GSMP-30 PORTABLE POTASSIUM MAGNETOMETER / GRADIOMETER

     The GEM Systems GSMP-30 is a high sensitivity potassium magnetometer and gradiometer system, providing unmatched sensitivity and absolute accuracy, in addition to near zero orientation or heading error effect.
     The GSMP-30 operates on principles similar to other alkali vapor magnetometers such as the Cesium magnetometer, but benefits from the unique nuclear properties of Potassium. While Cesium spectral lines are lumped together, Potassium narrow lines are well separated offering superior sensitivity and absolute accuracy.

GSMP-30 Advantages
• Insensitivity to orientation - virtually zero heading error result from the nuclear properties of potassium does not introduce orientation “noise” into the magnetic or magnetic gradient measurement and as a result, high system sensitivity can be realized in both dynamic and static environments.
• Sensitivity - inherent potential sensitivity results from the nuclear properties of potassium. The very narrow spectral lines of potassium provide sensitivities that are the highest among all optically pumped magnetometers.
• Absolute accuracy - the GSMP-30’s unmatched absolute accuracy (a variance of only ± 0.1 NT between any GSMP-30 sensors) makes this sensor the best choice for all gradiometer installations.
• No regular calibrations, GSMP-30 sensors do not require periodic calibration as the relative position of the RF depolarization coil and the optical axis, does not impact performance.

Applications
The long term stability, high sensitivity and fast response to the changing magnetic field make the GSMP-30 ideal for a wide variety of applications, such as:
• Ferrous ordnance location - for the detection of ordnance and mines by portable methods.
• Ground portable magnetic and magnetic gradient surveying - for archaeological searches, engineering applications for detection of buried drums containing hazardous wastes and mineral and oil exploration.
• Base station magnetic monitoring - for observing diurnal magnetic activity and disturbances
• Long term monitoring at magnetic observatories, earthquake predictions, monitoring of volcanic activities etc.

GSMP-30 console


The GSMP-30 console is equipped with
a graphic display and a 16 key alphanumeric keyboard.

GSMP-30 High Sensitivity Potassium Magnetometer Sensor Assembly

The lightweight (less than 2.9 lbs) GSMP-30 sensor head houses the electro-optical detection system.
All components of the sensor head, including the outside plastic housing, are made of carefully screened, nonmagnetic materials.

Universal Gradiometer Staff

“Walking” Magnetometer / Gradiometer

GEM Systems pioneered the innovative “Walking” mode that enables acquisition of nearly continuous data on survey lines. The “Walking” mode is a standard feature of every GSMP-30. Similar to an airborne survey in principle, data is recorded at discrete time intervals (up to 10 readings per second) as the instrument travels along the line. At each major survey picket (fiducial), the operator touches a designated key.

Optional GPs Navigation Subsystem
In addition to providing support for a variety of OEM GPs receivers integrated into the GSMP-30 console, a GSMP-30 can accept data from other GPs receivers in NMEA format, a standard which virtually all receivers support. It can store the data for a subsequent post processing for differential GPs thus allowing a one man DGPS surveys. All of the survey navigation features provided with the integrated OEM GPs receiver option are supported with external GPs receivers as well. An important benefit of the OEM GPs receiver is that the magnetic interference generated by the GPs subsystems is shielded from the sensitive magnetometer sensors, by the GSMP-30 chassis.

Some of the GSMP-30 navigation features include:
• real-time coordinate transformation to UTM and local X-Y coordinate rotations
• survey “lane” guidance , with cross-track display and audio indicator
• user selectable (and user defined) datums, such as the commonly utilized WGS-84

Advanced GPs Integration Features
The GSMP-30 data acquisition console offers an unprecedented level of GPs integration, if the console is fitted with an additional 8.0 Mb of FLASH memory for logging GPs raw ranges, and supplied with optional firmware. Similar to standard GSMP-30 firmware, GPs X-Y positions are captured and written along with each magnetometer or gradiometer record. However, the advanced GSMP-30 GPs integration option provides the ability to write raw ranges to a separate file in GSMP-30 memory, for post processing.

In addition, utilizing the outputs of the GPs navigation subsystem, the GSMP-30 firmware carries out special navigation tasks, including survey grid navigation. The GSMP-30 processes the signals received from the GPs navigation receiver, to provide the operator with all the information needed to navigate a survey grid.

Other data that the operator may be interested in, such as the health of the GPs constellation, current position and distance to the next waypoint or end of line is displayed in the GSMP-30’s navigation window.