Cesium Vapor Magnetometer - A Professional Magnetic
Mapping System for High Resolution & Rapid Surveys
G-858 MagMapper uses a graphical interface to make survey
design and data acquisition quick and efficient. Various
modes of operation allow the user to custom design a
survey grid for their particular needs. The operator also
has the ability to view his/her position on the grid and
the current data profile during the survey. Sensitivity,
resolution, and recording rate of the cesium magnetometer
are user selectable.
G-858 data acquisition offers either continuous or
discrete station recording. The high sampling rate of the
instrument in continuous mode allows the operator to
survey an area at a fast walking pace. A wider search
radius can be achieved by using a gradiometer
configuration. As a result, over-all costs are inherently
lower while data quality remains high.
The G-858 is designed to interface easily with
standard computers and peripherals.
The G-858 MagMapper system comprises a belt-mounted
display/logging console connected to a cesium sensor
mounted on a hand-held counterbalanced staff. The console
contains electronics to acquire magnetic field data with
position and display it on an LCD screen for review and
edit. The console stores high volumes of data in memory.
Following the survey the data is transmitted at high
speed to a processing computer for detailed analysis.
||A basic software package - MagMap, is supplied as an
integral part of the G-858 system. It provides:
- Transfer of the raw data to the client PC;
- Standard corrections for position errors,
transients, and time varying errors (diurnal);
- Repositioning, linear interpolation and format
corrected data into X,Y,Z ASCII columnar values
for use with various contouring programs.
- Parsing of GPS data to magnetic data set
being used in gradiometer mode
- Our recently developed maximum likelihood dipole
pattern matching software MagAIDTM
allows the user to generate estimations of object
x-y position, size and depth.
- Using the supplied RS-232 port, the G-858 is able
to interface to customer supplied GPS (Global
Positioning System) or other data source.
- A gradiometer configuration (either horizontal or
vertical) is available with the addition of a
second cesium sensor and staff attachments.
- High Sensitivity - Easily detect
a single drum buried 6 meters
- Very Fast - Cover two acres per
hour at 2 meter line spacing.
- Immediate User Feedback -
Display Earth's field survey grid, position and 5
stacked survey profiles.
- Easy to Use - Produce hard copy
maps at base site within minutes using standard
IBM-compatible computers and peripherals.
- Options - Simultaneous vertical
or horizontal gradiometer, Differential GPS
positioning, Target analysis software.
Self-oscillating split-beam Cesium Vapor (non-radioactive
Cs133) with automatic hemisphere switching.
Error: +/- 1 nT
17,000nT to 100,000 nT
500nT / inch; >20,000nT / meter
Operating Zones: For
highest signal-to-noise ratio, the sensor long axis
should be oriented at 45o, +/- 30o
to the earth's field angle, but operation will continue
through 45o, +/- 35o.
Nonvolatile RAM with capacity for 8 hrs. of Magnetometer
time, event marks, field notes, location, or 3 hrs. of
Gradiometer and GPS at maximum sample rates.
Sensitivity: 90% of all
readings will fall within the following Peak-to-Peak
- 0.05nT at 0.1 sec cycle
- 0.03nT at 0.2 sec cycle
- 0.02nT at 0.5 sec cycle
- 0.01nT at 1.0 sec cycle
Visual Display: A
320x200 graphic LCD, daylight visible with selectable
- Data display
- System setup functions
- Survey setup functions
- Survey monitoring
- System diagnostics
Data Output: Three wire
RS-232 standard serial port, optional continuous real
time transmittal of data via RS-232 to PC. Total memory
output transfer time less than 5 minutes at 115,200 baud
- 12 VDC rechargeable gel
cell, 6 hrs. Magnetometer or 3 hrs. Gradiometer
- Internal backup battery for
clock and nonvolatile RAM
-25o C to +50o C (13o F
to +122o F
To 3 ft.
(0.9 m) depth
Shock: Drop 3 ft. on a
hard surface without damage.
Console Magnetic Effect:
Less than 1nT at 4 ft. from sensor.
For more info or pricing contact
Scientific Services, authorized representative for South /