AT 

 CF). 



-3 



Figure 4. Results of tests with varying angle of view of 

 IRT sensor. See text for details. 



FIELD TESTS 



The first field test was made on February 4, 1964, on a flight off Narragansett Bay 

 by a Coast Guard Albatross used by Sandy Hook Marine Laboratory (Clark and Stone, 1964) 

 with the intention of inter-calibrating our instrument with his. Our instrument was hand- 

 held side by side with Clark's over a period of nearly two hours. The two instruments pro- 

 duced almost similar data except ours showed on degree (F) higher than his. 



The second field test was done on a Cessna off Sandy Hook on February 12th, This 

 test was scheduled to coincide with the course and passage time of the VEMA so that the 

 IRT record might be compared with the record from the ship-borne sensor (thermistor). 

 However, the ship left two hours earlier than the scheduled time and the rendezvous failed. 

 Also, it turned out that the fluctuations in the power source of this kind of plane and the 

 effect of wind on the instrument in such a small plane were so great that the records 

 showed the temperature fluctuating across a rai^e of 10.0° to 15.0°F. when the sensor was 

 exposed to the air. Since the window in such a small plane is small, the effect of radiation 

 from a body of a plane might be serious if we install the sensor inside the window. We 

 should develop some device which may be used in a small plane to shield the effect of both 

 wind and body radiation to the sensor. 



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