aller than seven to eight times the diameter of thesource should not be used on account of stray reflection andradiation from the walls of the pyrometer tube. Even after impos-ing this limitation upon the use of this pyrometer, the instrumentfor the highest accuracy should not be used with sources… … *60 0 25 50 75 ca - distance from eoarce to front diaphraga of pyrometer Fig. 29.—Emf as a function of tlie sighting distance. Thwing pyrometers dimensions (measuring from the wing nut) increases as the sourceis brought nearer the front opening of the pyrometer. In general, therefore, it may be…
Thermometry, pyrometry and calorimetry · Heat flow, thermal and thermodynamic processes
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