Title :
Wide bandwidth time-domain electromagnetic sensor for metal target classification
Author :
Nelson, Carl V. ; Cooperman, Charles B. ; Schneider, Wolfger ; Wenstrand, Douglas S. ; Smith, Dexter G.
Author_Institution :
Appl. Phys. Lab., Johns Hopkins Univ., Laurel, MD, USA
fDate :
6/1/2001 12:00:00 AM
Abstract :
A portable, wide bandwidth, time-domain electromagnetic sensor system has been developed and used extensively to measure the eddy current time-decay response of a wide variety of metal targets. The sensor has demonstrated the ability to measure metal target decay times starting approximately 3 to 5 μs after the transmitter current is turned off and target decay time constants as short as 1.4 μs. The sensor has demonstrated the potential for detecting very low-metal content mines due to the void they create in some types of electrically lossy soils. The development of the sensor is described in detail, and time-decay data are shown for a variety of metal targets, including low metal antitank and antipersonnel mines
Keywords :
buried object detection; electric sensing devices; electromagnetic induction; military equipment; time-domain analysis; weapons; decay times; eddy current time-decay response; electrically lossy soils; low metal antipersonnel mines; low metal antitank mines; metal target classification; portable wide bandwidth time-domain electromagnetic sensor system; very low-metal content mines; wide bandwidth time-domain electromagnetic sensor; Bandwidth; Current measurement; Eddy currents; Electromagnetic measurements; Sensor phenomena and characterization; Sensor systems; Soil; Time domain analysis; Time measurement; Transmitters;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
