Magnetometer - Gradiometer trials

We had some trials to test a newly developed gradiometer and our A/D hardware and latest software. The results were very good. We used a special 'software controlled', 'in-house', pseudo 16 bit AD convertor with a minimum resolution of a mere 100 microVolt and automatic OFFSET control. Although in this case we only used one gradiometer we could with the present hardware, accommodate a total of eight simultaneously. The maximum sampling rate per second, including screen-updates, storing of data, reading position data, scanning the keyboard for various instructions, etc, an astonishing:

2150 samples per second

This of course, at lower speeds, is too much, but at higher speeds, for example a survey from an helicopter, travelling at 200 knots or 100 meters per second, it implies that vast areas can be covered in a short time. At lower speeds it means that more 'processiong-time' remains to do:

• online predictions of depth of burial
• online processing of the data
• online replay of data
• etc

We were able to find back minute bits of metal buried 0 - 1 meter at a water depth of 3 - 7 meter and could verify it instantly using a sediment echosounder

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