GSMP-30A Potassium "SuperSenser"
Magnetometer / Gradiometer Airborne System
Potassium
"SuperSenser" is the most advanced airborne sensor on
the market today.
To address industry requirements, Terraplus introduced "SuperSenser"
- the highest resolution magnetometer / gradiometer
airborne system available.
The SuperSenser (GSMP-30A) is based on a unique
optically pumped Potassium sensor - a technology that
offers an order-of magnitude increase in resolution over
other systems. It also provides:
- Reduced "heading" errors
- Highest absolute accuracy
- Decreased maintenance costs
It offers a number of benefits for fixed wing and towed
survey configurations, including:
- Highest sensitivity (i.e. highest
signal-to-noise) for enhanced resolution of
geological and cultural features in a variety of
applications.
- Highest absolute accuracy (varying by no more
than +/- 0.1 nT between sensors)
- Negligible orientation (heading) errors
- Faster sampling
- Insensitivity to microphonics
- Lowest maintenance (no re-alignments)
As well, Terraplus offers advanced base station
capabilities, such as:
- Potassium & Overhauser
- 3 modes for flexible base station scheduling
- GPS option for precise time synchronization with
onboard GPS
The worldwide application of airborne magnetic and
gradiometric data is growing -- driven by the increasing
demand for high-resolution, low cost data to:
- Map targets, geology and geological structures
in mineral exploration
- Perform frontier evaluation and augment seismic
data in hydrocarbon exploration
- Detect Unexploded Ordnance (UXO)
- Map pipelines and other cultural objects in
environmental and engineering investigations
Key Components
The SuperSenser technology comprises:
- Sensor head
- Radio Frequency (RF) pre-amplifier and drive
electronics module
- Cable (1 to 10m - standard 4m) to separate
sensor and electronics for noise elimination
- Optional signal processor / console and cable
 Optically
pumped Potassium SuperSenser (GSMP-30A) sensor and
cable. Can also be configured with additional sensors
for Gradiometer readings
The sensor deploys as a single unit, or in
combination with other sensors for magnetic gradient
measurements.
The GSMP-30 can also be deployed in a multi-sensor
configuration for gradient and total field magnetic
measurements. As shown above, four Potassium units can
be installed in a special “bird” with two fins at the
tips of an imaginary tetrahedron to allow for
measurement of Total Magnetic Field and the gradients in
three directions:
- Vertical gradient
- Horizontal gradient (along-the-track)]
- Horizontal gradient (across-the-track)
Horizontal gradient measurements are increasingly
popular for providing details about the lateral extent
of subsurface anomalies located between survey lines.
Vertical gradients can assist significantly in
identifying geologic / structural contacts and
near-surface targets (such as UXO).
In the example above (main pictures above), we show
the system deployed in a fixed wing “stinger”
implementation for acquisition of high resolution Total
Magnetic Field data.
Implementing your solutions
 The
GSMP-30A system can be interfaced either to the signal
processing console which provides 32 MBytes of memory
for data acquisition, or to other recorders and data
acquisition systems. We can provide technicians to
facilitate set up for:
- Installation assistance for "fixed-wing" or
"stinger" configurations
- Custom "bird" design and development for "towed"
configurations
- Conversion of output voltages into corresponding
frequency and magnetic field values
- Electronics interfacing to on-board recording
and navigation systems
Airborne Base Station Configurations
Another area of application for advanced magnetometers
is in airborne base station monitoring. Our customers
have the choice of working with GSMP-30A or
Overhauser (GSM-19) units.
The GSMP-30A implementation offers advantages for
surveys where very high resolution diurnal corrections
are needed.
GSM-19 also delivers good resolution and economical
pricing.
Both implementations share a number of advanced features
(introduced in version 6.0 firmware release), including:
- Precise time synchronization of field and base
station units using a built-in GPS option. This
capability is particularly important for working in
noisy magnetic conditions and provides the highest
accuracy possible.
- Flexible scheduling (up to 30 on / off periods).
Simply define a series of intervals and the base
station will turn itself on as you need. This mode
provides the greatest flexibility for longer surveys
where leaving your base station on increases
efficiency. Immediate start and daily modes are also
provided.
Benefiting from the Natural Properties
of Potassium Optical Pumping
With more than a decade of experience with Potassium
technologies, we feel confident that your next survey
will benefit in many ways, including acquisition of:
- Highest sensitivity data (reflecting Potassium
spectrum characteristics and high natural frequency
of 7 Hz/nT)
- Highest absolute accuracy (a variation of only
+/- 0.1 nT between sensors makes the GSMP-30A an
ideal choice for gradiometer installations)
- Data with minimal heading errors (reflecting the
insensitivity of Potassium to aircraft / bird
orientation)]
- Data that is not affected by phonics (low
frequency vibration in the audio range)
Maintenance costs are minimal in comparison with other
systems as key components can be replaced in the field.
SuperSenser Specifications
Performance
| Sensitivity: |
|
0.001 nT @ 20 readings / sec |
| Resolution: |
|
0.0001 nT |
| Absolute Accuracy: |
|
+/- 0.1 nT |
| Dynamic Range: |
|
10,000 to 120,000 nT |
| Gradient Tolerance: |
|
Over 2000 nT/m |
| Sampling Rate: |
|
up to 20 readings / sec |
Orientation
| Sensor Angle: |
|
Optimum angle 30° between sensor
head axis & field vector. |
| Orientation: |
|
10° to 80° & 100° to 170° |
| Heading Error: |
|
< 0.1 nT between 10° to 80° and
360° full rotation about axis. |
Dimensions & Weights
| Sensor: |
|
89mm diameter. x 152mm length,
and < 1.3 kg |
| Pre-amplifier: |
|
30.6cm x 8.5cm x 7.5cm, and 1.6
kg |
Power
| Power Supply: |
|
18 to 35 V DC |
| Power Requirements: |
|
Approx. 25 W at start up,
dropping to 8 W after warm-up |
| Power Consumption: |
|
8 W typical at 20°C |
| Warm-up Time: |
|
<15 minutes @ -40°C |
Environmental
| Operating Temperature: |
|
-40°C to +55°C |
| Storage Temperature: |
|
-70°C to +55°C |
| Humidity: |
|
0 to 100%, splashproof |
Outputs
Cycled measurements of the Total Magnetic Field with
position & time as digital readout or graph form on the
console or as ASCII format through an RS-232 COM port.
Pre-amplifier outputs are continuous signals at the
Potassium Larmor frequency which is proportional to the
magnetic field (7 Hz/nT).
Components
Sensor, pre-amplifier box, 4m sensor / pre-amplifier
cable, manual & ship case.
Optional pre-amplifier to signal processor cable (1.0 to
100.0m)
Ordering Information
|
Description |
|
Order
Number |
| GSMP-30A |
|
28MAR02-CDN-MS |
|
