We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Photographic Instrumentation in the Study of Explosive Reactions
By MORTON SULTANOFF
A brief description of explosive reactions is presented to acquaint the reader with the problems which arise in the study of explosions by photographic techniques. Optical and electronic equipment, designed to produce exposure times approaching 10"9 sec, is discussed from the standpoint of light-gathering power, exposure time and cost. Three basic types of cameras (streak, single short-duration exposure, and very-high-speed motion picture) are described, and examples of typical photographs are presented.
JL HE APPLICATION of photography to the study of explosive reactions is a natural consequence of the high luminosity which accompanies these reactions. Three problems of paramount importance, with which most other photographic studies are not concerned, dictate the techniques, equipment, and materials employed in the photographic studies of explosions.
First, protection from the blast and flying fragments and debris must be afforded for both the equipment and personnel. Great distances can be used to separate the explosion safely from the recording equipment. However, all the work described in this paper was accomplished in a blast chamber built directly into an optical laboratory, and
Presented on October 8, 1952, at the Society's Convention at Washington, D.G., by Morton Sultanoff, Ballistic Research Laboratories, Terminal Ballistics Lab., Aberdeen Proving Ground, Md.
so disposed as to afford adequate protection from explosive charges as large as 8 Ib at distances as close as 3 ft.
The very high speeds of the events which accompany explosive reactions make it essential that the exposure times of any photographic recordings do not exceed 1/1,000,000 of a second, a unit of time which is generally called a microsecond. To date, the problem of short exposure times has been solved only by making necessary compromises as described in later parts of this paper.
Even after the first two problems have been solved and successful photographs of explosions have been obtained, the researcher in this field is faced with the task of interpreting the photograph. Although much has been learned about the identity of the luminosity by past investigators,1 there is still uncertainty as to the source of radiation in the photographically recorded spectrum in many phases of the explosion.
February 1953 Journal of the SMPTE VoL 60
145