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  • Articles  (4)
  • SEM  (2)
  • Thermal waves  (2)
  • Springer  (4)
  • American Association for the Advancement of Science (AAAS)
  • 2005-2009
  • 1985-1989  (4)
  • Electrical Engineering, Measurement and Control Technology  (4)
Collection
  • Articles  (4)
Source
Keywords
Publisher
  • Springer  (4)
  • American Association for the Advancement of Science (AAAS)
Years
  • 2005-2009
  • 1985-1989  (4)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Synchronous thermal wave IR video imaging for nondestructive evaluation (1989)
    Springer
    Journal of nondestructive evaluation 8 (1989), S. 97-106 
    Details
    ISSN: 1573-4862
    Keywords: Thermal waves ; photo thermal imaging ; infrared methods ; thermal methods ; video processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract We describe a system for real-time processing of infrared video images in synchronism with the time-dependence of the target object's temperature. The system can either be used either with periodic or pulsed heating of the target. With periodic heating, the system operates as if it were a collection of lock-in amplifiers, one for each of the quarter of the million pixels of the image. With pulsed heating, it operates as if it consisted of a similar number of box-car averagers. In both cases, the signal-to-noise ratio and temperature sensitivity of the infrared camera are improved. The technique lends itself to a wide spectrum of NDE applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565634
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of coating physical properties and detection of coating disbonds by time-resolved infrared radiometry (1989)
    Springer
    Journal of nondestructive evaluation 8 (1989), S. 107-120 
    Details
    ISSN: 1573-4862
    Keywords: Thermal waves ; infrared methods ; coating inspection ; bond testing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This paper describes the principles and applications of time-resolved infrared radiometric (TRIR) imaging to characterization of coating systems. Examples are given of its application to the measurement of coating properties such as thickness and thermal diffusivity and to the detection of regions of coating disbond. Results are shown for coatings of different thicknesses, for test specimens containing artificial disbonds, and for thermal barrier coating specimens exhibiting real disbonds. A theoretical model describing the time development of the surface temperature of a coating during step heating is presented and the experimental results show good agreement with this model. Methods for applying the technique for inspection of large areas of coating as would be required in a process control or in service inspection environment are discussed and examples of parallel data acquisition using line heating sources are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565635
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interfacial phenomena and microstructural connectivity in explosively fabricated Y-Ba-Cu-O superconductors (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 3-19 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7 ; explosive consolidation ; SEM ; TEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Measurements of supercurrent transport and current density in explosively fabricated superconducting prototypes have been erratic, with current densities measured to be in excess of 103 A/cm2. This erratic behavior appears to be related to the degree of consolidation achieved for Y-Ba-Cu-O powders and, more specifically, to the connectivity or interfacial structure at individual, contacting, superconducting particles. We have used SEM and TEM to characterize and illustrate some of these features in preliminary superconducting prototypes composed of Y-Ba-Cu-O powder channels consolidated and encapsulated in copper and aluminum matrices by explosively generated shock waves. Observations of grain boundaries and interface phase regions cast some light on the prospects for producing good connectivity through optimizing the consolidation process and process parameters as well as the elimination of surface reactions on particles prior to consolidation, or thermal effects during consolidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617947
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and superconductivity of Bi-(Pb)-Ca-Sr-Cu-O ceramics processed by arc melting (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 501-511 
    Details
    ISSN: 1572-9605
    Keywords: superconductors ; Bi-(Pb)-Ca-Sr-Cu-O ; X-ray diffraction ; electrical resistivity ; critical current density ; SEM ; a.c. susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The Bi-(Pb)-Ca-Sr-Cu-O ceramics of typical cation composition 2 (0.4) 223, presintered at 800°C, are formed by arc melting and rapidly cooling the 2021 superconducting phase, CaO, and Cu2O. The arc-melted samples sintered in air at 840°C exhibit a solid-state structural transformation of the components and a mixture of 2122 and 2223 superconducting phases, and small amounts of Ca2CuO3, Ca2PbO4, and CuO appear. When the arc melting is used as an intermediate stage in the preparation of the high-T c superconductors in this system, a significant increase in density (from 3.7 to 5.7 g/cm3) and in critical current density (from 28 to 60 A/cm2 in zero field and at liquid-nitrogen temperature) is observed, while the critical temperature remains practically unchanged (−104 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627563
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    Paper (German National Licenses)
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