Knopow, Joseph J
American engineer, at Lockheed in the 1950s developed the infrared radiometer, used to track and target aircraft and missiles.
Joseph J. Knopow was a young Lockheed engineer who helped develop an infrared radiometer and telescope to detect the hot exhaust gases emitted by long-range jet bombers and, more important, large rockets in the mid-1950s. This aircraft-tracker and missile-detection system became a standard method of targeting enemy air and spacecraft.
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Launius, Roger D, NASA Chief Historian, NASA History Office Home Page, Web Address when accessed: here.
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