SeaSPY
Marine Magnetometer
Surveyor’s
best friend
The most reliable magnetometer
you’ll ever meet. Unfailing data,
durable hardware, and an easygoing disposition make SeaSPY
a mag you can count on.
Light to Use
Apart from our Explorer Mini Marine Magnetometer, SeaSPY is
the lightest mag available. All of its accessories, 50m (164ft) of tow cable,
weigh 18kg (40 lbs), making it truly a one man operation.
Sleek Design
SeaSPY’s new sleek design, resists snags and minimizes
impact. The new polyurethane coated tail with molded
fins acts as a bumber, while creating a stable towing
platform.
3W Power Requirement
1 car battery = 150 hours of continuous use.
2 lantern batteries (26Ah) = 104 hours of continuous use.
Integrate With Side Scans, AUVs and ROVs
A single 10m tow cable is terminated with everything you
need. Modifications to your mag or grad are not required.
See our Side Scan Integration brochure for more details.
Save Hours of Frustration
Protecting Your Assests
Overhauser Effect
A quick glance self diagnostic
LED sytem, on our isolation
transceiver, has saved our cus-
tomers hours of frustration.
A green light = all connections are hooked
up properly
A yellow light = a problem with one of
the connections
ReliabilityBetter Data
A red light = a short. Within micro seconds,
the transceiver will safely shut down the
output power
A blue LED flashes with every mag reading
A warning sounds when even a drop of water gets inside the mag, giving the operator
plenty of time retrieve it, and investigate the
cause, before the mag is damaged. For another level of security, should water get into
the mag, the electronics are enclosed in an
o’ring sealed polycarbonate housing.
SeaSPY is a pulsed Overhauser magnetometer that measures the ambient magnetic
field using a specialized branch of nuclear
Magnetic Resonance technology, applied
specifically to hydrogen nuclei.
See our Technical Application Guide for more
information about your technology.
World Wide Operation
with No Restrictions
SeaSPY will collect accurate
data no matter where you are or
in which direction you are sur-
veying. This is not the case with
optically pumped magnetometers which
have dead zones and must be oriented at a
specific angle relative to the earth’s magnetic
field. This issue can be particularly problematic in equatorial regions where you cannot
collect data in every direction.
Eliminate Shifts In Your Data
‘Heading error’ is a noticeable offset in the
magnetometer output caused by changing
the heading of the magnetometer within the
Earth’s magnetic field. Since SeaSPY’s Overhauser technology does not display heading
error, no matter how the sensor is oriented in
the Earth’s magnetic field, successive survey
lines taken in opposite directions will match
up perfectly.
The benefits to the user are:
1. Targets will not be missed because they
fall between mismatched survey lines.
2. A magnetic map of an area will look
the same, regardless of the direction in
which the survey lines were conducted.
Works Instantly On Power-Up
SeaSPY works equally well in
cold, deep waters as tropical waters, starting instantly
on power-up without requir-
ing warm up. Data collected at –40°C will
be identical to data recorded at +60°C.
Maintenance Free Sensors
SeaSPY sensors don’t degrade with time, so you’ll get
the same quality data after
10 years of use as you did the first time you
used it.
In addition SeaSPY sensors contain no consumable parts, so you won’t have to replace
anything, like the expensive lamps that wear
out in optically pumped mags.
Proven Sensitivity Specs
Don’t just take our word for
it. We put our sensors under
scrutiny, through rigorous in-
dependent testing by a world
authority belonging to INTERMAGNET. Intermagnet is the global network of observatories, monitoring the Earth’s magnetic field.
Tests confirm our specifications.
Highest Absolute Accuracy
If you want good data you
have to start with the most
than any other magnetometer: 0.1nT ensuring that you are always getting the best possible data.
accurate sensor.
SeaSPY sensors are orders
of magnitude more accurate
Gradiometer Configurations
Our sensors are highly accurate and repeatable, making them ideal
for gradiometers
A gradiometer measures magnetic gradient in one dimension by subtracting the difference
between two independent sensors. Since the Earth’s magnetic field is three dimensional, up to
three independent gradient directions can be measured. For information on how to collect data
in all 3 gradients simultaneously, see our SeaQuest Gradiometer.
All SeaSPY magnetometers are compatible, enabling existing SeaSPY customers to upgrade
their mag to the gradiometer configuration of their choice, as they need to.
Horizontal or Vertical Transverse Gradiometer
Only one tow cable is used to tow this gradiometer. This saves our clients’ money
and valuable deck space. The readings from both mags are also taken simultaneously, improving the accuracy of the gradient calculation. These gradiometers are
well suited for close-in precision surveys, for small ferrous targets where short sensor separation is needed.
