Temperature Measurements In The System Test 

 					By C.J.Liaw  					8/7/98

 	The attached nine figures show the equipment and the temperature measurements in the SVT system test.  The measurement results included the calibrations of the IR sensor (used to perform the measurements), the temperatures on the detectors verse air flow rates and water flow rates, the temperature gradients across the detectors verse air flow rates and water flow rates, and the maximum temperatures on the PASA verse water flow rates. The IR sensor(a K type thermocouple), which was calibrated with the same test setup as shown, was located about 5 mm above the detector or the PASA during the measurements.  There were nine equally spaced measurement locations on each detector (one at the center, four at the corners and four at the center of the sides). The temperature gradient of each detector was the difference between the maximum and the minimum temperature of the nine points.  The measurement location on the PASA was at the middle of the hybrid.   

 	The results showed that 

1. The accuracy of the IR sensor could be within +/- 0.1 oC. 
   
2. The detector temperatures, at the designed air and water flow rates, were between 21.8 to 22.5 oC with the maximum occurred at the border of #2 and #3 detectors (as expected). 

3. The temperature gradients varied between 0.28 to 0.58 oC (the ANSYS prediction was 0.4 oC). 

4. The maximum temperature on the PASA varied from 25 oC to 26.3 oC (compreaed to 25.6 oC from ANSYS).