Accession Number:

ADA509654

Title:

Soil Electromagnetic Properties and Metal Detector Performance: Theory and Measurement

Descriptive Note:

Contract rept.

Corporate Author:

TERRASCAN GEOPHYSICS VANCOUVER (BRITISH COLUMBIA)

Personal Author(s):

• Cross, Guy

Report Date:

2008-11-17

Pagination or Media Count:

180.0

Abstract:

Metal detectors are unquestionably the workhorses of humanitarian demining. Although hybrid dual-sensor systems incorporating a ground penetrating radar GPR have recently been introduced and are gaining acceptance, a standard electromagnetic induction EMI sensor remains the primary mode of detection. Despite ongoing evolution and refinement of metal detector technology, however, the practical performance of both continuous wave FDEM and pulse induction TDEM systems continues to be restricted by so-called soil noise effects. Generally, problem or difficult soils reduce signal to noise ratio and increase the false-detection rate. At certain locations, the soil effect is so severe as to render a given metal detector practically inoperable.

Descriptors:

• *METAL DETECTORS
• *ELECTROMAGNETIC PROPERTIES
• *SOILS
• GROUND PENETRATING RADAR
• ELECTROMAGNETIC INDUCTION
• CANADA
• SIGNAL TO NOISE RATIO
• PERFORMANCE(ENGINEERING)
• CONTINUOUS WAVES

Subject Categories:

• Soil Mechanics
• Magnetic and Electric Field Detection and Detectors
• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE