; London
    Format: text
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  • 6
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    Lick Observatory charge-coupled-device data acquisition system (1987)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The Lick Observatory CCD data acquisition system is described, with some observational results to illustrate the system capability. The electronics for the CCD are subdivided into those attached to the dewar, a 'smart' controller near the dewar, and a computer connected by serial link to the smart controller. Software for the controller is in assembler code, while the software for data acquisition and on-line analysis is written in C and uses the UNIX operating system. The computers and controllers are programmed to recognize and operate several different types of CCD. Three separate instruments that use the CCDs are described briefly, together with examples of the data they produce.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering (ISSN 0091-3286); 26; 795-805
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  • 7
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    Transition-radiation-Compton-scattering detector for very relativistic nuclei (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper presents the design and predicted performance of a large acceptance (2 sq m sr) transition-radiation-Compton-scattering detector system which can be used to measure energy spectra up to several thousand Gev/nucleon for nuclei with Z between 6 and 28, as well as up to 40,000 GeV/nucleon for He. The following circumstances made such a detector system practicable: (1) transition radiation output is proportional to the square of particle charge; (2) output varies at least as rapidly as the square of Lorentz factor over the range from several hundred to several thousand.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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