Accession Number : ADA312929

Title :   On the Feasibility of Using Extremely Low Frequency Electromagnetic Fields to Detect Mines in Shallow Water.

Descriptive Note : Final rept. Jan-Dec 93,

Corporate Author : INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA

Personal Author(s) : Balko, Bohdan ; Kay, Irvin

PDF Url : ADA312929

Report Date : JAN 1994

Pagination or Media Count : 30

Abstract : This document considers an approach to mine detection based on electromagnetic detection. It involves the use of a magnetic or electric dipole antenna to transmit a low frequency signal that would illuminate and interact with an object, such as a mine, all dimensions of which are small compared to the wavelength as well as to the distance between the object and the antenna. A dipole antenna, which may be the same as or different from the transmitter, would receive the signal due to the interaction of the illuminated body with the incident electromagnetic field. Past analyses have demonstrated the feasibility, even at fairly long ranges, of using blue-green lasers to detect bodies immersed in pure water. Unfortunately, this detection method fails in turbid water, which is not transparent to the short wavelength laser radiation, and in cases where the mines have become buried. Sonar techniques, while useful in deeper water, also have problems in the shallow water regime because of clutter and reverberations.

Descriptors :   *ELECTROMAGNETIC FIELDS, *MINE DETECTION, *MAGNETIC DETECTION, SIGNAL PROCESSING, ELECTRIC FIELDS, SHALLOW WATER, FEASIBILITY STUDIES, LOW FREQUENCY, DIPOLE ANTENNAS, MINE DETECTORS, UNDERWATER MINES, MAGNETIC DIPOLES, MAGNETIC MOMENTS, ELECTRIC MOMENTS.

Subject Categories : Magnetic & Electric Fld Detection & Detectors
      Underwater Ordnance

Distribution Statement : APPROVED FOR PUBLIC RELEASE