Table 6 Maximum amplitude and frequency range of the different laboratory conditions before the drilling trials.

From: A smart look at monitoring while drilling (MWD) and optimizing using acoustic emission technique (AET)

Signal recording mode

Maximum signal amplitude (dB)

Signal frequency range (Hz)

Laboratory environment

− 73

0–200

Cooling fluid

− 73

0–1200

Drilling machine

− 53

0–1500

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