Abstract

This paper proposes a method for measuring the temperature of a closed volume of the type of a blackbody cavity from the total absorption of resonance multiplets of isolated atoms. It is shown that the absolute thermodynamic temperature can be measured by measuring the ratio of the total absorption of a pair of lines with a common upper level. The method is verified by measuring the total absorption of the 2P^0_1/2,3/2 - 2S_1/2 resonance doublets of indium and gallium. The metals are placed in an absolute cell heated to 1000 K. The temperature is monitored by a standard platinum-platinum/rhodium thermocouple. Good agreement is obtained between the results of the thermocouple readings and the result of the photometric measurements by the proposed method. It is demonstrated that a photometric reference temperature point can be created - a temperature at which the total absorption of the components of the resonance doublets of the atoms are identical. The thermodynamic temperature is determined in this case by the energy splitting of the sublevels of the ground state of the atom, which is known with high accuracy. © 2004 Optical Society of America

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