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Yellow Duckling
Yellow Duckling was an early development of an infrared linescan camera, developed for the detection of submarines during the Cold War. The name is one of the series of British Rainbow Codes.〔
== Origins ==
Infrared detection systems had been considered as far back as the 1930s.〔 During WWII, the Germans were the innovators in this field. Studies of captured FuG.280 Kielgerät from a Ju 88G night fighter showed the use of a lead sulphide (PbS) detector. This was developed by the British at TRE into a lead telluride (PbTe) detector and the use of liquid nitrogen cooling to improve sensitivity and extend the lower range of temperatures it could detect.〔 Kielgerät also demonstrated the use of a rotating 'chopper' mirror and a simple form of boxcar integrator to extract a usable signal from a noisy detector.
These early detectors had no scanning or imaging ability: they detected heat sources at a single spot. To make them militarily useful they were generally mounted as part of a 'track-follow' mount, where the detector head could be kept pointing at the target. This work would give rise to the heat-seeking air-to-air missiles such as the Green Thistle seeker for the de Havilland Blue Jay (later Firestreak) and the improved Violet Banner seeker used on Red Top.〔 Another approach being developed with these detectors was that of a star tracker for missile navigation. The Blue Lagoon seeker was developed as part of the Blue Sapphhire and Orange Tartan trackers for use in the Blue Moon missile. These seekers scanned from side to side and could measure the position of target stars. It was recognised that if the tracker was turned upside down to point downwards, its scanning would build up a heat picture of the ground map.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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