NovEM 3-axis EM System
Novaminex is developing a number of devices and processing methods aimed at making high quality EM surveys more practical for array-style application. While IP-Resistivity surveys evolved from small dipole count fixed arrays along profiles to full 3D arrays about 20 years ago the same has not happened for EM. The main reason for this is the cost of the sensors at $50,000 + for a low-noise EM sensor set as compared to ~$100 for electrodes and a preamp. The NovaEM project aims to make array EM more practical by designing a low-noise 3-axis EM sensor assembly, the orthoPod, that is easy to deploy and can be made at a small fraction of the cost of devices of similar performance.
Good quality 3-axis EM requires accurate knowledge of the orientation of the individual components of the sensor set. Determining accurate azimuth can be particularly difficult in areas of high magnetic variability. Novaminex is developing the companion Arrow tool. The stand-alone hand-held device is used to measure the absolute orientation of the orthoPod to allow the data to be accurately “rotated” to the Cardinal directions.