Maximising Signal-To-Noise Ratio in Transient EM Data

E048 Maximising Signal-To-Noise Ratio in Transient EM Data A.M. Ziolkowski* (MTEM Ltd) & R. Carson (MTEM Ltd) SUMMARY We describe the multi-transient electromagnetic method and focus on new technology to maximise the signal-to-noise ratio. The amplitude of the transient EM impulse response decays with offset r as 1/r^5. We employ a variety of techniques to maximize the signal: maximizing the input current ; increasing the source bi-pole length proportional to offset r but satisfying the constraint that the length must be less than a quarter of the offset; choosing the order of the PRBS source time function to be large