In addition, the experimental justification, for setting blackbody temperatures
, was overlooked.
For each position, the blackbody temperature was varied to obtain different heat-flux levels.
684 m, obtained from a single data point at a blackbody temperature of 2773 K is also included in the Table.
Figure 11 shows the influence of varying the purge-gas flow rate for two operating conditions of the blackbody temperature, 2273 K and 1873 K.
After the blackbody temperature was stabilized at the set value, the radiometer and the heat flux sensor were placed in front of the blackbody exit at stations A, B and C.
Figures 5 shows the measured heat flux levels at different distances d from the blackbody aperture, with increasing blackbody temperature.
The types of variable-temperature blackbodies available in the LLT facility Blackbody Temperature range Type of ([degrees]C) thermometer Water bath 15 to 90 PRT Oil bath 90 to 200 PRT Cs heatpipe 350 to 700 Au/Pt TC Na heatpipe 600 to 950 Au/Pt TC Table 17.
The LBIR calibration facility is cable of measuring blackbody temperatures from 60 K to about 1000 K in a low background 20 K environment (139).