6-8] 



INFRARED SYSTEMS 



341 



,**''^ 



Fig. 6-34 Example of an IR Scan Pattern. 



The detector receives the radiation collected by the optical system and 

 converts this to electrical energy, which is amplified and appropriately dis- 

 played — in this case on a cathode-ray screen — or used as an error signal 

 for tracking. There is radiation received from the target, from the clouds, 

 haze, land, water, and sky within the scanned field, and from the atmos- 

 phere lying between the detector and the target. In some instances the 



