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Overhauser Magnetometers

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The “Walking” and “Mobile”  Overhauser magnetometers can provide additional survey capability by simply adding a sensor for gradiometer data. In addition all systems can be combined with a VLF to provide shallow resistivity for efficient 3 parameter surveys.

All systems are backed by our industry-leading three year warranty.

There are two primary systems for consideration.

1. High sensitivity, nearly continuous surveys

Overhauser “Walking” system is your most logical choice.

2. High sensitivity, discrete surveys

Overhauser “Mobile” system is your most logical choice.

For all magnetic surveys a base station magnetometer is required to correct for (subtract) the normal daily fluctuations in the magnetic field.

Overhauser “Base Station”

a) Overhauser “Walking” Magnetometer/Gradiometer

A walking magnetometer/gradiometer is a high-sampling system capable of acquiring nearly continuous data. Key features are related to data quality, cost control and productivity as follows:

  • 0.022 nT @ 1 hz sensitivity for high sensitivity data acquisition
  • 5 samples per second acquisition for higher productivity (either by operator or on towed vehicles) and more data for decision-making
  • Ergonomic backpack and hands-free operation for greater operator ease-of-use and productivity



b)Overhauser “Mobile” Magnetometer/Gradiometer

GEM_GSM 19G

A mobile magnetometer/gradiometer is a high sensitivity system capable of acquiring data at discrete stations. Key features are related to data quality, cost control and productivity as follows:

  • 0.022 pt/ÖHz sensitivity for high sensitivity data acquisition
  • Discrete data acquisition with sensor staff for routine application in various types of environments and terrains
  • All of the other features of “Walking” Overhauser magnetometers, including low weight for highly efficient operator functioning

TOPc) Overhauser “Base” Magnetometer

Overhauser Base Station

A base magnetometer is a high sensitivity system capable of acquiring data at a regular interval throughout the day. Depending on the sampling requirements, it can be either a Fast sampling unit taking 5 samples per second (up to 5 Hz) or a Standard unit sampling at one sample every 3 seconds  (up to 0.33 Hz). Key features are related to data quality, cost control and productivity as follows:

  • The Overhauser base magnetometer has a high absolute accuracy. GEM is the global standard in Observatory magnetometers for this reason; the base magnetometer produces highly repeatable data as required in industry.
  • Three Base station programming modes are available for maximum productivity. These include daily (define working hours and minutes each day); flexible (up to 30 on/off periods) and immediate start.

Using either daily or flexible modes means that the operator is not required to return to the base station each day; data can be acquired with maximum efficiency and stored in high volume memory.

To download the brochure;

GEM GSM19 Overhauser Brochure

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