HUSSAR SWORD Series. HUSKY PUP Event. Development and Testing of an Earth Displacement Sensor.

摘要

This report describes the effort toward development of an Earth Displacement Sensor (EDS) for direct measurement of earth particle velocity and displacement in an underground test environment. The objective of this development was a sensor capable of direct measurement of earth displacement thereby avoiding errors associated with integration of acceleration or velocity measurements. The EDS consists of an inertially isolated radial field magnet within a long tube which is embedded in the earth. Discrete pickup coils are distributed along the length of the tube. As the tube moves with the earth motion, a signal is induced in the coils moving through the magnetic field. Determination of which coil is producing the signal at any given time yields a direct measurement of the earth position at that time. Additionally, the amplitudes of the signals are proportional to the earth particle velocity. Details of the EDS design and related analysis are described and results of laboratory tests are presented along with field test results from event HUSKY PUP.