Extraction of an A.C. Micro-Volt Signal from a Corrosion Fatigue Specimen using Opto-Isolator and off-Set Voltage Circuitry

Abstract

A technique is described by which current transients induced by fatigue can be monitored from test-pieces cyclically stressed in aqueous environments. The signal is extracted for oscilloscope display using an optoisolation technique. Facilities are also provided for automatic recording.