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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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    NASA TECHNICAL REPORTS
  • 2
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    Acoustic emission frequency discrimination (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In acoustic emission nondestructive testing, broadband frequency noise is distinguished from narrow banded acoustic emission signals, since the latter are valid events indicative of structural flaws in the material being examined. This is accomplished by separating out those signals which contain frequency components both within and beyond (either above or below) the range of valid acoustic emission events. Application to acoustic emission monitoring during nondestructive bond verification and proof loading of undensified tiles on the Space Shuttle Orbiter is considered.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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