APPLICATION OF AN ELECTROMAGNETIC DIAGNOSTIC TECHNIQUE FOR IN-FLIGHT SHAPED CHARGE JET AND HYPERVELOCITY PARTICLE CHARACTERIZATION

摘要

An electromagnetic measurement technique is used to augment the characterization andunderstanding of hypervelocity projectiles before impact. The paper includes a shortdescription of the method, while focusing on its recent utilization for jet particles and gunlaunchedhypervelocity projectiles. Data from the applied electromagnetic diffusiontechnique allowed both size and velocity characterization of particles from 0.5 mm up to 5mm in diameter with velocities ranging from (but not limited to) 1000 m/s to 4000 m/s. Thisincludes a series of experimental tests for method validation and calibration using light gasgun propelled laboratory projectiles as well as characterization of particles from a RISITeledyne model RP-4SC small commercially available shaped charge. Techniques fornarrowing the detection signal such as electromagnetic shielding and differential sensingenable measurements of multiple particles with separations on the order of 20 mm. Thus,we show that the presented method has potential to enhance ballistic studies by providing anadditional technique to expand current hypervelocity projectile diagnostics, increasingcapabilities in the area of in-flight characterization of projectiles before and during impactfor dynamic material and validation studies.Part of the presentation given in the present paper is taken from a recent publication by thesame authors [J. Appl. Phys. 118, 184901 (2015)].