UXO Engineering Design. Technical Specification and ConceptualDesign

Beche, J-F. ; Doolittle, L. ; Greer, J. ; Lafever, R. ; Radding, Z. ; Ratti, A. ; Yaver, H. ; Zimmermann, S.

Lawrence Berkeley National Laboratory

关键词: Calibration;    Amplitudes;    Classification;    Wave Forms;    Specifications;   

DOI  :  10.2172/877337
RP-ID  :  LBNL--59113
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  877337

美国|英语

来源: UNT Digital Library

【 摘 要 】

The design and fabrication of the UXO detector has numerous challenges and is an important component to the success of this study. This section describes the overall engineering approach, as well as some of the technical details that brought us to the present design. In general, an array of sensor coils is measuring the signal generated by the UXO object in response to a stimulation provided by the driver coil. The information related to the location, shape and properties of the object is derived from the analysis of the measured data. Each sensor coil is instrumented with a waveform digitizer operating at a nominal digitization rate of 100 kSamples per second. The sensor coils record both the large transient pulse of the driver coil and the UXO object response pulse. The latter is smaller in amplitude and must be extracted from the large transient signal. The resolution required is 16 bits over a dynamic range of at least 140 dB. The useful signal bandwidth of the application extends from DC to 40 kHz. The low distortion of each component is crucial in order to maintain an excellent linearity over the full dynamic range and to minimize the calibration procedure. The electronics must be made as compact as possible so that the response of its metallic parts has a minimum signature response. Also because of a field system portability requirement, the power consumption of the instrument must be kept as low as possible. The theory and results of numerical and experimental studies that led to the proof-of-principle multitransmitter-multireceiver Active ElectroMagnetic (AEM) system, that can not only accurately detect but also characterize and discriminate UXO targets, are summarized in LBNL report-53962: ''Detection and Classification of Buried Metallic Objects, UX-1225''.