Applications
UXO Detection of Small Ferrous Targets – Short baseline gradient
measurement in any direction (longitudinal, horizontal, or vertical) is useful for eliminating geological interference and diurnal variation.
Cable and Pipeline Survey – A horizontal transverse gradiometer can
be used to track cables or pipelines in real time from relatively high
towing altitudes.
Longitudinal Gradiometer
Longitudinal gradiometers provide the largest variation in available baselines, from
1.5m to 500m+. Long baselines provide superior gradient measurement sensitivity
and increased detection range. They are also extremely hydrodynamically stable
when deployed.
Applications
Shipwreck, Search and Salvage – Medium baseline measurement with
a longitudinal gradiometer eliminates interference by geological bodies,
while highlighting massive magnetic sources like steel hulls, boilers or engines. Smaller sources such as anchors or cannons will require a shorter
baseline, and lower towing altitude.
Environmental Survey – Medium baseline measurement with a longitudinal
gradiometer can highlight shallow magnetic sediments, while eliminating deeper geological influences. The baseline should be on the order of magnitude of the
expected towing altitude.
Exploration Geophysics – Long-baseline measurement with a longitudinal gradiometer is ideal since the bodies of interest are often far from the
sensor, and produce very small gradients. The baseline should be on the
order of magnitude of expected depth-to-source.
“We have now completed the first full Antarctic season using our SeaSPY magnetometer
and can report that we are delighted with its performance.
It has proved to be very robust and trouble free in operation and has delivered consistently
good data. There is no doubt that we chose the right instrument.”
Peter Morris
British Antarctic Survey
A SeaSPY Magnetometer
System consists of:
SeaSPY Magnetometer
• Overhauser Sensor
Omnidirectional sensor that does not contain any consumable parts.
• Electronics Module
Contains all of the driving electronics and Larmour counter.
• Leak Detector
A visual queue and alarm sound when even a drop of water
gets inside the mag.
• Depths Available
1000m (1500psi), 3000m (5000psi), 6000m (9000psi)
Tow Cable
The cable is made up of one twisted pair of conductors, a Vectran
strength member, water block and yellow poly-urethane jacket.
Length determined by customer.
Isolation Transceiver
Provides the complete interface between the PC and the mag. It
provides two-way digital communication along the same conductors
that power the mag. It also conditions the mag’s power supply.
Dims: 11 x 6 x 3 cm (4 x 2 x 1") Weight: 130g (0.28 lbs)
Power Supply
Accepts any AC line 48V power, from 100-240VAC and 50/60Hz to
provide conditioned and clean 24V DC power.
Dims: 11x 6 x 3.5cm (4 x 2 x 1") Weight: 165g (0.36 lbs)
Battery Clip Cable
Use this cable instead of the power supply. The mag’s total power
consumption is only 3W. A single 12V car battery
can power it for days.
RS232 Cable
Connects the mag and PC.
BOB
Data acquisition and visualization software.
Reusable Aluminum Shipping Case
Holds all accessories listed above.
Specifications
Performance
Operating Zones NO RESTRICTIONS
SeaSPY will perform exactly according
to spec. throughout the entire range
Absolute Accuracy 0.1nT
Sensor Sensitivity 0.01nT
Counter Sensitivity 0.001nT
Resolution 0.001nT
Dead Zone NONE
Heading Error NONE
Temperature Drift NONE
Power Consumption 1W standby, 3W maximum
Range 18,000nT to 120,000nT
Gradient Tolerance Over 10,000nT/m
Sampling Range 4Hz – 0.1Hz
Communications RS-232, 9600bps
Power Supply 9V-30V or 100-240 VAC
Towfish
Towfish Length 119 cm (47 inches)
Towfish Diameter 7.6 cm (3 inches)
Towfish Weight in Air 12kg (27 lbs)
Towfish Weight in Water 4kg (9 lbs)
Tow Cable
Conductors Twisted pair
Breaking Strength 2,500 kg (5,500 lbs)
Outer Diameter 1 cm (0.4 inches)
Weight in Air 125 g/m (84 lb/1000 ft)
Weight in Water 44 g/m (29.5 lb/1000 ft)
Cable Termination Field Replaceable
Floatation Cable
Outer Diameter 1.9 cm (0.74 inches)
Weight in Air 125 g/m (0.084 lbs/ft)
Weight in Water -20 g/m (0.03 lbs/ft)
Options
•Pressure Sensor
•Altimeter
•Transponder
•Side Scan , ROV & AUV Integrations
•Deck Cable
•Tow Cable Termination Kit
•FreeWheel Wireless Cable Spool
info@marinemagnetics.com
+1 905 479 9727 | marinemagnetics.com
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