GEM has had a long and storied history – starting as Geophysical Electromagnetic Systems, a consulting partnership. The company incorporated in 1980 as GEM Systems, and is now known in industry as GEM Systems. Formed by Drs. Ivan and Jasna Hrvoic, the company continues to be managed by Dr. Ivan Hrvoic who contributes many years of experience in geophysical instrumentation and electronic design. In the late 1960’s and early 1970’s, Dr. Hrvoic worked as Senior Research Engineer with Scintrex Ltd. During this time, initial research was conducted into the feasibility and design of a Continuous Reading High Sensitivity Airborne Overhauser Magnetometer. As the company’s reputation as a proven supplier of instrumentation for total field measurement grew, they branched into other fields, including the observatory field. Today, Overhauser magnetometers have replaced many of the conventional Proton Precession observatory installations around the world.
In the late 1960’s and early 1970’s, Dr. Hrvoic worked as Senior Research Engineer with Scintrex Ltd. During this time, initial research was conducted into the feasibility and design of a Continuous Reading High Sensitivity Airborne Overhauser Magnetometer.
This work was completed in 1983 through a research grant and led to the first of an innovative series of magnetometer/gradiometer technologies featuring three main physical principles – Proton quantum magnetometer, Overhauser quantum magnetometer, and the optically pumped Potassium quantum magnetometer.
A History of Innovation GEM celebrated 35 years leading the world of Magnetics in 2015
Commercial success of the GSM-8 Proton Precession magnetometer led to early expansion and creation of the GSM-9 Overhauser, the first pulsed Overhauser magnetometer and the GSM-19 Overhauser memory magnetometer – a joint research effort with Lamontagne Geophysics. GSM-10 and 18 magnetometers were also developed and were received well in the resource exploration market.
The company also developed solutions for other fields, such as UXO, volcanology, earthquake prediction, and engineering and environmental disciplines.
Following expansion in 1987, the company launched the GSM-19. This memory magnetometer combines Overhauser technology with proprietary free-radical solutions and firmware that is also able to accept other geophysical methods such as VLF and multiple gradiometer channels. GEM’s team of engineers have now re-packaged the system and enhanced cycle times while establishing industry benchmarks for low weight, low power consumption and high sensitivity.
The Overhauser and Proton magnetometers/gradiometers continued to see success as they moved into later versions, most notably Version 7 which saw many key design and technical enhancements. These magnetometers continue to be developed – even today – justified by their performance and general acceptance in the earth sciences and other subsurface investigations.
In parallel, GEM has initiated a number of research programs designed to provide even more powerful systems for a growing stable of clients around the world. One of these was the implementation of the Potassium magnetometer in conjunction with a Russian research institution. This magnetometer and its superior sensitivity of 0.0003 nT and other features is proving to be one of the most advanced and effective in the world – delivering a new milestone in data quality that surpasses even Overhauser and Proton instruments as well as competing optically pumped cesium magnetometers.