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Magnetometer Cone (MagCone)

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Magnetometer

A magnetometer is a scientific instrument used to measure the strength and/or direction of the magnetic field. The Earth’s magnetic field (the so magnetosphere) varies from place to place, for various reasons such as inhomogeneity of rocks and the interaction between charged particles from the Sun and the magnetosphere. A mass of ferromagnetic material creates a detectable disturbance in this magnetic field. This magnetic anomaly produces a weak, alternating magnetic field that is picked up by the magnetometer, amplified electronically, and fed to the CPT-Logger and subsequently recorded on a computer. Gouda Geo-Equipment is specialized in the manufacturing of these essential products.

Magnetometers are typically used in ground-based electromagnetic geophysical surveys (such as magnetotellurics and magnetic surveys) to assist with detecting mineralization and corresponding geological structures and the detection of buried or submerged objects.

Use our specialized equipment for your next job

If you are interested in using our magnetometer for your specialist job, please do not hesitate to contact us by either calling (0)715 318 475 or sending an email to info@gouda-geo.com. Gouda Geo-Equipment is available 24/7. Therefore, you can always count on our team of experience professionals to help you out with selecting suitable materials for your next job or soil investigation.

The magnetometer can either be equipped with a dummy tip or mounted on top of a P15CFPTxy piezocone made of a high-grade, non-magnetic steel. Due to its high strength and small diameter (44 mm), the MagCone is a penetrometer that is capable of penetrating soils up to greater depths with relative ease. The MagCone can, in the configuration with the piezocone, also collect CPTu data, such as cone tip resistance (qc), lateral sleeve friction (fs) and in-situ pore pressure (p) needed to produce soil profiles and pile designs simultaneously in one operation. This saves the cost of running two operations.

The MagCone and piezocone share the same CPT sounding cable for data transmission to the surface and fit directly on the CPT-Logger data acquisition unit. The CPT-Explorer data acquisition software fully supports the magnetometer and produces magnetometer test results graphed against depth in an Excel-format for further processing. The MagCone allows for triaxial magnetometer testing for magnetic anomaly modelling. The magnetic field is measured in three orthogonal directions and a resultant is calculated as well. Furthermore, the gradient of the resultant will be calculated, which gives a much better indication of changes in the magnetic field.

As the magnetometer survey begins, the module containing the tri-axial magnetometer and, if mounted, the P15CFPTxy piezocone is pushed into the ground by means of a CPT penetrometer rig. The MagCone can detect magnetic anomalies up to 2 m away laterally so that each probe position clears a vertical cylinder of land up to 4m diameter. The MagCone magnetometer generates data from all three directions and transmits these signals separately to surface so that the anomalies can be fully modelled using geophysical software to define the source and character of any anomaly. If your magnetic cone needs to be calibrated, you can count on us for a careful cone calibration.

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