Handbook of High Speed Photography - IET Labs, Inc.

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Study of effect of strong transverse electric fields on falling liquid drops, as might occur in rain clouds. Multiple-flash photographs were taken at a Strobotac flashing rate of 700 flashes per minule while a drop of milk fell between two metal plates charged lo create a field strength of 10 kv/cm. The drop stretches out as it falls until a discharging spark occurs, after which surface tension pulls it together again. Royal X 4 x 5 sheet film developed in D76. Courtesy of David C. Eldridge, Edward M. Skinner, and James fsepas, Andover High School, Massachusetts. Shadowgraphs of a bullet passing through a soap bubble filled with Freon-12. A Strobotac was used as a point source by removal of Ihe refleclor and orienlalion of the flash lamp so lhal the arc of Ihe flash was in line with the direction of Ihe subject and about three yards distant. Instead of a camera, a Poloroid 4 x 5 film back with Polaroid 3000 film was placed 3}/i from Ihe bubble on the opposite side from the light source. The flash was triggered by means of a microphone. Photograph below shows bullet entering bubble and the intensification of Ihe shock wave in the Freon-12. Photograph at bottom shows another bullet leaving a bubble, with strong turbulence in ils wake. Courtesy of David C. Eldridge, Edward M. Skinner, and James Tsepas, Andover High School, Massachusetts. 75
Spray pattern of diesel fuelinjection nozzle. With suitable photographic tech nique and large-scale pho tographs, such pictures can be used in estimating drop let size and size distribution. How to toke a "high-speed movie" with a still camera. The sequency of photographs shows a cam and misbehaving follower. The cam is rotating at 3000 rpm. The photos were taken with a Strobotac, Flash-Delay Unit, and Photoelectric Pickoff. Positioning of the cam was ccomplished with the Flash Delay be advancing the time delay control to a new position for ach photo. Exposure was at f/22 using Polaroid Type 57 (3000 ASA) sheet film. 76
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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
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2.3 FLASH INTENSITY VERSUS DURATION
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..«""*&&. 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
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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 and 78: Combustion study of twin, oscil lat
Page 79: Ropidly moving bubbles of hu man bl
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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