Detection and Discrimination in One-Pass Using the OPTEMA Towed-Array
MR-201225
Demonstration Summary
The One-Pass Time-Domain ElectroMagnetic Induction Array (OPTEMA) has been designed to achieve the dual objectives of detection and discrimination from a single pass of the sensor system. The project team will conduct two demonstrations with the OPTEMA technology, both at sites amenable to survey with vehicular systems. The first demonstration will be conducted and overseen by Sky Research personnel. The second demonstration will be executed jointly with production geophysics staff from CH2M HILL and will evaluate the transition potential of the technology. The specific objectives of this project are to:
- Determine the relative cost and benefits of deploying advanced electromagnetic induction (EMI) sensors in a "one-pass detection and discrimination" mode through the use of the OPTEMA system compared to the two-pass deployment modes utilized by sensors like MetalMapper and TEMTADS.
- Provide OPTEMA data to a wide range of data analysts to test different processing and interpretation methodologies.
- Transition the OPTEMA technology to production geophysical personnel.
Technology Description
The OPTEMA comprises an EMI sensor and the NovAtel SPAN position and orientation sensor mounted on the back of a low to the ground towed-array that has been designed to transmit minimal vibration to the sensor system. The EMI sensor comprises three orthogonal transmitters and ten three-component receiver cubes that are all precisely synchronized to Global Positioning System (GPS) time. A key innovation of the OPTEMA system is the use of three orthogonal transmitters that are turned 45° to the direction of travel. The field directly under each horizontal axis transmitter is at 45° to the direction of travel (under one transmitter it is 45° clockwise, under the other it is 45° anticlockwise). The field away from the edges of the vertical axis transmitter is either vertical or near vertical. By cycling through each of the three transmitters in succession, the OPTEMA system can generate excitation fields in (approximately) three orthogonal directions across the full swath width of the array. This enables accurate recovery of all three components of an object's principal axis polarizabilities: the intrinsic properties of the item that can be used to support discrimination decisions.
Points of Contact
Principal Investigator
Mr. Jonathan S. Miller
Sky Research, Inc.
Phone: 541-552-5160
Fax: 603-643-5161
Document Types
- Fact Sheet - Brief project summary with links to related documents and points of contact.
- Final Report - Comprehensive report for every completed SERDP and ESTCP project that contains all technical results.
- Cost & Performance Report - Overview of ESTCP demonstration activities, results, and conclusions, standardized to facilitate implementation decisions.
- Technical Report - Additional interim reports, laboratory reports, demonstration reports, and technology survey reports.
- Guidance - Instructional information on technical topics such as protocols and user’s guides.
- Workshop Report - Summary of workshop discussion and findings.
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