| |
| SMARTRAK Underwater
Pipeline and Cable Locating System |
|
SMARTRAK is
a new family of lightweight pipeline & cable trackers from Innovatum-UK
& SubSurface. Smartrak is designed to be small and lighter than existing cable
and pipeline trackers to allow it to be mounted on modern small vehicles. Smartrak
is capable of tracking Passive Magnetic, Active AC (tone) and Active DC modes.
Smartrak is design with the user in mind with the automatic calibrations validations
and easy to use software
|
| System Information |
|
SMARTRAK is smaller, lighter,
simpler to operate and cheaper than previous tracking products from Innovatum-UK
& SubSurface, whilst still offering
tracking in Passive Magnetic, Active AC (Tone) and Active DC modes
SMARTRAK can be fitted onto modern small vehicles which
have not previously been capable of performing tracking tasks, due to the
low weights, small sizes and low power consumption.
SMARTRAK uses new software, with automated calibration
procedures giving simpler operation than previous magnetic systems
SMARTRAK is supplied complete with a “Tritech” altimeter.
SMARTRAK is supplied in a single protective case, complete
with laptop computer, software and manuals, all cables and a spare sensor
|
|
| Theory of Operation |
Passive Magnetic Code
An array of vertically mounted magnetic gradiometers is use to collect magnetic
field gradient information. The change in field gradient near to the target
is caused by either the intrinsic magnetism of the target or the effect of
the permeable material in the target "bending" the field of the earth. The
local terrestrial field effects are mathematically removed, and the field gradients
resolved to produce a two-dimensional target position. A tri-axial fluxgate
sensor, which may be part of one of the gradiometer instruments, is used to
provide heading information, and this combined with the known heading of the
target is used to adjust the calculations for angular offsets and to produce
the tracking display. Passive Magnetic Tracking is used for pipeline survey
using the natural field of steel pipes, and for cable survey either by the
weak natural fields of the cable, or a strong field developed by specially
magnetising the cable armour or strength member prior to cable lay. It has
excellent range performance.
Active DC Mode
This method is essentially similar to passive magnetic mode, except the field
gradients are produced by the DC current flowing in the cable or pipe.
Fields produced by a DC current in this manner are at right angles to the
fields produced by the magnetism of a pipeline. Range is dependant on the
current in the target, varying from <1m at 0.5A to >10m at 500A.
May be used for tracking live HVDC cables, and trans-oceanic telecommunication
cables by tracking the magnetic fields from the repeater drive currents.
Active AC Mode
An array of up to six tri-axial flux gates is used to sense the alternating
magnetic field produced by an unidirectional AC current flowing in the
target cable or pipeline. This current flow MUST have a remote return path.
As the frequency of the AC may be accurately controlled, and the magnetic
field signals may be accurately filtered, highly accurate data may be produced.
Target direction data is also produced, allowing accurate alignment of
cable maintenance vehicles with the target cable. This method of tracking
is primarily used for locating, tracking and surveying cables.
|
|
Performance
| AC Tone Tracking Mode |
System Alone |
System on Vehicle** |
| Detection |
2.5 mA @ 2 metres |
5 mA @ 2 metres |
|
40 mA @ 30 metres |
80 mA @ 30 metres |
| Detection & Direction |
5 mA @ 2 metres |
10 mA @ 2 metres |
| Tracking & Depth (+/-10 cm) |
5 mA @ 1 metre |
10 mA @ 1 metre |
| DC Current Tracking Mode |
| Detection |
0.4A @ 1.5 metre |
0.4A @ 0.75 metre |
|
or 1.6A @ 3 metres |
1.6A @ 1.5 metre |
| Detection & Direction |
0.4A @ 0.75 metre |
0.4A @ 0.5 metre |
|
or 1.6A @ 1.5 metre |
1.6A @ 1 metre |
| Tracking & Depth (+/- 25cm) |
0.4A @ 0.5 metre |
0.4A @ 0.4 metre |
|
or 1.6A @ 1 metre |
1.6A @ 0.8 metre |
Passive Cable***
(Only armoured steel wire can be tracked passively for continuous cable.) |
| Detection |
5 metres |
3 metres |
| Tracking (+/- 25 cm) |
3 metres |
2 metres |
| Tracking & Depth (+/- 25 cm) |
2 metres |
1.5 metres |
Passive Pipe
(Data only normally available for approximately 60% of pipelength) |
| Tracking & Depth (+/-25cm) |
4"dia |
5 metres |
3 metres |
|
16" dia |
8 metres |
6 metres |
|
48" dia |
10 metres |
7 metres |
| ** Vehicle AC noise estimated at 0.2 nanotesla at sensors |
| ** Vehicle DC noise estimated at 20 nanotesla per foot at sensors |
| ***Specifications below are appropriate for single armour type SD cable,
100mm OD) |
| Infield performance may be degraded due to local magnetic disturbances,
vehicle noise, poor installation and incorrect operation |
|
Dimensions & Weights
| Smartrak |
| 1. Sensor Interface Pod (Subsea Unit) |
| Length overall |
|
9.4 inches |
|
24 cms |
| Diameter |
|
7.4 inches |
|
19 cms |
| Weight in air |
|
15.4 lbs |
|
7.0 Kg |
| Weight in seawater |
|
8.3 lbs |
|
3.8 Kg |
| Power requirement |
24 volts DC @ 850mA
or 110VAC |
| 2. Subsea Sensors |
| Length overall |
|
14.1 inches |
|
36 cms |
| Diameter |
|
1.5 inches |
|
4 cms |
| Weight in air |
|
2.4 lbs |
|
1.1 Kg |
| Weight in seawater |
|
0.6 lbs |
|
0.3 Kg |
| Length of cables (standard - others
avalaible on request) |
2 m |
| 3. Echo Sounder |
| Length overall |
|
6.2 inches |
|
16 cms |
| Diameter |
|
1.8 inches |
|
4.7 cms |
| Weight in air |
|
4.0 lbs |
|
1.1 Kg |
| Weight in seawater |
|
3.0 lbs |
|
0.8 Kg |
| Length of cables (standard - others
avalaible on request) |
2 m |
| 4. Workstation |
| As per Dell specification for Inspiron 1300 |
|