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We are developing a sensitive magnetic tensor gradiometer for detection of underwater unexploded ordnance (UXO) using high temperature superconducting quantum interference devices (SQUIDs). In parallel with the instrument development, we are looking at the challenges of making electromagnetic field and gradient measurements in electrically conductive seawater. We have been carrying out a theoretical...
The presence of a highly conductive medium around a measurement capsule influences electromagnetic measurements made in the ocean and fundamentally alters the structure of the magnetic gradient tensor. Additional effects arise if seawater is flowing past the sensor package. This paper presents a quantitative analysis of these effects and describes the corrections that need to be applied to obtain...
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