Procedure for Surveying a Station in the U.S. Army Research Laboratory Transonic Experimental Facility Spark Shadowgraph Range

Report No. ARL-TN-614
Authors: John J. Heath
Date/Pages: June 2014; 28 pages
Abstract: The indoor instrumented spark range at the U.S. Army Research Laboratory Transonic Experimental Facility was designed for firing various-caliber projectiles to establish their free-flight characteristics. The in-flight position and orientation of the projectile is measured using 25 orthogonal pairs of spark photography stations, providing a set of shadowgraphs. An intrinsic part of the spark range instrumentation is the complex fiducial system that resides within the facility. This report presents the step-by-step method used to survey one of the 25 orthogonal fiducial stations using specialized equipment and techniques. Such a survey may be conducted to measure and record the position of an existing fiducial bead, reattach a bead to an existing fiducial wire, or be part of a larger effort to replace a broken or damaged fiducial wire or other system component.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2014