Interpretation of borehole magnetometer data for the detection and characterisation of unexploded bombs
In: State-of-the-art UXO detection and characterization, Jg. 61 (2007), Heft 3-4, S. 206-216
academicJournal
- print, 1/4 p
Zugriff:
Unexploded war-time bombs (UXB) can be found at the ground surface or buried at depths of up to 20 m, where surface-based detection methods become ineffective due to signal weakness and interference. A total-field borehole magnetometer can penetrate to such depths and collect relatively quiet data. However, conventional interpretation techniques suffer from the inherent non-uniqueness in the borehole dimension. In this paper, a constrained optimisation method is utilised for the interpretation of total-field borehole magnetometer data for the detection of deeply buried unexploded bombs. The major advantage over conventional techniques comes from the analytically-derived constraints imposed on the parameter vector by excluding non-geosensible results from consideration and hence reducing the non-uniqueness to a minimal level. A depth dependant objective function is defined to minimise the interference and measurement errors. A test site has been developed for evaluation using real world data. The interpretation results demonstrate its superior capability in handling real-world problems with high non-uniqueness. Furthermore, this method provides a way to estimate the moment strength without knowing the exact position. Together with the modelled signature data for different objects, characterisation of a particular bomb is possible from the inversion of a single total-field borehole profile.
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Interpretation of borehole magnetometer data for the detection and characterisation of unexploded bombs
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Autor/in / Beteiligte Person: | ZHANG, Q ; AL-NUAIMY, W ; HUANG, Y |
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Zeitschrift: | State-of-the-art UXO detection and characterization, Jg. 61 (2007), Heft 3-4, S. 206-216 |
Veröffentlichung: | Amsterdam; London; New York, NY: Elsevier, 2007 |
Medientyp: | academicJournal |
Umfang: | print, 1/4 p |
ISSN: | 0926-9851 (print) |
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