Accession Number : AD0674163

Title :   HIGH-SPEED SPARK PHOTOGRAPHY WITH A RATE UP TO 40,000 FRAMES PER SECOND (SKOROSTNAYA ISKROVAYA FOTOGRAFIYA S CHASTOTOI DO 40 000 KADR./SEK),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Berezkin,A. N. ; Berezkina,M. K.

Report Date : 09 JAN 1968

Pagination or Media Count : 11

Abstract : A method for high-speed spark photography is described. The equipment used is capable of producing sparks in a single discharge interval as well as in intervals whose repetition rate is easily found and regulated. The equipment can operate at speeds of 5000 to 40,000 frames/sec, and the usual number of frames exposed at a time is five. The repetition frequency band can easily be widened in both directions. The total number of frames can also be increased by adding more identical units to the equipment. The electronic part of the equipment, which generates sparks at precise intervals, is a multichannel electronic synchronizer which consists of a control circuit and a circuit that generates high-voltage pulses. Electron tubes are used in both circuits. The optical part of the equipment consists of two optical circuits: a circuit for sparks that occur at varying time intervals and a circuit for sparks that occur in a single discharge interval. The equipment was used to photograph non-stationary processes of interaction between a shock wave and objects in shock tubes or on ballistic polygons. (Author)

Descriptors :   (*SPARK SHADOWGRAPH PHOTOGRAPHY, *FLOW VISUALIZATION), SHOCK WAVES, INTERACTIONS, BALLISTICS, CIRCUITS, USSR

Subject Categories : Aerodynamics
      Photography
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE