Kocher, D. G.

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XXIV. STROBOSCOPIC RESEARCHProf. H. E. EdgertonD. G. KocherJ. A. McMorris IIA. MULTIPLE-SPARK LIGHT SOURCE AND CAMERA FOR SCHLIERENAND SILHOUETTE PHOTOGRAPHYThis report summarizes a paper that is to be presented at the Eighth Annual Tech-nical Symposium of the Society of Photographic Instrumentation Engineers to be heldin Los Angeles, California, August 6, 1963.A multiple-spark light source and camera have been devised by utilizing the Cranz-Schardin optical method for schlieren and silhouette photography. Each light source isa spark in air, with an effective duration of 10 - 7 second and a peak light of 24, 000 candle-5power. The interval between successive sparks is independently adjustable from 10-5 to10 - 7 sec, thereby permitting a variable picture rate to be used in a single sequence ofphotographs.The equipment contains 10 spark light sources and camera lenses; thus a 10-picturesequence of high-speed phenomena is obtained. Schlieren and silhouette photographsdemonstrating the performance of the equipment will be presented at the meeting.A more complete report on this work will appear in our next quarterly report.D. G. KocherQPR No. 70 369

Stroboscopic Reasearch

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Stroboscopic Reasearch

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