PHOTOELECTRIC DETECTORS 



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Q. 



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(0 



$ 



I 



o 



100 

 80 



60 



AO 

 30 



20 



10 

 8 



6 



3 

 2 



1-0 

 08 

 0-6 



0% 

 0-3 



0-2 

 0-1 



500 IpOO 



External resistance 



1.500 



2p00 

 ohms 



Figure 28.39 The energy output of a 45 mm diameter Weston cell for various 

 illumination levels and load resistances 



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 o 



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c 

 o 



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10 



20 

 Temperature 



30 



40 

 °C 



Figure 28.40 Effect of temperature on current output at 20 foot-candles for 

 a 45 mm diam. barrier-layer cell 



371 



