Handheld Broadband Electromagnetic UXO Sensor
Abstract
The broadband electromagnetic sensor improvement and demonstration undertaken in this project took the prototype GEM-3 and evolved it into an operational sensor with increased bandwidth and dynamic range, and enough memory and processing power to allow efficient data acquisition while decreasing the weight for ease of operation. In addition to the original hand-held configuration specified at the outset, a cart-mounted large-coil configuration has also been developed for surveying large open areas. Specifically, the frequency range was doubled from 24 kHz to 48 kHz, 24-bit ADC replaced the 16-bit ADC providing 48 dB increased dynamic range, digital signal processor fast enough to allow continuous operation at more than 10 frequencies simultaneously, and compact-flash memory accommodating internal storage of a days surveying. Other new capabilities include real-time output of data for logging into a portable computer (either laptop or palm) as an option to internal storage. Seamless integration with GPS provides geo-referenced data in UTM grid coordinates. Utility software for both the laptop and the palm computers provide an advanced user interface for configuring and controlling the GEM as well as real-time data display and processing. Mechanical construction was refined as well.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 08, 2005
- Accession Number
- ADA447211
Entities
People
- Anne M. Andrews
- George Robitaille
- I. J. Won
- Jeffrey Fairbanks
- Jeffrey Marqusee
- Larry Overbay
- William A. San Filipo