AbstractInvestigations of three methods for non-contact temperature measurement are presented. Ideal gas thermometry was realized by using laser-induced fluorescence to measure the concentration of mercury atoms in a Hg-Ar mixture in the vicinity of hot specimens. Emission polarimetry was investigated by measuring the spatially resolved intensities of polarized light from a hot tungsten sphere. Laser polarimetry was used to measure the optical properties, emissivity, and in combination with optical pyrometry, the temperature of electromagnetically levitated liquid aluminum. The ideal gas method is difficult to carry out on earth. It would be applicable to temperature measurements on any material in the quiescent gas environment that may be achieved in space-based containerless experiments, if a convenient method for more accurate and precise density measurements by laser scattering were available. The precision of temperature measurements based on the ideal gas law was ± 2.6% at 1500 – 2300K. The polarized emission technique has the capability to determine optical properties and/or spectral emissivities of specimens over a wide range of wavelengths with quite simple instruments. Its accurate use requires a high degree of specimen stability, position control, and modelling of the experimental measurements. These requirements are avoided by the laser polarimetric method for emissivity measurements which is well developed, uses quite simple instruments, provides nearly instantaneous results, and has been used to measure optical properties and emissivities for a variety of liquids and solids at high temperatures. Further development of the laser polarimetric method is in progress for non-contact temperature measurements in containerless space-based experiments, by combining polarimetric measurements of emissivity with spectral radiation pyrometry.


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    Titel :

    Non-contact temperature measurement


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1991-01-01


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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