Welcome to Quantum, a periodic e-newsletter for professionals working with magnetic technologies. Quantum is designed to keep you up to speed on applications, case histories, and evolutions of quantum magnetometers in a variety of disciplines.
GEM is seeking case histories from our users regarding magnetometers and their applications to real-world earth science challenges or research projects. Submissions can be very short (two to three paragraphs), preferably with an image of data acquired in the field.
Now is your chance to contribute and inform your fellow earth science professionals about the creative work that you are conducting or interesting projects in which you have been involved.
GEM will enter you in a drawing for a GEM Golf Shirt (1 shirt per newsletter issue). Odds of winning are good, so please consider contacting us at firstname.lastname@example.org with your submission!
GEM is pleased to offer the longest warranty in the geophysical instrumentation industry as a demonstration of its confidence in the quality of its products. All GEM products are waranteed to the original purchaser against defective parts and workmanship for two (2) years from the date of original shipping. A summary document of the precise TERMS and CONDITIONS is provided at http://www.gemsys.ca/GEM_warranty_card.htm
As part of its customer service program, GEM recently implemented an Online Maintenance capability for all customers using its magnetometers. Click the link above and you will also see a series of entry fields at the bottom of the form. Simply complete the form and submit and your warranty will be forwarded directly to us.
Then, you will be all ready for any updates that GEM prepares – a timely way to acquire new and upgraded features via the Internet.
With the increased activity in airborne geophysics, earth science professionals are seeking solutions for acquiring high-quality helicopter airborne data at minimal cost. GEM is pleased to be able to offer such as solution based on its optically pumped Potassium technology.
Main benefits include:
The system can also be adapted to fixed-wing aircraft. For details on the helicopter system, click here.
The following section provides a short summary of useful / interesting links related to archaeology.
GEM recently delivered a technical paper at the Society of Exploration Geophysicists’ meeting in Denver. This paper describes the state-of-the-art in (electro) magnetic measurements for earthquake research. Existing methods have met with limited success due to limited sensitivity and long-term stability of instruments; imperfect elimination of environmental noise; and in the case of induction coils, to limited low frequency features and the skin effect for their bandwidth of measurements.
We also analyze dipolar magnetic fields and gradients of magnetic moments generated by earthquakes with emphasis on their strongly local character. The magnetic moments of two measured precursors are calculated as well as the maximum distances at which those earthquakes can be detected with both present methods and a new proposed method (i.e. short base Potassium gradiometer).
Due to the extreme sensitivity of the Potassium SuperGradiometer, the new method is at least one order of magnitude more sensitive than presently used induction coils. SuperGrad features and installations are described. To access your copy of the slides for the presentation, click here.
Increasingly, explorationists are seeking to use multiple combinations of sensors for performing more complex and comprehensive magnetometer and gradiometer surveys. This demand is based on recognition of a number of factors, including:
The following image shows one platform used by a major mining company for base metal exploration and detection of pre-existing iron well-heads under a lake.
The system employed 4 sensors recording data to a GSM-19 rover unit. GPS information was recorded separately in this application and then merged.
The United States Geological Survey has initiated what is referred to as the USGS Geomagnetism Program. The most important product of this program is a time series record of stable magnetometer data having high accuracy and resolution. These requirements are key reasons that the USGS is upgrading their systems to GEM Overhauser magnetometer (GSM-90 EUROMAG) products.
For a description of how the USGS collects, transports, processes, manages and disseminates magnetic results, select http://geomag.usgs.gov/operations.html. To access a talk that was delivered in Mexico in October 2004 outlining the USGS’ Personal Computer Data Collection Platform, click here.
The multi-sensor unexploded ordnance (UXO) detection system (MUDS) developed by Geophysical Solutions, Inc. simultaneously deploys both the GEM Advanced Magnetometer’s GSMP-40 optically-pumped Potassium vapor magnetometer and the Geonics EM-63 electromagnetic system in very close proximity (1.5 meters) to one another. The system is tracked with the receiver a high precision (sub decimeter) real-time GPS positioning system and all data are monitored with a real-time data acquisition system. Data from the electromagnetic, magnetic, and positioning systems are recorded with a laptop computer in real-time, and available on a visual display as profile data plots, and tracking using a map-type display.
The MUDS was developed by Geophysical Solutions to simultaneously collect geophysical sensor data expressly for the detection of UXO. The MUDS is capable of quickly detecting and precisely locating both surface and subsurface UXO and will increase the safety and efficiency of characterizing UXO contaminated sites. All components can easily be containerized for shipment by standard couriers and rapidly deployed to extremely hazardous sites on an emergency response basis with a minimum of personnel.
The MUDS is equipped with a real-time data visualization and sensor tracking system that incorporates interactive navigation and field survey design capabilities. All geophysical sensor data is collected at essentially the same time and position to increase the probability of discriminating individual UXO targets.
This innovative approach of collecting magnetic and electromagnetic data concurrently at small sensor separation is a significant advancement over other systems currently deployed. The NavCom SF-2050M is currently being deployed to track each sensor and re-acquire anomaly positions. The NavCom receiver uses the StarFire satellite-based augmentation system (SBAS) to obtain sub decimeter accuracies or sub-centimeter accuracies using real-time kinematic corrections.
Field testing of the platform and sensors took place at two locations near Albuquerque, New Mexico, and at the U.S. Army Corps of Engineers UXO test bed in Vicksburg, Mississippi. The instrument platform proved to be robust in these field-scale tests, and the value of multi-sensor datasets was apparent upon analyses of these data.
As part of our service to our customers, GEM regularly performs searches on the Internet to familiarize our clients with the latest developments in magnetics (regardless of Magnetometer supplier). Here are some of our recent results:
GPS has become a much-desired and valued capability among magnetometer users. For users operating stationary observation systems, the key value is the GPS time value used to synchronize the magnetometer. For users of mobile magnetometers and gradiometers, position information (in 3D) is also important.
GEM has recently implemented new capabilities designed primarily for mobile magnetometers. Enhancements include:
For operators who are working outside of the SBAS network (i.e. in the far North or South), the resolution for single point readings is 5m (Circular Error of Probability)
The following are short-form notes describing typical issues to consider before carrying out a field survey. They were written by Dr. Francis Jones, University of British Columbia and have been used with permission of the author.
1. Is the Target Detectable?
2. Search Pattern
3. Consider Noise and Error Sources
As an example, imagine your task is to locate the buried pipes under small flat field. Here some issues to consider:
GEM is pleased to report that its Research and Development group has recently completed an upgrade of the CPU, analog board, backplane board and LCD. The upgrade delivers a number of benefits to users:
The v6.0 upgrade is available for new purchasers. Existing purchasers will not be able to upgrade as entirely new components are required.
As usual, we leave the last word to our customers – our key focus in ensuring that we continue to serve the market effectively and to our customers’ satisfaction.
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Copyright 2005. GEM Systems, Inc. Advanced Magnetometers. All rights reserved with the exception of organizations that have contributed links to this issue. Our thanks to the contributors who have made this edition possible, and who are identified in the text of related articles or through their company websites. Note that some quotes relating to industry-specific trends may have been obtained from public-domain sources, and are not intended to promote GEM Systems, Inc. Other examples may not necessarily reflect GEM products; rather these examples are intended to illustrate the use of magnetics and magnetometry for selected applications.
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