Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
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Combustion study <strong>of</strong> twin, oscil<br />
lating gas flames using schlieren<br />
technique and stroboscopic light.<br />
Reflector <strong>of</strong> Strobotac was re<br />
moved so that the flash lamp<br />
arc would approximate a point<br />
source <strong>of</strong> light. The parallel light<br />
rays produced by the schlieren<br />
technique refract differently as<br />
they pass through different re<br />
gions <strong>of</strong> the flame having dif<br />
ferent density gradients, thus<br />
producing light and dark areas<br />
in the photograph. Rate <strong>of</strong> flame<br />
pulsation was twelve cycles per<br />
second; rale <strong>of</strong> stroboscopic<br />
flashing was 200 per second. The<br />
succession <strong>of</strong> single images<br />
shown in the photograph at<br />
left was taken with a streak<br />
camera at constant film speed.<br />
Courtesy <strong>of</strong> Mr. ion Kelly, M.I.J.<br />
Engine Laboratory.<br />
An 8-inch circular-saw blade<br />
rotating at 3450 rpm. Left<br />
side <strong>of</strong> blade appears<br />
blurred due lo exposure un<br />
der steady light directed<br />
only at that side, while<br />
right side appears station<br />
ary, with minute surface<br />
scratches clearly defined,<br />
under Ihe 0.8-microsecond<br />
flash <strong>of</strong> the Strobotac.<br />
72
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