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Data Quality

The QMax EM3 (QMax) is the only 6-channel ocean-bottom EM receiver (Ex, Ey, Ez, Bx, By, Bz) currently available. This fully-integrated receiver acquires horizontal electric and magnetic field data on a one meter baseline with a signal-to-noise ratio (SNR) equal to or better than the traditional silver/silver-chloride based technology currently in use, which requires an E-field baseline upwards of 10 meters. Furthermore, QMax vertical E-field data are equivalent to its horizontal E and vertical B-field data are comparable to its horizontal B. The QMax EM3 also provides advanced accuracy, data consistency and reliability, in addition to offering the following advantages compared to traditional technologies:

  1. Most comprehensive data sets with the inclusion of vertical E and B sensors (this simplifies data rotation and can allow for better discrimination of the edges of structures)
  2. Best E-field signal-to-noise ratio (eliminates the needs for arms and provides better depth and resolution imaging)
  3. Greatest consistency (no E-field orthogonality errors, greater seafloor stability, no chemical/ion exchange required to couple with seawater, greater drop accuracy, commercial grade reliability)

Data Accuracy – SNR & Beyond

QuasarGeo's breakthrough E-field sensors (quiet electrodes combined with ultra-low noise electronics) and compact magnetic coils have been integrated with a platform designed to optimize data accuracy and survey speed. See operational efficiencies for details about deployment/recovery/turnaround advantages.

Our advanced E-field sensors enable the elimination of long E-field arms. The benefits include 1) greater safety, 2) less surface area, which can improve drop accuracy (further improved by a faster drop time due to less time in the water column) and ocean floor stability (further improved by the hydrodynamic package), 3) guaranteed orthogonal E-field baseline / electrode placement, 4) reduced signal variance caused by cables, and 5) decreased drop/rise time which increases deployment/recovery/turnaround speed allowing for more data points for the same mobilization. Arms can be added on a case-by-case basis to further improve SNR, which scales with length. For example, adding 10 meter arms would improve SNR by an order of magnitude.

Reliability and data consistency are important factors often overlooked when assessing underwater receivers. The QMax's guaranteed orthogonal E-field baseline reduces variance in data acquisition and thus resulting error in the model, while its greater seafloor stability reduces noise in B-field data. QuasarGeo's proprietary capacitive electrodes are inert and therefore do not couple to the seawater through a chemical/ion exchange, which eliminates another point of variance. They also have a longer performance lifetime and lower maintenance burden than current industry standard silver/silver-chloride electrodes, which means they are less likely to fail during data collection. Reliability is maximized through permanent installation of electrodes and magnetic coils (fewer connectors which are a common point of failure) and an on-deck, remote functionality check that allows users to verify that the units are working properly shortly before deploying them is available to further ensure quality data acquisition on all 6 channels.

Companies choosing QuasarGeo powered surveys can be confident the data acquired are the most comprehensive and highest resolution survey data available in today's market.