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Acoustic Emission Probe for Power Line Structure Diagnostic Systems

The authors developed an acoustic emission probe (AEP), an electromagnetic converter using solid element inertia, to measure low-frequency dynamic processes based on a new operating principle. This probe lacks the excitation coil and uses a cylindrical electrode that is commonly used by capacitance couplers for excitation. This electrode together with the metering coils for an electrode-inductance vibration sensor with capacity coupling. The functional elements of the AEP form a four-arm measuring bridge that uses capacitors as auxiliary bridge arms. These are integral components of the probe, which assures high invariance against destabilizing factors. The resonance operation mode of the electric circuits of the bridge AEP provides the maximum voltage on the metering coils along with minimum operating currents, which ultimately results in the high responsivity of the suggested AEP design in general. The lack of ferromagnetic circuits, magnetized structural elements, and the quarter-phase transformation of the data signal assure the required level of interference protection. The authors provide a theoretical justification of the operability and efficiency of the suggested AEP along with a hardware implementation option. The authors give a generic layout of a monitoring system for the integrity of power line pylons using the AEP developed.