Heat and Thermodynamics

12.20 Experimental Determination of Stefan's Constant

The principle of the method is as follows: The instrument consists of three essential parts (Fig. 12.13):

1. A source of radiation (a black body) (FG).
2. A screen with a shutter (CD).
3. A receiver (AB).

 

 

Fig. 12.13 Apparatus′ arrangement for determination of stefan′s constant

 

The first important adjustment is that the centres of the receiver, the shutter and the radiator must lie in the same straight line. The second adjustment is that the surfaces of the receiver, the shutter and the radiator must be perpendicular to the central line. The third important adjustment in setting of the instrument ...