17 May 2006 Comparison of two new portable magnetic susceptibility measurement systems
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Abstract
Magnetic soils confound both magnetometers and electromagnetic induction (EMI) sensors when these sensors are being used to detect landmines and unexploded ordnance (UXO). The amplitude of the magnetic susceptibility of the target is the problematic physical characteristic for magnetic detection; whereas the variation of magnetic susceptibility as a function of frequency, or magnetic viscosity, is the problematic physical characteristic that limits EMI sensor's effectiveness for target detection. Quantifying the physical characteristics of the soils in which targets are located can potentially provide insight into new methods of detection. Two new production sensors, which measure magnetic susceptibility as a function of frequency, have been tested on paramagnetic salts and soil samples from sites that exhibit magnetic viscosity. The purpose was to document their response for comparison with other popular sensors such as the Bartington MS2 system or the Quantum Designs MPMS. One of the new sensors, the SM-100 sensor from ZH Instruments, measures magnetic susceptibility at five fixed frequencies (~400Hz - 8 kHz) and six field strengths (10-320 A/m). The MAGNASAT sensor, a recently developed tool from Queensland Magnetic Research, can measure over a wider frequency band (10 Hz to 100 kHz) at a single field strength (80 A/m). The MAGNASAT measures the both the real and complex components of the magnetic susceptibility, whereas the SM-100 only measures the real component. Both sensors are sensitive enough to measure diamagnetic materials such as water, however, which is useful in field settings.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ryan E. North, Ryan E. North, } "Comparison of two new portable magnetic susceptibility measurement systems", Proc. SPIE 6217, Detection and Remediation Technologies for Mines and Minelike Targets XI, 62170U (17 May 2006); doi: 10.1117/12.666426; https://doi.org/10.1117/12.666426
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