Accession Number : AD0849261

Title :   An Electromagnetic Technique for Measuring Particle Velocity in Shock Waves.

Descriptive Note : Technical rept.,

Corporate Author : ROHM AND HAAS CO HUNTSVILLE AL REDSTONE RESEARCH LABS

Personal Author(s) : Johnson, Edgar G.

Report Date : FEB 1969

Pagination or Media Count : 33

Abstract : An electromagnetic technique is described for measuring the particle velocity as a function of time in a solid sample being traversed by a shock wave. The technique monitors the voltage generated by the motion of a conductor, embedded in the sample, in the presence of a magnetic field. A properly constructed conductor will move with the particle velocity generated by a shock wave in a solid. The technique was used to measure the particle velocity in Plexiglas due to strong shock waves generated by an explosive in contact with the Plexiglas. These particle velocity measurements and shock velocity measurements made by microwave interferometry are compared with published results from smear camera records for shock pressures in the range of 20 to 80 kbar. The technique was also used to measure particle velocity from shock waves of very low pressure (less than 1 kbar). The low-pressure shock waves were generated in Plexiglas samples by shock waves in air. A shock tube that transmits the blast wave from an explosive charge to a sample is described. (Author)

Descriptors :   (*PARTICLES, VELOCITY), (*SHOCK WAVES, MONITORS), ACRYLIC RESINS, ELECTROMAGNETIC RADIATION, MEASUREMENT, TIME, VOLTAGE, LOW PRESSURE, SHOCK TUBES, EXPLOSIVES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE