Handbook of High Speed Photography - IET Labs, Inc.

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Multiple-flash, stroboscopic photography used to track down the specific sources of noise in a textile loom for the purpose of noise reduction. Photograph above shows the setup with Strobotac, camera, end of loom where shuttle flight terminates, and microphone to pick up noise. Oilier equipment, not shown, includes a dual-beam cathode-ray oscillograph, a photoelectric cell, two pulse generators, and an oscillator. The photoelectric cell detects the approach of the shuttle and triggers the oscillograph sweep and Ihe first pulse generator, which in turn triggers the second pulse generator after a delay long enough lo allow the shuttle nearly to reach its deceleration point. The second pulse generator acts as a "gate" lo allow the oscillator to trigger a burst of about 17 flashes from the Strobotac at a rate of 500 flashes per second. Photographs are taken in a dark room, with Ihe camera shutter controlled manually. Photograph below shows shullle with while flag to mark position. At lower left is a multiple-flash stroboscopic photograph showing Ihe shuttle's while flog as the shullle decelerates. At lower right is a photograph of Ihe oscillograph screen showing, on Ihe upper trace, Ihe timing of the light flashes in relation to the noise level delected by Ihe microphone and shown on Ihe lower trace. Analysis of these photographs allows a definite correlation to be made between decel eration and instantaneous noise level, as a result of which the noise-conlrol engineer can learn where effort lo reduce noise can most effectively be applied. Courtesy of Mr. Allen L. Cudworth, Liberty Mutual Insurance Company. 73
Ropidly moving bubbles of hu man blood (plasma ond red cells) and oxygen in an experi mental apparatus for studying improved methods of blood oxy genation by heart-lung ma chines during open-heart surgery. Photographs such os Ihis allow determination of the bubble sizes, figurations, and number per square inch. Cour tesy of Dr. C. Lloyd Claff, Director of Research, Single Cell Research Foundation, Inc., Ran dolph, Massachusetts. Multiple-flash stroboscopic photographs are an aid in leaching violin technique. The frozen images help to analyze and correct posture, hand attitude, and motor skills such as bowing and fingering. To produce Ihe photograph at Ihe right, a neon bulb was attached lo Ihe bow to show a continuous path as a supplement to the multiple images. Courtesy of Dr. touts C. Trzcinsfci, University of Nebraska. 74
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TABLE OF CONTENTS ACKNOWLEDGEMENT F
Page 5 and 6:
FOREWORD When I first heard about h
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Figure 1-2. A .22-calibre rifle bul
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Figure 1-4. Multiple-flash analysis
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From the measured distance between
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1.3 USING THE STROBOSCOPE WITH MOVI
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TYPE OF APPLICATION REQUIREMENTS Si
Page 17 and 18:
2.3 FLASH INTENSITY VERSUS DURATION
Page 19 and 20:
..«""*&&. 1 A Figure 2-2. Study of
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section 3 GENERAL RADIO STROBOSCOPE
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Figure 3-2. Using the Stroboslave t
Page 25 and 26:
3.2.2 EXTERNAL TRIGGERING. The Stro
Page 27 and 28: The flashing rate of the 1538 Strob
Page 29 and 30: Type 1540-P4 Oscillator/Delay Unit.
Page 31 and 32: 100 — OF In CENT (PERO TENSITY 1
Page 33 and 34: XENON FLASHTUBE (STROBOTAC) 7000 AN
Page 35 and 36: 4.4 GUIDE NUMBER CHART. A guide num
Page 37 and 38: At extremely short camera-subject d
Page 39 and 40: the relative position of these mark
Page 41 and 42: Figure 4-8. Shock-wave photography
Page 43 and 44: 4.8 OPERATION OF CAMERA SHUTTERS AT
Page 45 and 46: The camera should not be loaded wit
Page 47 and 48: 5.2.2 MECHANICAL CONTACTS. Mechanic
Page 49 and 50: 5.2.3 OPTICAL PICKUP. The optical p
Page 51 and 52: chronization. For instance, the mot
Page 53 and 54: mine the proper attachment of the l
Page 55 and 56: must be set to "Bulb", the Strobota
Page 57 and 58: 5.3.2 OTHER SIGNAL PROCESSING DEVIC
Page 59 and 60: applications require the burst to b
Page 61 and 62: made with the same camera without r
Page 63 and 64: section 6 MOTION-PICTURE PHOTOGRAPH
Page 65 and 66: The subject image will appear to mo
Page 67 and 68: Section 6.4. Photo- and reluctance-
Page 69 and 70: BLADE HAS JUST CLEARED WINDOW TO ST
Page 71 and 72: HIGH-SPEED PHOTOGRAPHY has many use
Page 73 and 74: Use of dry-ice pucks on smooth, lev
Page 75 and 76: Spindle on a textile spinning frame
Page 77: Combustion study of twin, oscil lat
Page 81 and 82: Spray pattern of diesel fuelinjecti
Page 83 and 84: \ Multiple-flash of golf ball just
Page 85 and 86: A pulsating, solenoid-actuated wate
Page 87 and 88: Edgerton, Harold E., "Shock-Wave Ph
Page 89 and 90: INDEX Acceleration 5, 79 Accuracy 1
Page 91 and 92: Type1531-AB STROBOTAC* ELECTRONIC S
Page 93 and 94: Type 1538-A STROBOTAC electronic st
Page 95 and 96: Type 1531-P2 FLASH DELAY synchroniz
Page 97: Type 1541 MULTIFLASH GENERATOR a tr
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Handbook of High Speed Photography - IET Labs, Inc.

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