SURFACE TEMPERATURES 



Surface-film temperature in a 

 slick has been successfully determined 

 by an infrared sensor at the tower. The 

 sensing equipment consists of an infrared 

 temperature detector, signal-processing 

 electronics, and strip-chart recorder. 

 This noncontact instrument remotely 

 senses radiation in a spectral region (8 

 to 13 microns) where water is highly 

 emissive but is not reflective. The in- 

 vestigation showed that it is possible to 

 establish water structures and processes 

 in the sea from continuous surface- 

 temperature recordings with an infrared 

 radiometer. 



Surface temperatures from the 

 tower are also measured by the bucket- 

 thermometer and other sensors. 



The infrared detector consists of an optical system 

 and thermistor bolometer located 20 feet above the 

 mean tide level. The beam, which is 5 degrees wide, 

 senses 2.4 square feet of the sea surface. 



Temperature measurements by the detector ar 

 processed by electronic circuitry, amplified, the 

 fed to the strip chart recorder in the instrumei 

 house. 



42 



