Electrical eddy current testing - mixing measurement signals at different frequencies in neural network

摘要

The method involves detecting measurement signals at different measurement frequencies and dependent on the complex impedance of a measurement circuit contg. at least one measurement coil (4a,4b). The measurement signals are processed in a neural network (16) to form a mixed signal (m). The neural network may contain at least one intermediate plane. It may contain a single intermediate plane with two or more processing elements. USE/ADVANTAGE - Enables a mixed signal composed of multiple frequencies to be produced with improved indication characteristics and easier interpretation.