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  • 1
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    Unknown
    Rotation of ultrasonically levitated glycerol drops (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Ultrasonic levitation is used to suspend single millimeter-size glycerol drops in a rectangular chamber. Audio-frequency laterally standing waves set up in the chamber are used to torque the suspended drops. The shape evolution of the drop under the combined effect of centrifugal forces and the acoustic radiation stress, along with its angular velocity are monitored, using video imaging and light scattering techniques. The results show good qualitative agreement with the theoretically predicted shape evolution as a function of angular velocity.
    Keywords: MATERIALS PROCESSING
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 90; 1502-150
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Force on a heated sphere in a horizontal plane acoustic standing wave field (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The force on a heated sphere in a horizontal plane acoustic standing wave field is the subject of this investigation. The heated sphere produces a thermal gradient in the resonance chamber. The force on the sphere in a direction perpendicular to that of gravity is measured. This force is enhanced in the region near the pressure node, and is weakened in the region near the pressure antinode. Measurements of the force on a heated sphere with sound pressure levels between 148 and 156 dB are presented.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 77; 1686-169
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Acoustic Position Servosystem (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Servosystem automatically centers levitated objects within given volume.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15936 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 570
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Acoustic Sorter for Small Parts (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Sorting system uses acoustic reasonance chamber, detects, and rejects anomalous parts on automated assembly line. System particularly suited to small nuts, bolts, pins, and assemblies which previously required expensive three dimensional television-monitoring systems to prevent misfeeds.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15913 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 419
    Format: text
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    NASA TECHNICAL REPORTS
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