Abstract: A collection of data processing algorithms which, used in concert, are suitable for use in place of a high pass filter stage in an eddy current inspection system and provide for a system optimized to inspect test pieces for elongated defects running parallel to the scan axis. The algorithms use mathematical techniques to eliminate baseline impedance offset between test pieces, correct for offset drift during a scan, and allow for system balancing using only a set of test pieces of unknown quality.

Abstract: A collection of data processing algorithms which, used in concert, are suitable for use in place of a high pass filter stage in an eddy current inspection system and provide for a system optimized to inspect test pieces for elongated defects running parallel to the scan axis. The algorithms use mathematical techniques to eliminate baseline impedance offset between test pieces, correct for offset drift during a scan, and allow for system balancing using only a set of test pieces of unknown quality.

Abstract: The network comprises a master node and a plurality of slave nodes. To configure the network, the master node transmits over the network a hailing message at any attenuated level compared to normal communication signals to be transmitted over the network. Upon receiving the hailing message at one of the slave node, a reply message is transmitted, also at an attenuated level. Receiving the reply message at the master node allows it to configure the slave node from which the reply message originated. Also disclosed are a method of managing a network so as to monitor the connections between the slave nodes, and a method of managing a network when a recovery operation is required.