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

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Munitions Management (MM) Poster Number 51 – Wednesday Ground Based Detection and Discrimination — EMI & Magnetometers / Sensors METALMAPPER: A MULTI-SENSOR TEM AND MAGNETIC GRADIOMETER T SYSTEM FOR UXO DETECTION AND CLASSIFICATION DR. MARK PROUTY Geometrics 2190 Fortune Drive San Jose, CA 95131 (408) 428-4212 markp@mail.geometrics.com CO-PERFORMERS: Dr. D.D. “Skip” Snyder (Snyder Geoscience); Dave George (G&G Sciences) he objective of this project is to commercialize advanced technology emerging from recent ESTCP, SERDP, and NAVEODTECHDIV funded EM research. The project draws heavily from AOL (Advanced Ordnance Locator) technology developed by G&G Sciences with funding from NAVEODTECHDIV. We use target parameter extraction software developed by Lawrence Berkeley National Laboratory under the BUD (Berkeley UXO Discriminator – MM-0437) project. With this technology, we have assembled and demonstrated a field prototype of advanced electromagnetic induction (EMI) instrument for detection and characterization of UXO that performs substantially better than existing commercially available instruments. The instrument includes, as an option, the ability to simultaneously acquire both EMI and magnetic gradient data (Dual Mode Acquisition). The project was funded late in FY06. During the past year, we completed the development and assembly of a field prototype hardware system together with Windows-based data acquisition and interpretation software to support it. Our interpretation software (MM/RMP) is based on a robust algorithm for UXO model parameterization developed by T. Smith at LBL. The prototype MetalMapper system has completed a short “shake-down” demonstration at the Standardized UXO Technology Demonstration Site at Yuma Proving Grounds (YPG) in June 2008 and a more comprehensive demonstration at the test site in Aberdeen Proving Grounds (APG) that was completed in October 2008. This paper describes the prototype MetalMapper system and presents data acquired during the demonstrations at YPG and APG. This project has been funded under ESTCP MM-0603. G-19
Munitions Management (MM) Poster Number 52 – Wednesday Ground Based Detection and Discrimination — EMI & Magnetometers / Sensors MINIATURE TOTAL FIELD MAGNETOMETERS DR. MARK PROUTY Geometrics 2190 Fortune Drive San Jose, CA 95131 (408) 428-4212 markp@mail.geometrics.com CO-PERFORMERS: Dr. John Kitching (NIST); Dr. Darwin Serkland (Sandia National Labs) M agnetometers are one of the basic instruments used for the detection and discrimination of unexploded ordnance (UXO). Cesium vapor atomic magnetometers are commonly used since their readings are independent of the orientation of the sensor, which eliminates the noise problems due to rotation or even vibration of other types of sensors. In order to better discriminate UXO from clutter or scrap, a high spatial density of readings is desirable. In order to efficiently make such measurements, and to position such measurements accurately, arrays of sensing elements would be highly desirable. However, existing cesium vapor sensors are extremely large and consume a lot of power. Under two SERDP funded projects Geometrics, along with partners at the National Institute for Standards and Technology (NIST) and Sandia National Laboratories, have developed a miniature total field sensor, consuming a small fraction of the power of existing commercial sensors. Such sensors are well on their way towards commercialization. In continuing work, we are extending those techniques by pursuing methods of operating at wide bandwidths. Such sensors could replace inductive coils currently used in EM devices for UXO detection and discrimination. In addition to their small size, measuring the magnetic field instead of its rates of change, as an inductive coil does, has considerable advantages. In this poster, we will present extremely exciting results of our work prototyping and testing actual atomic magnetometers with components no larger than a grain of rice. Measured performance of better than 10 pT per root Hz under actual field conditions will be shown. Power consumption is a small fraction (less than 10%) of that used in existing systems. We will also show results of our work at different cell temperatures, measuring the feasibility of working at higher bandwidths. This work will extend the MEMS technologies, allowing for a single sensor capable of making both a DC magnetic field measurement as well as a high frequency measurement for use in a time domain EM system. Significantly progress is also being made towards commercializing these devices. Our design requires straightforward MEMs techniques, which are much less complicated, in fact, than some devices in commercial production today. Geometrics is working with commercial partners to begin producing such devices in the near future. This project has been supported under SERDP MM-1512. G-20
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