Wednesday (Group 2) - SERDP-ESTCP - Strategic Environmental ...

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Munitions Management (MM) Poster Number 68 – Wednesday Ground Based Detection and Discrimination — EMI & Magnetometers / Sensors MAGNETIC SENSORS WITH PICOTESLA MAGNETIC FIELD SENSITIVITY AT ROOM TEMPERATURE SY-HWANG LIOU University of Nebraska Department of Physics and Astronomy and Nebraska Center for Materials and Nanosciences 364 Behlen Lincoln, NE 68588-0111 (402) 472-2405 sliou@unl.edu CO-PERFORMERS: Stephen E. Russek, L. Yuan, Sean T. Halloran, F. C. S. Da Silva, John Moreland, and David P. Pappas (National Institute of Standards and Technology, Boulder, CO) W e present a design of a low power, compact, magnetoresistive sensor. The key features of the design are (1) decreasing the noise by the use of a 64 element bridge, (2) reducing the magnetic noise by annealing of MTJ in high magnetic field and a hydrogen environment, and (3) increasing signal by the use of external low-noise magnetic flux concentrators. The field noise of our prototype magnetic sensor are approximately 1 pT/Hz 1/2 at 1 kHz, 5 pT/Hz 1/2 at 10 Hz, and 50 pT/Hz 1/2 at 1 Hz at room temperature. The magnetic sensor only dissipates 15 mW of power while operating. This project has been supported under MM-1569. G-23
Munitions Management (MM) Poster Number 69 – Wednesday Ground Based Detection and Discrimination — EMI & Magnetometers / Sensors CHARACTERIZATION OF MUNITIONS USING EMI WITH AN ARRAY OF 3-COMPONENT B-FIELD SENSORS (BEAMOD) W DR. MICHAEL ASTEN Flagstaff GeoConsultants Technology Pty Ltd 337A Lennox Street, Suite 2 P.O. Box 2236 Richmond South, Victoria 3121 AUSTRALIA +61 3 8420 6240 michaelasten@flagstaff-geoconsultants.com.au CO-PERFORMERS: Duncan, Sam Fogarty, and Gary Hooper (Flagstaff GeoConsultants Technology Pty Ltd); Dr. Stephen Billings, Dr. Len Pasion, and Dr. Dave Sinex (Sky Research, Inc.) e have developed an operational prototype of an EMI system for UXO detection using a single transmitter coil of moment 180 A.m 2 , and three 3-component fluxgate sensors (B-field Electromagnetic Array for Munitions and Ordnance Detection – BEAMOD). We have trialed three software tools for extracting maximum target information from the instrument bandwidth and configuration. 1. Transformation of gridded images of z-component response to the principal components of 25-channel data, yields images which show first-pass discrimination between UXO type, independent of depth of burial on a seeded test range. The discrimination is superior to that attainable from time-constant calculations on noisy moving-platform data. 2. BEAMOD profiles across buried munitions with and without a pseudo-random surface distribution of scrap metal show that the second derivative of the horizontal transverse component of the EMI field is a powerful discriminator of scrap versus buried-target responses. 3. After extension of the UXOLAB software package to utilize an array of vector sensors. The BEAMOD profiles across buried munitions invert to yield dipole parameters of three orthogonal dipoles. Parameter variance decreases as the multiple receivers and multiple components are added to the basic single-component profiles, verifying self-consistency between the multiple sensors and components, and demonstrating that higher resolution is attainable when using the array of sensors. The standard deviation on recovered polarizations when using the array of vector sensors is typically a factor of five reduced from that obtained when using profiles acquired with a single vertical-component sensor only. The project has been supported by SERDP as Project MM-1598. G-24
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