HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS

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HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS ( handbook-onphysics-and-chemistry-rare-earths )

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TABLE 1 Summary of the Advantages, Disadvantages, and General Applications of High-Resolution Electrical, Near- and Far-Field Thermal Techniques (An Indicative Reference Is Included for Each Technique) Typical Resolution dx dT dT Method Principle (mm) (K) (ms) Advantages Disadvantages HIGH-resolution thermal measurement techniques in micrometer–nanometer range Infrared thermography (Maldague and Marinetti, 1996) Plank blackbody emission 10 101 10 l Well-implemented commercial technique l Detector saturation at high temperatures l Difficulties on the precise estimation of the l Provides temperature image profile of the surface emissivity of the surface materials, that is function of wavelength and temperature (Ferreira et al., 2013) (not all “hot bodies” are perfect blackbodies, in the physical meaning of the term) (Allison and Gillies, 1997) l Spatial resolution for the temperature detection, which is Rayleigh limited l Considerable temperature uncertainty, $ 1 K at room temperature (Rodrigues et al., 2016) l Strong dependence on the relative orientation between the camera and the measured surface (Benayas et al., 2015) l Maximum acquisition rate around 5 kHz, corresponding to a temporal resolution of 0.2 ms l Covering layers for emissivity correction can distort the thermal field and may be incompatible with the inspected sample (Milla ́n et al., 2014) Continued

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