Rapatronica

rapatronic

During the early days of atomic bomb experiments in the 1940s, nuclear weapons scientists had some difficulty studying the growth of nuclear fireballs in test detonations. These fireballs expanded so rapidly that even the best cameras of that time were unable to capture anything more than a blurry, over-exposed frame for the first several seconds of the explosion.

Before long a professor of electrical engineering from MIT named Harold Eugene “Doc” Edgerton invented the rapatronic camera, a device capable of capturing images from the fleeting instant directly following a nuclear explosion. These single-use cameras were able to snap a photo one ten-millionth of a second after detonation from about seven miles away, with an exposure time of as little as ten nanoseconds. At that instant, a typical fireball had already reached about 100 feet in diameter, with temperatures three times hotter than the surface of the sun.

Edgerton was a pioneer in high-speed photography, receiving a bronze medal from the Royal Photographic Society in 1934 for his work in strobe photography. He used the technique to photograph many events that typical cameras were much too slow to capture, such as the instant of a balloon bursting, and bullets impacting various materials. He developed the rapatronic camera about ten years later, for the specific purpose of photographing nuclear explosions for the government.

n a typical setup at a nuclear test site, a series of ten or so rapatronic cameras were necessary, because each was able to take only one photograph… no mechanical film advance system was anywhere neat fast enough to allow for a second photo. Another mechanical limitation which had to be overcome was the shutter mechanism. Mechanical shutters were incapable of moving quickly enough to capture the instant one ten-millionth of a second after detonation, so Edgerton’s ingenious cameras used a unique non-mechanical shutter which utilized the polarization of light.

From Damn Interesting.com

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