EMI Array for Cued UXO Discrimination
Abstract
The technology focus of this demonstration is a vehicle-towed array of time-domain electromagnetic sensors designed and operated to optimize the classification of buried munitions from ancillary metallic debris and clutter. The demonstrated technology, known as the TEMTADS array, consists of 25 co-located transmit (Tx) and receive (Rx) pairs arranged in a 5x5 fixed grid configuration. The TxRx pairs are separated by 40cm center-to-center, which results in a 2m square array. Transient decay data are collected for each Rx coil with a 500 kHz sample rate until 25ms after turn off of the excitation pulse. The 25 Tx coils are operated individually while recording with all 25 Rx, resulting in 625 spatial measurements. The system is designed to interrogate subsurface sources one at a time sequentially. It collects data while stationary. The raw signature data from the TEMTADS array reflect details of the sensor/target geometry as well as inherent EMI response characteristics of the targets themselves. In order to separate out the intrinsic target response properties from sensor/target geometry effects the measured signature is inverted to estimate principal axis magnetic polarizabilities using a standard induced dipole response model. The TEMTADS array was designed to combine the data quality advantages of a gridded survey with the coverage efficiencies of a vehicular system. The design goal of this system is to collect data equal, if not better, in quality to the best gridded surveys (the relative position and orientation of the sensors being known better than for gridded data) while prosecuting many more targets each field day.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2010
- Accession Number
- ADA529733
Entities
People
- D. A. Keiswetter
- D. A. Steinhurst
- D. C. George
- G. R. Harbaugh
- J. B. Kingdon
- T. Furuya
Organizations
- Environmental Security Technology Certification Program