![]() When seen from below by a predator, the animal's light helps to match its brightness and colour to the sea surface. The principle of counter-illumination camouflage in squid. The squid varies the intensity of the light according to the brightness of the sea surface far above, providing effective camouflage by lighting out the animal's shadow. The underside is covered with small photophores, organs that produce light. Īn equivalent strategy, known to zoologists as counter-illumination, is used by many marine organisms, notably cephalopods including the midwater squid, Abralia veranyi. The Canadian ideas were adapted by the US Air Force in its Yehudi lights project.įurther information: counter-illumination The firefly squid uses bioluminescence to counter-illuminate its underside to match the brighter sea surface above.ĭiffused lighting camouflage was explored by the Royal Canadian Navy (RCN) and tested at sea on corvettes during World War II, and later in the armed forces of the UK and the US. The concept was never put into production, though the Canadian prototypes did briefly see service. Projectors were mounted on temporary supports attached to the hull and the prototype was developed to include automatic control of brightness using a photocell. The concept behind diffused lighting camouflage was to project light on to the sides of a ship, to make its brightness match its background. ![]() The Royal Navy and the US Navy carried out further equipment development and trials between 19. It attracted interest because it could help to hide ships from submarines in the Battle of the Atlantic, and the research project began early in 1941. The principle was discovered by a Canadian professor, Edmund Godfrey Burr, in 1940. Make brightness of ships match their backgroundsĭiffused lighting camouflage was a form of active camouflage using counter-illumination to enable a ship to match its background, the night sky, that was tested by the Royal Canadian Navy on corvettes during World War II. HMS Largs by night with incomplete diffused lighting set to maximum brightness, 1942
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