Share Email Print
cover

Proceedings Paper

A high power EMI sensor for detecting and classifying small and deep targets
Author(s): F. Shubitidze; B. E. Barrowes; Yinlin Wang; Irma Shamatava; J. B. Sigman; K. O'Neil; Daniel A. Steinhurst
Format Member Price Non-Member Price
PDF $17.00 $21.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Detecting and classifying small (i.e., with calibers ranging from 20 to 60 mm) and deep targets (burial depth more than 11 times targets diameter) is still a challenging problem using current advanced EMI sensors and signal processing approaches. In order to overcome this problem, the standard time-domain NRL TEMTADS 2x2 electromagnetic induction (EMI) instrument is updated. Namely, the NRL TEMTADS 2x2 system’s transmitter electronics is modified to increase transmitter (Tx) currents from 6 Amperes to 14 Amperes. The instrument has a Tx array with four coplanar square coils, together with four tri-axial receivers (Rx) placed at the center of each Tx. Each Rx cube contains three orthogonal coils and thus registers all three vector components of the impinging signals. The Tx coils, with transmitter currents of ~14 A, illuminate a buried target, and the target responses are collected with a 500 kHz sample rate after turn off of the excitation pulse. The system operates in both static (cued) and dynamic modes. For cued mode, the raw decay measurements are grouped into 121 logarithmically-spaced “gates” whose center times range from 25 μs to 24.35 ms with 5% widths. The sensor is placed on a cart which provides a sensor-to-ground offset of 20 cm or less. In this paper, studies for APG Calibration, Blind, and Small Munitions Grids are presented and analyzed. The areas are arranged in grids of test cells and the cell center positions are known. Each target position is flagged with a non-metallic pin flag using cm-level GPS. The sensor is positioned over each target in turn. With the system positioned over the target, each Tx is activated sequentially and during off the Tx current, all four Rx record data. The capabilities of this sensor platform is rigorously investigated for UXO classification at APG blind and small munitions grids.

Paper Details

Date Published: 19 May 2016
PDF: 11 pages
Proc. SPIE 9823, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXI, 982308 (19 May 2016); doi: 10.1117/12.2224407
Show Author Affiliations
F. Shubitidze, Thayer School of Engineering at Dartmouth (United States)
White River Technologies, Inc. (United States)
B. E. Barrowes, Thayer School of Engineering at Dartmouth (United States)
USA ERDC Cold Regions Research and Engineering Lab. (United States)
Yinlin Wang, Thayer School of Engineering at Dartmouth (United States)
Irma Shamatava, White River Technologies, Inc. (United States)
Thayer School of Engineering at Dartmouth (United States)
J. B. Sigman, Thayer School of Engineering at Dartmouth (United States)
K. O'Neil, Thayer School of Engineering at Dartmouth (United States)
Daniel A. Steinhurst, Nova Research, Inc. (United States)


Published in SPIE Proceedings Vol. 9823:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXI
Steven S. Bishop; Jason C. Isaacs, Editor(s)

© SPIE. Terms of Use
Back to Top