DC potential drop technique for crack length measurement
Leo K Pushparaj, Khalid M Ebadulla, Abdul Malik Khan, Ramasubbu Sunder, CS Venkatesh · Institutional Repository @ NAL (University of Southampton) · 1989
This. document describes an automated method for crack length measurement. One of the promising methods studied practically was the DC Potential Drop technique for crack length measurement. The possibility of using a pu1sed DC13; method was investigated, whereby a strong current would be pulsed across the specimen and the potential drop measured. This involved the development of instrumentation for generation of constant current pulses and precision measurement of voltages in the microvolts range. The effort also includes suitable interfacing with a Z80 Microprocessor to enable programmable DCPD measurements.