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  • 1970-1974  (2)
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  • 1
    facet.materialart.
    Unknown
    Shock induced ultra-sound absorption in lunar anorthosite (1974)
    In:  Geochemica et Cosmochimica Acta, Supplement 5, Proceedings of the Fifth Lunar Conference, Zagreb, Conseil de l'Europe, vol. 5, no. 3-4, pp. 2939-2943, pp. L02307, (ISSN 0343-5164)
    Details
    Publication Date: 1974
    Keywords: Planetology ; Attenuation ; Quality factor ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
    facet.materialart.
    Unknown
    Ultra sound absorption measurements in rock samples at low temperatures (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A new technique, comparable with the reverberation method in room acoustics, is described. It allows Q-measurements at rock samples of arbitrary shape in the frequency range of 50 to 600 kHz in vacuum (.1 mtorr) and at low temperatures (+20 to -180 C). The method was developed in particular to investigate rock samples under lunar conditions. Ultrasound absorption has been measured at volcanics, breccia, gabbros, feldspar and quartz of different grain size and texture yielding the following results: evacuation raises Q mainly through lowering the humidity in the rock. In a dry compact rock, the effect of evacuation is small. With decreasing temperature, Q generally increases. Between +20 and -30 C, Q does not change much. With further decrease of temperature in many cases distinct anomalies appear, where Q becomes frequency dependent.
    Keywords: GEOPHYSICS
    Type: Zeitschrift fuer Geophysik; 40; 3, 19; 1974
    Format: text
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    NASA TECHNICAL REPORTS
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