DX200 Magnetometer!
INTRODUCTION
The AQUASCAN DX-200 has been developed as a powerful detection tool for the
diver, providing a solution for a multitude of detection requirements. One
major role is to complement the towed magnetometer where solid evidence from
the surface survey is met with a flat apparent debris free seabed,
investigation by the diver with the DX-200 can readily pinpoint the buried
ferrous anomalies.
The system has a selectable sensitivity which in itself can assist in the
progressive pinpointing of a target, response is indicated by an audible
tone allowing the diver to determine the the closest proximity to a target
by the progressive increase in audible tone.
SYSTEM DESCRIPTION
The DX-200 has been designed to utilise the same housing as the familiar
AQUAPULSE (AQ1B) range of metal detectors. The
system comprises a robust electronic module together with a one metre length
detection probe, a slim Bonephone (or optionally Underwater Headphones) and
a universal mains charger. Connections are made to the control unit with the
same robust underwater Ikelite connectors as the AQ1B range.
The mains charger, Bonephone & Headphones are identical to those supplied
with the AQ1B family, this allows existing AQ1B owners to utilise these
items on a crossover basis. An internal NimH battery pack gives a minimum of
12 hours operation when fully charged and can be readily topped up at any
time without the drawback of “memory” effects.
The system utilises a pair of high sensitivity Fluxgate magnetic sensors
with a 600mm (approx 2ft) spacing, these are built into a robust GRP probe
together with a pre-conditioning combiner circuit. A two metre polyurethane
sheathed cable couples the probe to the control unit via an Ikelite
connector. A Low Medium and High sensitivity mode can be selected, this
allows the system to be progressively de-sensitised as a target is
investigated. The audible output can be preset to be silent or at a low
frequency such that a minor change in pitch can be observed, this is how the
presence of metallic items are determined. The proportional nature of the
audio response allows the object to be accurately pinpointed or tracked as
in the case of a pipe or cable. The nature of a response can also be helpful
in determining the way an object is lying – such as an anchor or cannon.
The DX200 probe is also available with longer cable lengths, up to 30m, for
drop down applications.
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