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  • 1
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    Unknown
    Acoustic transducer apparatus with reduced thermal conduction (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A horn is described for transmitting sound from a transducer to a heated chamber containing an object which is levitated by acoustic energy while it is heated to a molten state, which minimizes heat transfer to thereby minimize heating of the transducer, minimize temperature variation in the chamber, and minimize loss of heat from the chamber. The forward portion of the horn, which is the portion closest to the chamber, has holes that reduce its cross-sectional area to minimize the conduction of heat along the length of the horn, with the entire front portion of the horn being rigid and having an even front face to efficiently transfer high frequency acoustic energy to fluid in the chamber. In one arrangement, the horn has numerous rows of holes extending perpendicular to the length of horn, with alternate rows extending perpendicular to one another to form a sinuous path for the conduction of heat along the length of the horn.
    Keywords: ACOUSTICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Plasma heating for containerless and microgravity materials processing (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method for plasma heating of levitated samples to be used in containerless microgravity processing is disclosed. A sample is levitated by electrostatic, electromagnetic, aerodynamic, or acoustic systems, as is appropriate for the physical properties of the particular sample. The sample is heated by a plasma torch at atmospheric pressure. A ground plate is provided to help direct the plasma towards the sample. In addition, Helmholtz coils are provided to produce a magnetic field that can be used to spiral the plasma around the sample. The plasma heating system is oriented such that it does not interfere with the levitation system.
    Keywords: MATERIALS PROCESSING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Reducing Thermal Conduction In Acoustic Levitators (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Acoustic transducers containing piezoelectric driving elements made more resistant to heat by reduction of effective thermal-conductance cross sections of metal vibration-transmitting rods in them, according to proposal. Used to levitate small objects acoustically for noncontact processing in furnaces. Reductions in cross sections increase amplitudes of transmitted vibrations and reduce loss of heat from furnaces.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-17620 , NASA Tech Briefs (ISSN 0145-319X); 15; 6; P. 120
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Optical Measurement Of Sound Pressure (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Noninvasive technique does not disturb field it measures. Sound field deflects laser beam proportionally to its amplitude. Knife edge intercepts undeflected beam, allowing only deflected beam to reach photodetector. Apparatus calibrated by comparing output of photodetector with that of microphone. Optical technique valuable where necessary to measure in remote, inaccessible, or hostile environment or to avoid perturbation of measured region.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17565 , NASA Tech Briefs (ISSN 0145-319X); 13; 9; P. 50
    Format: text
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    NASA TECHNICAL REPORTS
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