10.63 In material sciences, measuring temperatures accurately is of great importance. Optical pyrometry is an established method used for measuring temperatures. These pyrometric temperature measurements are affected by selection of operating wavelength and atmospheric conditions. To solve some of the measurement problems, Rohner and Newmann (Transactions of the ASME, 2003) developed a new system based on UV-B (ultraviolet) wavelength range for pyrometry and tested on a blackbody without solar irradiation.

They recorded the percentage of deviation of the UV temperatures from the blackbody temperatures. Two sets of data were collected;

one based on the calibration at 1400°C and the other at 1500°C. The data are listed in table below.

Is the mean percent deviation significantly higher at 1500°C? Use .

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Black Body Temperature (C) 1300 Percentage of Deviation At 1400C At 1500C Calibration Calibration 0.90 1.15 1320 0.80 1.05 1340 0.40 0.65 1360 0.50 0.75 1380 0.30 0.55 1400 0.00 0.30 1420 -0.05 0.25 1440 -0.05 0.20 1460 -0.15 0.15 1480 -0.25 0.05 1500 -0.40 -0.05