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  • 1
    Electronic Resource
    Electronic Resource
    A new technique for the measurement of radiance temperature at the melting point (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 485-494 
    Details
    ISSN: 1572-9567
    Keywords: high-speed pyrometry ; high temperature ; melting ; pulse heating ; radiance temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the radiance temperature of metals at their melting point received wide attention recently on account of controversial results obtained in different laboratories. During further investigations at IMGC, a new technique for radiance temperature measurements at the melting point was perfected, with numerous experiments performed at the melting point of niobium. The new technique consists in bringing the material to the melting point and interrupting the flow of current just before the specimen is destroyed. Using this method the melting plateau may be repeated several times using the same specimen. Repeatibility studies may be performed, and changes in the surface structure of the material may be evaluated. Typical results of this new technique are presented, along with a complete description of this new measurement method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566047
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radiance temperatures (at 658 and 898 nm) of niobium at its melting point (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 495-510 
    Details
    ISSN: 1572-9567
    Keywords: high-speed pyrometry ; high temperature ; melting ; niobium ; normal spectral emissivity ; pulse heating ; radiance temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Radiance temperatures (at 658 and 898 nm) of niobium at its melting point were measured by a pulse-heating technique. A current pulse of subsecond duration was imparted to a niobium strip and the initial part of the melting plateau was measured by high-speed pyrometry. Experiments were performed with two techniques and the results do not indicate any dependence of radiance temperature (at the melting point) on initial surface or system operational conditions. The average radiance temperature at the melting point of niobium is 2420 K at 658 nm and 2288 K at 898 nm, with a standard deviation of 0.4 K at 658 nm and 0.3–0.6 K at 898 nm (depending on the technique used). The total uncertainty in radiance temperature is estimated to be not more than ±6 K. The results are in good agreement with earlier measurements at the National Institute of Standards and Technology (USA) and confirm that both radiance temperature and normal spectral emissivity (of niobium at its melting point) decrease with increasing wavelength in the region 500–900 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566048
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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